CN114577592B - Device and method for testing mechanical properties of steel tube concrete truss type mixed structure - Google Patents
Device and method for testing mechanical properties of steel tube concrete truss type mixed structure Download PDFInfo
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- CN114577592B CN114577592B CN202210171072.7A CN202210171072A CN114577592B CN 114577592 B CN114577592 B CN 114577592B CN 202210171072 A CN202210171072 A CN 202210171072A CN 114577592 B CN114577592 B CN 114577592B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 225
- 239000010959 steel Substances 0.000 title claims abstract description 225
- 239000004567 concrete Substances 0.000 title claims abstract description 224
- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 136
- 230000000670 limiting effect Effects 0.000 claims abstract description 23
- 230000007774 longterm Effects 0.000 claims description 40
- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 206010063659 Aversion Diseases 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention relates to the technical field of stress tests of steel tube concrete truss type mixed structures, and provides a device and a method for testing mechanical properties of a steel tube concrete truss type mixed structure. Wherein, the device includes: the axial force load mechanism comprises a first seat body, a second seat body and a first linear driving mechanism, wherein the first linear driving mechanism is respectively connected with the first seat body and the elastic buffer assembly, and two ends of the steel tube concrete truss type mixed structure are respectively connected with the elastic buffer assembly and the second seat body; the lateral force load mechanism comprises a counter-force seat, a second linear driving mechanism and a hoop assembly, the hoop assembly is sleeved outside the steel pipe concrete truss type mixed structure, a first end of the second linear driving mechanism is connected with the counter-force seat, and a second end of the second linear driving mechanism is connected with the hoop assembly; the lateral limiting device is propped against the side wall of the steel pipe concrete truss type mixed structure, and can study the influence of load on the mechanical property of the steel pipe concrete truss type mixed structure on the premise of avoiding the out-of-plane instability of the steel pipe concrete truss type mixed structure.
Description
Technical Field
The invention relates to the technical field of stress tests of steel tube concrete truss type mixed structures, in particular to a device and a method for testing mechanical properties of a steel tube concrete truss type mixed structure.
Background
The steel pipe concrete truss type mixed structure has the advantages of high bearing capacity, strong integrity and the like, and is widely applied to major infrastructure main structures. Because dead weight, external load and the like are born for a long time in the using stage, the steel tube concrete truss type mixed structure can generate structural creep, so that the mechanical property of the steel tube concrete truss type mixed structure can be influenced. Therefore, the research on the influence of the long-term load effect on the structural performance of the steel pipe concrete truss type mixed structure has very important application background.
Disclosure of Invention
The invention provides a device and a method for testing mechanical properties of a concrete-filled steel tube truss type mixed structure, which can apply load to the concrete-filled steel tube truss type mixed structure on the premise of avoiding out-of-plane instability of the concrete-filled steel tube truss type mixed structure so as to conveniently study the influence of the load on the structural properties of the concrete-filled steel tube truss type mixed structure.
The invention provides a steel tube concrete truss type mixed structure mechanical property test device, which comprises:
the axial force load mechanism comprises a first seat body, a second seat body, an elastic buffer assembly and a first linear driving mechanism, wherein the first end of the first linear driving mechanism is connected with the first seat body, the second end of the first linear driving mechanism is connected with the elastic buffer assembly, and two ends of the steel tube concrete truss type mixed structure are respectively connected with the elastic buffer assembly and the second seat body;
The side force loading mechanism comprises a counterforce seat, a second linear driving mechanism and a hoop assembly, wherein the hoop assembly is detachably sleeved on the outer peripheral side of the concrete filled steel tube truss type mixed structure, the first end of the second linear driving mechanism is connected with the counterforce seat, and the second end of the second linear driving mechanism is connected with the hoop assembly;
the lateral limiting device is used for propping against the side wall of the steel tube concrete truss type mixed structure, and the lateral limiting device is arranged on two sides of the steel tube concrete truss type mixed structure.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the invention, the elastic buffer component comprises a disc spring group, a pressure sensor, a connecting shaft and a guide seat;
The second end of the first linear driving mechanism is propped against the first end of the disc spring set, and the second end of the disc spring set is propped against the first end of the connecting shaft through the pressure sensor;
the second end of the connecting shaft slidably penetrates through the guide seat and is hinged to the first end of the steel tube concrete truss type mixed structure, and the second end of the steel tube concrete truss type mixed structure is hinged to the second seat body.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the invention, the hoop component is provided with a positioning groove for placing the chord member of the steel tube concrete truss type mixed structure;
the ferrule assembly is configured as a removable frame structure.
The invention provides a steel tube concrete truss type mixed structure mechanical property test device, which also comprises a hoop assembly and a guide plate, wherein the lateral limiting device comprises a mounting seat and a bullseye bearing;
the hoop component is used for sleeving the chord member of the concrete filled steel tube truss type mixed structure, and the guide plate is connected with the hoop component;
the bullseye bearing is arranged on the mounting seat and abuts against the guide plate;
The two mounting seats which are oppositely arranged on the two sides of the concrete filled steel tube truss type mixed structure are connected through threaded connecting pieces.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the invention, the hoop component comprises two connecting blocks connected through the threaded connecting piece, a groove for placing the chord member of the steel tube concrete truss type mixed structure is arranged between the two connecting blocks, and the guide plate is connected with the connecting blocks.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the invention, the steel tube concrete truss type mixed structure mechanical property test device further comprises a reinforcing seat connected with the hoop component;
The second end of the second linear drive mechanism is coupled to the ferrule assembly via the reinforcement mount.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the invention, the first end of the second linear driving mechanism is hinged with the counterforce seat, the second end of the second linear driving mechanism is hinged with the hoop component, and the hinge axis between the second linear driving mechanism and the hoop component is perpendicular to the expansion direction of the first linear driving mechanism.
