CN109813604B - Test device and method for testing synergistic performance of steel plates - Google Patents
Test device and method for testing synergistic performance of steel plates Download PDFInfo
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- CN109813604B CN109813604B CN201910219592.9A CN201910219592A CN109813604B CN 109813604 B CN109813604 B CN 109813604B CN 201910219592 A CN201910219592 A CN 201910219592A CN 109813604 B CN109813604 B CN 109813604B
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- 238000012360 