The invention provides a steel tube concrete truss type mixed structure mechanical property test device, which also comprises a displacement meter;
The displacement meter is arranged at the second end of the second linear driving mechanism and is used for measuring the displacement of the second end of the second linear driving mechanism.
The invention provides a steel tube concrete truss type mixed structure mechanical property test device, which also comprises a long-term loading device;
The long-term loading device comprises a tension and compression sensor, a connecting rod and a fixing nut, and connecting plates are arranged at two ends of the steel tube concrete truss type mixed structure;
The two ends of the pulling and pressing sensor are connected with the connecting rods, and the two connecting rods respectively penetrate through the two connecting plates and are in threaded fit with the fixing nuts.
The invention also provides a steel tube concrete truss type mixed structure mechanical property test method which is implemented based on the steel tube concrete truss type mixed structure mechanical property test device, and the test method comprises the following steps:
Connecting a long-term loading device with the steel tube concrete truss type mixed structure, applying load along the axial direction of the steel tube concrete truss type mixed structure by utilizing a counter-force seat and a linear driving mechanism, screwing a fixed nut, unloading the linear driving mechanism, and applying load by utilizing the linear driving mechanism and adjusting the tightness of a fixed nut when the value of a tension-compression sensor is determined to not reach a preset load value, until the value of the tension-compression sensor reaches the preset load value after unloading the linear driving mechanism;
connecting the steel tube concrete truss type mixed structure with the axial force loading mechanism after a preset time period;
Applying an axial load to the concrete filled steel tube truss type mixed structure by utilizing the axial force load mechanism, and dismantling the long-term loading device when the axial load applied by the axial force load mechanism is equivalent to the load applied by the long-term loading device;
The steel tube concrete truss type mixed structure is respectively connected with a lateral force loading mechanism and a lateral limiting device;
and applying unidirectional load and/or reciprocating load to the concrete filled steel tube truss type mixed structure by utilizing the lateral force load mechanism.
The steel tube concrete truss type mixed structure mechanical property test device provided by the invention has at least the following functions and advantages:
1. the first linear driving mechanism, the elastic buffer assembly, the first seat body and the second seat body can provide stable axial load for the steel tube concrete truss type mixed structure.
2. The hoop component is sleeved on the outer peripheral side of the steel tube concrete truss type mixed structure, and the hoop component is pulled and pressed through the second linear driving mechanism, so that lateral continuous load or reciprocating load can be provided for the steel tube concrete truss type mixed structure.
3. The lateral limiting device can be used for limiting the lateral direction of the steel tube concrete truss type mixed structure, so that the deformation of the steel tube concrete truss type mixed structure only occurs in a plane defined by axial force and lateral force, and the problem that the steel tube concrete truss type mixed structure is unstable outside the plane is prevented. The steel pipe concrete truss type mixed structure mechanical property test device can provide axial load and lateral load for the steel pipe concrete truss type mixed structure on the premise of avoiding out-of-plane instability of the steel pipe concrete truss type mixed structure so as to conveniently study the influence of the load on the steel pipe concrete truss type mixed structure mechanical property.
4. The steel tube concrete truss type mixed structure mechanical property test device can replace or simulate long-term axial load through the first linear driving mechanism, and can provide continuous or reciprocating lateral load for the steel tube concrete truss type mixed structure through the lateral force loading mechanism in the process of providing equivalent long-term axial load through the axial force loading mechanism, so that the steel tube concrete truss type mixed structure mechanical property test device provided by the invention can perform a bending shear composite stress test and a reciprocating loading test of the steel tube concrete truss type mixed structure under the action of long-term load, and is convenient for researching the influence of the long-term load on the static performance and the shock resistance of the steel tube concrete truss type mixed structure.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a steel pipe concrete truss type mixed structure mechanical property test device in an embodiment provided by the invention;
fig. 2 is a schematic structural view of an axial load adjustment state of a concrete filled steel tube truss type hybrid structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a structure for applying axial and lateral loads to a concrete filled steel tube truss type hybrid structure in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural view of a ferrule assembly for a two-leg concrete filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of the ferrule assembly of FIG. 4 nested within a concrete filled steel tube truss hybrid structure;
FIG. 6 is a schematic structural view of a ferrule assembly for a three-leg concrete filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of the ferrule assembly of FIG. 6 in a first use configuration;
FIG. 8 is a schematic view of a second use condition of the ferrule assembly shown in FIG. 6;
FIG. 9 is a schematic structural view of a cuff assembly for a concrete filled steel tubular truss hybrid of extremities in accordance with an embodiment of the present invention;
FIG. 10 is a schematic illustration of the ferrule assembly of FIG. 9 nested within a concrete filled steel tube truss hybrid structure;
FIG. 11 is a schematic structural view of a ferrule assembly for a two-leg concrete filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 12 is a schematic view of a lateral stop device in accordance with an embodiment of the present invention;
FIG. 13 is a schematic view of an installation of a lateral stop device for a two-leg concrete filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 14 is a schematic view of a first installation of a lateral stop device for a three-leg concrete-filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 15 is a second installation schematic of a lateral stop device for a three-leg concrete filled steel tube truss hybrid structure in accordance with an embodiment of the present invention;
FIG. 16 is a schematic view of an installation of a lateral stop device for a concrete filled steel tube truss type hybrid structure for an extremity in accordance with an embodiment of the present invention;
FIG. 17 is a schematic diagram of a long term loading device in an embodiment provided by the present invention;
Reference numerals:
1. A first end plate; 101. a first splice plate; 102. a sub splice plate;
2. a second end plate; 201. a second splice plate;
3. Steel pipe concrete truss type mixed structure; 301. a first chord; 302. a second chord; 303. a third chord; 304. a fourth chord;
4. A first base; 5. a second seat body; 6. a first linear driving mechanism; 7. a counterforce seat; 8. a second linear driving mechanism; 9. a first side plate; 10. a second side plate; 11. a first platen; 12. a second pressing plate; 13. a mounting base; 14. a bullseye bearing; 15. a connecting block; 16. a guide plate; 17. a pull-press sensor; 18. a connecting plate; 19. a connecting rod; 20. a fixing nut; 21. a disc spring set; 22. a pressure sensor; 23. a connecting shaft; 24. a guide seat; 25. a disc spring seat; 26. a reinforcing seat; 27. and (5) a pull rod.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes a concrete filled steel tube truss type hybrid structure mechanical property test device in an embodiment provided by the invention with reference to fig. 1 to 17.
Specifically, the steel tube concrete truss type mixed structure mechanical property test device comprises an axial force load mechanism, a lateral force load mechanism and a lateral limiting device.
The axial force loading mechanism comprises a first seat body 4, a second seat body 5, an elastic buffer component and a first linear driving mechanism 6. The first end of the first linear driving mechanism 6 is connected with the first seat body 4, and the second end of the first linear driving mechanism 6 is connected with the elastic buffer component. Two ends of the steel pipe concrete truss type mixed structure 3 are respectively connected with the elastic buffer component and the second seat body 5.
By providing the elastic buffer assembly, the first linear driving mechanism 6 can apply axial load to the concrete filled steel tube truss type mixed structure through the elastic buffer assembly. So set up, even steel pipe concrete truss-like mixed structure atress takes place to shrink, elasticity buffer assembly also can supplement the load to avoid the load to reduce too much or even disappear, thereby guarantee the stability and the experimental continuity of applied axial load.
Alternatively, the first and second housings 4 and 5 are each of a reinforced concrete structure, and the first and second housings 4 and 5 are connected to each other by a tie rod 27.
The number of the pull rods 27 is at least four, and two ends of the pull rods 27 respectively penetrate through the first seat body 4 and the second seat body 5 and are in threaded fit with nuts so as to connect the first seat body 4 with the second seat body 5, so that the first seat body 4 and the second seat body 5 form a self-reaction force balancing device, and the first seat body 4 and the second seat body 5 are prevented from shifting in the loading process of the first linear driving mechanism 6. Simultaneously, first pedestal 4 and second pedestal 5 can be fixed through the experimental platform of bolt with the bottom, further prevent the two aversions.
Alternatively, the first linear drive mechanism 6 includes, but is not limited to, a hydraulic cylinder, jack, or actuator.
The lateral force loading mechanism comprises a counter-force seat 7, a second linear driving mechanism 8 and a hoop assembly. The hoop component is used for detachably sleeving the outer periphery side of the concrete filled steel tube truss type mixed structure 3, the first end of the second linear driving mechanism 8 is connected with the counter-force seat 7, and the second end of the second linear driving mechanism is connected with the hoop component.
As shown in fig. 1, alternatively, the reaction seat 7 may be provided as a gantry mechanism including two vertical bars and one horizontal bar.
The two vertical rods are respectively arranged at two sides of the steel tube concrete truss type mixed structure 3, and the bottom ends of the vertical rods are fixedly connected with the experimental platform through bolts and the like. The both ends of horizontal pole are connected with two montants respectively to be equipped with a plurality of locating holes along vertical distribution on the montant, the horizontal pole is selectively connected with arbitrary locating hole to reach the effect of adjustment horizontal pole height, thereby adapt to different specification size's steel pipe concrete truss type mixed structure 3. The second linear drive mechanism 8 is connected at a first end to the cross bar and at a second end to the ferrule assembly.
Alternatively, the second linear drive mechanism 8 includes, but is not limited to, a hydraulic cylinder, jack, or actuator.
The lateral limiting device is used for propping against the side wall of the steel tube concrete truss type mixed structure 3, and the lateral limiting devices are arranged on two sides of the steel tube concrete truss type mixed structure 3.
According to the steel tube concrete truss type mixed structure mechanical property test device provided by the embodiment of the invention, the first linear driving mechanism 6, the first seat body 4, the second seat body 5 and the elastic buffer component can provide axial load for the steel tube concrete truss type mixed structure 3. The hoop component is sleeved on the outer peripheral side of the steel tube concrete truss type mixed structure 3, and the hoop component is pulled and pressed through the second linear driving mechanism 8, so that lateral continuous load or reciprocating load can be provided for the steel tube concrete truss type mixed structure 3.
By arranging lateral limiting devices on two sides of the steel tube concrete truss type mixed structure 3, deformation of the steel tube concrete truss type mixed structure 3 can be limited in a plane formed by the driving direction of the first linear driving mechanism 6 and the driving direction of the second linear driving mechanism 8, so that ideal boundary conditions are constructed, and the problem that the steel tube concrete truss type mixed structure 3 is unstable outside a plane in the loading process due to accidental errors in reality is avoided.
By the arrangement, the steel tube concrete truss type mixed structure mechanical property test device can provide axial load and lateral load for the steel tube concrete truss type mixed structure 3 on the premise of avoiding out-of-plane instability of the steel tube concrete truss type mixed structure 3, so that influence of the load on the mechanical property of the steel tube concrete truss type mixed structure 3 is conveniently studied.
Meanwhile, the steel tube concrete truss type mixed structure mechanical property test device can replace or simulate long-term axial load through the first linear driving mechanism 6, and can provide continuous or reciprocating lateral load for the steel tube concrete truss type mixed structure 3 through the lateral force loading mechanism in the process of providing equivalent long-term axial load through the axial force loading mechanism, so that the steel tube concrete truss type mixed structure mechanical property test device provided by the invention can perform a steel tube concrete truss type mixed structure 3 bending shear composite stress test and a reciprocating loading test under the action of long-term load, and is convenient for researching the influence of long-term load on the static performance and the anti-seismic performance of the steel tube concrete truss type mixed structure 3.
The chord member and web member of the concrete filled steel tube truss type hybrid structure 3 provided by the invention can be a round rod or a square rod. Truss forms in the concrete filled steel tube truss type hybrid structure provided by the invention include, but are not limited to, a Warren type truss (Warren), a Pratt truss (Pratt), a Velender (VIERENDEEL) truss or a modified Warren type truss.
In some embodiments of the present invention, the elastic buffer assembly includes a disc spring set 21, a pressure sensor 22, a connecting shaft 23, and a guide seat 24.
The second end of the first linear driving mechanism 6 abuts against the first end of the disc spring set 21, and the second end of the disc spring set 21 abuts against the first end of the connecting shaft 23 through the pressure sensor 22. The second end of the connecting shaft 23 slidably passes through the guide seat 24 and is hinged with the first end of the concrete filled steel tube truss type mixed structure 3, and the second end of the concrete filled steel tube truss type mixed structure 3 is hinged with the second seat body 5.
The first linear driving mechanism 6 loads the steel tube concrete truss type mixed structure 3 through the disc spring group 21, so that the condition that the axial load is unloaded too much due to the axial shrinkage of the steel tube concrete truss type mixed structure 3 in the loading process can be avoided.
By providing the pressure sensor 22, the load change amount can be known, and when the load drops by more than 10%, the load can be supplemented by the first linear drive mechanism 6.
The first end of the steel pipe concrete truss type mixed structure 3 is hinged with the connecting shaft 23, and the second end of the steel pipe concrete truss type mixed structure 3 is hinged with the second seat body 5, so that when the steel pipe concrete truss type mixed structure 3 is bent under lateral load, the end part of the steel pipe concrete truss type mixed structure 3 can rotate around the corresponding hinge axis to simulate the boundary condition of simple supports at two ends.
The connecting shaft 23 can be limited by arranging the guide seat 24, so that the connecting shaft 23 only stretches and contracts along the axial direction, and deflection is prevented.
Further, the disc spring set 21 may include a plurality of disc springs, the disc spring set 21 may be disposed on the disc spring seat 25, a positioning groove is disposed on the disc spring seat 25, and the disc spring set 21 is disposed in the positioning groove. And the disc spring seat 25 may include a base and a lifting seat liftably provided on the base, and the positioning groove is provided in the lifting seat. So arranged, the height of the disc spring set 21 can be conveniently adjusted to be aligned with the first linear driving mechanism 6.
In some embodiments provided herein, the ferrule assembly is provided with a locating groove into which the chord of the concrete filled steel tube truss type hybrid structure is placed.
The ferrule assembly is provided in a removable frame structure. By the arrangement, the hoop component can be conveniently sleeved on the outer peripheral side of the steel tube concrete truss type mixed structure.
Through set up the constant head tank at the cuff subassembly, on the one hand can make lateral load transfer to steel pipe concrete truss-like mixed structure 3's each chord member, on the other hand can fix a position steel pipe concrete truss-like mixed structure 3, prevents to appear relative movement or rotation between steel pipe concrete truss-like mixed structure 3 and the cuff subassembly.
Referring to fig. 4-10, in some embodiments provided by the present invention, a ferrule assembly includes a first end plate 1, a second end plate 2, a first side plate 9, and a second side plate 10.
The first end plate 1 or the second end plate 2 is connected to a second linear drive mechanism 8.
The first end of the first side plate 9 and the first end of the second side plate 10 are both connected with the first end plate 1 through threaded connectors, and the second end of the first side plate 9 and the second end of the second side plate 10 are both connected with the second end plate 2 through threaded connectors.
The first side plate 9 and the second side plate 10 are connected through a threaded connecting piece. The first end plate 1, the second end plate 2, the first side plate 9 and the second side plate 10 form a frame structure, and the frame structure is sleeved on the outer peripheral side of the steel tube concrete truss type mixed structure 3.
So set up, through setting up the cuff subassembly, second straight line actuating mechanism 8 can draw the steel pipe concrete truss type mixed structure 3 through the cuff subassembly to provide unidirectional load and/or reciprocal load for steel pipe concrete truss type mixed structure 3.
Alternatively, the threaded connection comprises a screw and a nut, both ends of the screw passing through the two parts to be connected respectively and being in threaded engagement with the nut. As shown in fig. 4, taking the example of the connection of the first side plate and the first end plate, the first end of the screw rod passes through the first side plate 9 and is in threaded engagement with the nut, and the second end of the screw rod passes through the first end plate 1 and is in threaded engagement with the nut to connect the first side plate 9 and the first end plate 1. For the convenience of connection, lugs can be arranged on the two parts to be connected, and two ends of the screw rod respectively penetrate through the lugs of the two parts to be connected and are in threaded fit with the nuts. The connection through the threaded connection is described in other parts of this document, which are not described in detail.
Referring to FIG. 4, the left hand view of FIG. 4 is a front view of the ferrule assembly and the right hand view of FIG. 4 is a side view of the ferrule assembly.
Referring to fig. 4 and 5, in some embodiments of the present invention, a positioning groove is provided between the first end plate 1, the first end of the first side plate 9, and the first end of the second side plate 10, where the first chord 301 of the concrete filled steel tube truss type hybrid structure 3 is placed.
And positioning grooves for placing the second chord member 302 of the concrete filled steel tube truss type mixed structure 3 are formed among the second end plate 2, the second end of the first side plate 9 and the second end of the second side plate 10.
With the arrangement, the hoop assembly in the embodiment provided by the invention can be suitable for the two-limb concrete filled steel tube truss type mixed structure 3, and lateral load can be transmitted to each chord member of the two-limb concrete filled steel tube truss type mixed structure 3 in the lateral force loading process by respectively placing each chord member of the two-limb concrete filled steel tube truss type mixed structure 3 into the corresponding positioning groove.
Referring to FIG. 6, the left hand view of FIG. 6 is a front view of the ferrule assembly and the right hand view of FIG. 6 is a side view of the ferrule assembly.
Referring to fig. 6-8, in some embodiments provided by the present invention, the first end plate 1 includes two sub-splice plates 102 connected by a threaded connection. The first ends of the first side plate 9 and the second side plate 10 are connected to two sub splice plates 102, respectively.
Referring to fig. 7 and 8, alternatively, the second end plate 2 of the ferrule assembly is coupled to the second linear drive mechanism 8, or two sub-splice plates 102 are coupled to the second linear drive mechanism 8.
A positioning groove for placing the first chord member 301 of the steel pipe concrete truss type mixed structure 3 is arranged between the first side plate 9 and the sub splice plate 102 connected with the first side plate, a positioning groove for placing the second chord member 302 of the steel pipe concrete truss type mixed structure 3 is arranged between the second side plate 10 and the sub splice plate 102 connected with the second side plate, and a positioning groove for placing the third chord member 303 of the steel pipe concrete truss type mixed structure 3 is arranged on the second end plate 2.
With the arrangement, the hoop assembly in the embodiment provided by the invention can be suitable for the three-limb concrete filled steel tube truss type mixed structure 3, and lateral load can be transmitted to each chord member of the three-limb concrete filled steel tube truss type mixed structure 3 in the lateral force loading process by respectively placing each chord member of the three-limb concrete filled steel tube truss type mixed structure 3 into the corresponding positioning groove.
Referring to FIG. 9, the left hand view of FIG. 9 is a front view of the ferrule assembly and the right hand view of FIG. 9 is a side view of the ferrule assembly.
Referring to fig. 9 and 10, in some embodiments provided by the present invention, the device for testing mechanical properties of a concrete filled steel tube truss type hybrid structure further includes a first pressing plate 11 and a second pressing plate 12.
The first end plate 1 comprises two first splice plates 101 connected by a threaded connection and the second end plate 2 comprises two second splice plates 201 connected by a threaded connection. The first ends of the first side plate 9 and the second side plate 10 are connected to the two first splice plates 101, respectively, and the second ends of the first side plate 9 and the second side plate 10 are connected to the two second splice plates 201, respectively.
The first pressing plate 11 is connected with the first side plate 9 through a threaded connection, and the second pressing plate 12 is connected with the second side plate 10 through a threaded connection. The second splice plate 201 connected to the first side plate 9 is connected to the first pressing plate 11 by a screw connector, and the second splice plate 201 connected to the second side plate 10 is connected to the second pressing plate 12 by a screw connector.
The first pressing plate 11 and the second pressing plate 12 are connected through a threaded connecting piece.
Referring to fig. 10, a positioning groove for placing the first chord 301 of the concrete filled steel tube truss type hybrid structure 3 is provided between the first side plate 9 and the first splice plate 101 connected thereto.
A positioning groove for placing the second chord member 302 of the steel pipe concrete truss type mixed structure 3 is arranged between the second side plate 10 and the first splice plate 101 connected with the second side plate.
The second splice plate 201 connected with the first side plate 9, the first side plate 9 and the first pressing plate 11 are provided with positioning grooves for placing the third chord member 303 of the concrete filled steel tube truss type mixed structure 3.
The second splice plate 201, the second side plate 10 and the second pressing plate 12 connected with the second side plate 10 are provided with positioning grooves for placing the fourth chord member 304 of the steel pipe concrete truss type mixed structure 3.
In use, the ferrule assembly described in this embodiment is used by penetrating the concrete filled steel tube truss hybrid structure 3 into the frame structure and then compacting the steel tube truss hybrid structure by the first and second pressing plates 11, 12, as shown in fig. 9.
With the arrangement, the hoop assembly in the embodiment provided by the invention can be suitable for the four-limb concrete filled steel tube truss type mixed structure 3, and by respectively placing the chords of the four-limb concrete filled steel tube truss type mixed structure 3 into the corresponding positioning grooves, lateral load can be transmitted to the chords of the four-limb concrete filled steel tube truss type mixed structure 3 in the lateral force loading process.
Referring to FIG. 11, in some embodiments of the present invention, the ferrule assembly includes two first splice plates 101 connected by a threaded connection and two second splice plates 201 connected by a threaded connection.
The two first splice plates 101 are connected with the second linear driving mechanism 8, the first splice plates 101 and the second splice plates 201 are in one-to-one correspondence, and the corresponding two splice plates are connected through a threaded connecting piece.
A positioning groove for placing the first chord member 301 of the steel pipe concrete truss type mixed structure 3 is arranged between the first splice plate 101 and the corresponding second splice plate 201, and a positioning groove for placing the second chord member 302 of the steel pipe concrete truss type mixed structure 3 is arranged between the second first splice plate 101 and the corresponding second splice plate 201.
By the arrangement, the hoop component in the embodiment provided by the invention can enable the two-limb concrete filled steel tube truss type mixed structure 3 to be horizontally arranged, so that a stress test of the two-limb concrete filled steel tube truss type mixed structure 3 in the horizontal arrangement can be performed. And through putting each chord member of the two-limb concrete-filled steel tube truss type mixed structure 3 into a corresponding positioning groove respectively, lateral load can be transferred to each chord member of the two-limb concrete-filled steel tube truss type mixed structure 3 in the lateral force loading process.
Referring to fig. 12-16, in some embodiments provided by the present invention, a hoop assembly and a guide plate are also included. The lateral limiting means comprise a mounting seat 13 and a bullseye bearing 14.
The hoop component is used for being sleeved on the chord member of the steel pipe concrete truss type mixed structure 3, and the guide plate 16 is arranged on the hoop component. The bullseye bearing 14 is disposed on the mount 13 and abuts against the guide plate 16.
Two mounting seats 13 oppositely arranged on two sides of the steel tube concrete truss type mixed structure 3 are connected through threaded connectors.
The steel tube concrete truss type mixed structure 3 is limited through the bull's eye bearing 14, lateral bending deformation and axial shrinkage deformation of the steel tube concrete truss type mixed structure 3 cannot be hindered, and therefore test errors are reduced, and test accuracy is improved.
Because the chord member of the steel pipe concrete truss type mixed structure 3 is relatively small in size, the bullnose bearing 14 can be prevented from being separated from the chord member by arranging the guide plate 16 on the hoop component to prop against the bullnose bearing 14, and therefore the limiting effect of the lateral limiting device is improved.
The two mounting seats 13 are connected through the threaded connecting piece to form a self-balancing system, so that the two mounting seats 13 can be prevented from being displaced due to stress in the test process.
Further, the mounting base 13 may be connected to the experimental platform by bolts.
Referring to fig. 12 to 16, the hoop assembly includes two connection blocks 15 connected by a screw connection, a groove for placing a chord member of the concrete filled steel tube truss type hybrid structure 3 is provided between the two connection blocks 15, and a guide plate 16 is connected with the connection blocks 15. So set up, the simple structure of hoop subassembly, convenient to use.
Referring to fig. 13, for the two-limb concrete filled steel tube truss type hybrid structure 3, hoop assemblies are arranged on each chord member, and two guide plates 16 are arranged on each hoop assembly to respectively prop against the bullseye bearings 14 of the mounting seats 13 on two sides.
Referring to fig. 14 and 15, for the three-limb concrete filled steel tube truss type hybrid structure 3, hoop assemblies are arranged on two chords, and each hoop assembly is provided with a guide plate 16. The guide plates on the two chords are respectively propped against the bullseye bearings 14 on the mounting seats 13 on the two sides.
Referring to fig. 16, for the four-limb concrete filled steel tube truss type hybrid structure 3, each chord member is provided with a hoop assembly, and each hoop assembly is provided with a guide plate 16. The guide plates 16 on the two chords on the first side of the steel tube concrete truss type mixed structure 3 are propped against the bullnose bearing 14 on the first side mounting seat 13, and the guide plates 16 on the two chords on the second side of the steel tube concrete truss type mixed structure 3 are propped against the bullnose bearing 14 on the second side mounting seat 13.
In some embodiments of the present invention, the concrete filled steel tube truss hybrid structural mechanical property testing device further includes a reinforcement socket 26 coupled to the ferrule assembly.
The second end of the second linear drive mechanism 8 is coupled to the ferrule assembly via a reinforcing seat 26.
The second linear driving mechanism 8 compresses the hoop assembly through the reinforcing seat, and the overall rigidity of the loading area is increased, so that the loading area of the steel tube concrete truss type mixed structure 3 is subjected to overall rigid deformation, and the stress working condition in reality can be met.
Alternatively, the ferrule assembly may be coupled to the reinforcing seat by bolts or screws.
Optionally, the reinforcing seat is a box-shaped structure and comprises two reinforcing plates arranged oppositely and a plurality of rib plates arranged between the two reinforcing plates. Two ends of each rib plate are respectively connected with the two reinforcing plates.
In some embodiments provided by the present invention, the first end of the second linear driving mechanism 8 is hinged to the counterforce seat 7, the second end of the second linear driving mechanism 8 is hinged to the reinforcing seat 26, and the hinge axis of the second linear driving mechanism 8 and the reinforcing seat 26 is perpendicular to the telescopic direction of the first linear driving mechanism 6.
So set up, when steel pipe concrete truss-like mixed structure 3 receives axial load and contracts, the second end of second linear drive mechanism 8 can incline along with steel pipe concrete truss-like mixed structure 3's shrink to the adjustment of self-adaptation is gone on smoothly in order to guarantee the test.
In some embodiments provided by the invention, the steel pipe concrete truss type mixed structure mechanical property test device further comprises a displacement meter arranged at the second end of the second linear driving mechanism 8.
The displacement of the second end of the second linear driving mechanism 8 caused by the shrinkage of the steel pipe concrete truss type mixed structure 3 is detected through the displacement meter, so that the axial load component and the lateral load component of the second linear driving mechanism 8 acting on the steel pipe concrete truss type mixed structure 3 can be calculated conveniently, and the stress condition of the steel pipe concrete truss type mixed structure 3 can be analyzed more accurately.
Referring to fig. 2 and 17, in some embodiments provided by the invention, the steel pipe concrete truss type mixed structure mechanical property test device further comprises a long-term loading device.
The long-term loading device comprises a tension and compression sensor 17, a connecting rod 19 and a fixing nut 20, and connecting plates 18 are arranged at two ends of the steel tube concrete truss type mixed structure 3.
The two ends of the pulling and pressing sensor 17 are connected with connecting rods 19, and the two connecting rods 19 respectively penetrate through the two connecting plates 18 and are in threaded fit with fixing nuts 20. Optionally, the pull pressure sensor 17 is threadedly connected to the connecting rod 19.
Further, the number of the pull pressure sensors 17 may be set to four. Four tension and compression sensors 17 are distributed along the circumferential direction of the concrete filled steel tube truss type mixed structure 3.
Through setting up long-term loading device and can carry out long-term loading to concrete filled steel tube truss type mixed structure 3, after the long loading of predetermineeing, can be again with concrete filled steel tube truss type mixed structure 3 be connected with axial force load mechanism, side direction load mechanism and side direction stop device respectively, utilize axial force load mechanism to provide with long-term loading device equivalent load after, demolish long-term loading device, can study long-term load and side direction load combined action to the influence of the structural property of concrete filled steel tube truss type mixed structure 3.
According to the long-term loading device provided by the embodiment of the invention, the steel pipe concrete truss type mixed structure 3 is loaded by using the connecting rod 19 and the nut, and after loading is finished, the steel pipe concrete truss type mixed structure 3 is connected to the axial force loading mechanism for carrying out a related test, so that the steel pipe concrete truss type mixed structure 3 does not need to be loaded by consuming energy like a hydraulic cylinder, a press machine and the like, and the test cost can be reduced.
And can set up a plurality of long-term loading device and carry out long-term loading to the concrete filled steel tube truss type mixed structure 3 of multiple different grade type, connect in proper order the concrete filled steel tube truss type mixed structure 3 of different grade type on axial force load mechanism again after long-term loading finishes and test, it is more convenient to use.
The embodiment of the invention also provides a method for testing the mechanical properties of the steel tube concrete truss type mixed structure.
Specifically, the method for testing the mechanical properties of the steel tube concrete truss type mixed structure comprises the following steps:
First, a long-term loading device is connected to the concrete filled steel tube truss type hybrid structure 3, and a load is applied to the concrete filled steel tube truss type hybrid structure 3 in the axial direction by a reaction base and a linear driving mechanism. After screwing the fixing nut 20, the linear driving mechanism is unloaded. When the value of the tension and compression sensor 17 is determined to not reach the preset load value, the linear driving mechanism is utilized to apply load and adjust the tightness of the fixing nut 20 until the value of the tension and compression sensor 17 reaches the preset load value after the linear driving mechanism is unloaded.
Specifically, referring to fig. 17, first, connecting rods 19 at both ends of the tension and compression sensor 17 are respectively passed through connecting plates 18 at both ends of the concrete filled steel tube truss type hybrid structure 3 and screwed with nuts. Then, load is applied along the axial direction of the steel tube concrete truss type mixed structure 3 by utilizing the counter-force seat 7 and the linear driving mechanism, the top fixing nut 20 is screwed down, and then the linear driving mechanism is unloaded, so that whether the numerical value of the tension and compression sensor 17 reaches a preset load value is judged. If not, the adjustment is repeated by changing the axial applied load value of the linear driving mechanism and adjusting the tightness of the top fixing nut 20 until the value of the tension and compression sensor 17 reaches the preset load value. The reaction force seat 7 in the side force load mechanism may be used here, and the linear driving mechanism may be used as the second linear driving mechanism 8 in the side force load mechanism. Of course, a special reaction seat and a linear drive mechanism may be provided for the long-term loading device.
At this time, the connecting rod 19 and the fixing nut 20 provide an axial load to the concrete filled steel tube truss type hybrid structure 3. In order to simulate the long-term loading condition, the steel tube concrete truss type mixed structure 3 is placed for a preset time period, the numerical value of the tension and compression sensor 17 is observed in the period, and if the numerical value of the tension and compression sensor 17 is reduced by more than 5% of a preset load value, the counterforce seat 7 and the linear driving mechanism are utilized for carrying out load compensation.
And then, after the preset time, connecting the steel tube concrete truss type mixed structure 3 with an axial force loading mechanism. And axial load is applied to the concrete filled steel tube truss type mixed structure 3 by utilizing the axial force load mechanism, and when the axial load applied by the axial force load mechanism is equivalent to the load applied by the long-term loading device, the long-term loading device is dismantled.
Specifically, referring to fig. 2, after a preset period of time, the steel pipe concrete truss type hybrid structure 3 is connected to the axial force loading mechanism, and pressure is applied through the first linear driving mechanism 6, when the detection value of the tension and compression sensor 17 is zero, it is indicated that the axial force loading mechanism can replace a long-term loading device to apply an equivalent load to the steel pipe concrete truss type hybrid structure 3, and at this time, the connecting rod 19, the fixing nut 20 and the tension and compression sensor 17 can be removed.
And finally, respectively connecting the steel tube concrete truss type mixed structure 3 with a lateral force loading mechanism and a lateral limiting device. And applies unidirectional load and/or reciprocating load to the concrete filled steel tube truss type mixed structure 3 by using the lateral force load mechanism.
Specifically, after the long-term loading device is removed, a lateral force loading mechanism and a lateral limiting device are installed as shown in fig. 3. By applying lateral load, the test of the bending shear composite stress test and the test of reciprocating loading of the steel tube concrete truss type mixed structure 3 under the action of long-term load can be carried out, so that the influence of the long-term load on the static performance and the anti-seismic performance of the steel tube concrete truss type mixed structure 3 can be conveniently studied.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a steel pipe concrete truss-like mixed structure mechanical properties test device which characterized in that includes:
the axial force load mechanism comprises a first seat body, a second seat body, an elastic buffer assembly and a first linear driving mechanism, wherein the first end of the first linear driving mechanism is connected with the first seat body, the second end of the first linear driving mechanism is connected with the elastic buffer assembly, and two ends of the steel tube concrete truss type mixed structure are respectively connected with the elastic buffer assembly and the second seat body;
The side force loading mechanism comprises a counterforce seat, a second linear driving mechanism and a hoop assembly, wherein the hoop assembly is detachably sleeved on the outer peripheral side of the concrete filled steel tube truss type mixed structure, the first end of the second linear driving mechanism is connected with the counterforce seat, and the second end of the second linear driving mechanism is connected with the hoop assembly;
The lateral limiting device is used for propping against the side wall of the concrete filled steel tube truss type mixed structure, the lateral limiting devices are arranged on two sides of the concrete filled steel tube truss type mixed structure, and the lateral limiting devices are used for limiting deformation of the concrete filled steel tube truss type mixed structure in a plane formed by the driving direction of the first linear driving mechanism and the driving direction of the second linear driving mechanism;
The hoop component is provided with a positioning groove for placing chords of the concrete filled steel tube truss type mixed structure, so that the lateral force load mechanism can transmit loads to the chords of the concrete filled steel tube truss type mixed structure.
2. The steel tube concrete truss type mixed structure mechanical property test device according to claim 1, wherein the elastic buffer component comprises a disc spring group, a pressure sensor, a connecting shaft and a guide seat;
The second end of the first linear driving mechanism is propped against the first end of the disc spring set, and the second end of the disc spring set is propped against the first end of the connecting shaft through the pressure sensor;
the second end of the connecting shaft slidably penetrates through the guide seat and is hinged to the first end of the steel tube concrete truss type mixed structure, and the second end of the steel tube concrete truss type mixed structure is hinged to the second seat body.
3. A concrete filled steel tube truss type hybrid structure mechanical property testing device according to claim 1, wherein the ferrule assembly is provided as a removable frame structure.
4. A concrete filled steel tube truss type mixed structure mechanical property test device according to claim 1, further comprising a hoop assembly and a guide plate, wherein the lateral limiting device comprises a mounting seat and a bullseye bearing;
the hoop component is used for sleeving the chord member of the concrete filled steel tube truss type mixed structure, and the guide plate is connected with the hoop component;
the bullseye bearing is arranged on the mounting seat and abuts against the guide plate;
The two mounting seats which are oppositely arranged on the two sides of the concrete filled steel tube truss type mixed structure are connected through threaded connecting pieces.
5. The steel tube concrete truss type mixed structure mechanical property test device according to claim 4, wherein the hoop component comprises two connecting blocks connected through a threaded connecting piece, a groove for placing a chord member of the steel tube concrete truss type mixed structure is arranged between the two connecting blocks, and the guide plate is connected with the connecting blocks.
6. A concrete filled steel tube truss type hybrid structure mechanical property testing device according to claim 1, further comprising a reinforcing seat connected to said ferrule assembly;
The second end of the second linear drive mechanism is coupled to the ferrule assembly via the reinforcement mount.
7. A concrete filled steel tube truss type hybrid structure mechanical property test device according to claim 1, wherein a first end of the second linear driving mechanism is hinged to the counterforce seat, a second end of the second linear driving mechanism is hinged to the hoop assembly, and a hinge axis between the second linear driving mechanism and the hoop assembly is perpendicular to a telescopic direction of the first linear driving mechanism.
8. A concrete filled steel tube truss type hybrid structure mechanical property test device according to claim 7, further comprising a displacement meter;
The displacement meter is arranged at the second end of the second linear driving mechanism and is used for measuring the displacement of the second end of the second linear driving mechanism.
9. A concrete filled steel tube truss type hybrid structure mechanical property test device according to any one of claims 1 to 8, further comprising a long-term loading device;
The long-term loading device comprises a tension and compression sensor, a connecting rod and a fixing nut, and connecting plates are arranged at two ends of the steel tube concrete truss type mixed structure;
The two ends of the pulling and pressing sensor are connected with the connecting rods, and the two connecting rods respectively penetrate through the two connecting plates and are in threaded fit with the fixing nuts.
10. A method for testing mechanical properties of a concrete-filled steel tube truss type mixed structure, which is implemented based on the device for testing mechanical properties of a concrete-filled steel tube truss type mixed structure according to claim 9, and comprises the following steps:
Connecting a long-term loading device with the steel tube concrete truss type mixed structure, applying load along the axial direction of the steel tube concrete truss type mixed structure by utilizing a counter-force seat and a linear driving mechanism, screwing a fixed nut, unloading the linear driving mechanism, and applying load by utilizing the linear driving mechanism and adjusting the tightness of a fixed nut when the value of a tension-compression sensor is determined to not reach a preset load value, until the value of the tension-compression sensor reaches the preset load value after unloading the linear driving mechanism;
connecting the steel tube concrete truss type mixed structure with the axial force loading mechanism after a preset time period;
Applying an axial load to the concrete filled steel tube truss type mixed structure by utilizing the axial force load mechanism, and dismantling the long-term loading device when the axial load applied by the axial force load mechanism is equivalent to the load applied by the long-term loading device;
The steel tube concrete truss type mixed structure is respectively connected with a lateral force loading mechanism and a lateral limiting device;
and applying unidirectional load and/or reciprocating load to the concrete filled steel tube truss type mixed structure by utilizing the lateral force load mechanism.
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| CN102998174A (en) * | 2011-09-09 | 2013-03-27 | 中交四航工程研究院有限公司 | Long-term loading apparatus system for concrete sample durability tests |
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| CN107202738A (en) * | 2017-07-25 | 2017-09-26 | 福州大学 | A kind of node fatigue test loading device and application method |
| CN107525726A (en) * | 2017-10-01 | 2017-12-29 | 华北理工大学 | Frame structure beam-column-slab connection Oblique loading device |
| CN110398429A (en) * | 2019-06-24 | 2019-11-01 | 武汉大学 | A kind of concrete filled steel tube Experimental Study on Seismic Behavior device and test method considering that work progress influences |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102998174A (en) * | 2011-09-09 | 2013-03-27 | 中交四航工程研究院有限公司 | Long-term loading apparatus system for concrete sample durability tests |
| RU134646U1 (en) * | 2013-06-06 | 2013-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный архитектурно-строительный университет" (ТГАСУ) | STAND FOR STATIC TESTS OF REINFORCED REINFORCED CONCRETE ELEMENTS |
| CN107202738A (en) * | 2017-07-25 | 2017-09-26 | 福州大学 | A kind of node fatigue test loading device and application method |
| CN107525726A (en) * | 2017-10-01 | 2017-12-29 | 华北理工大学 | Frame structure beam-column-slab connection Oblique loading device |
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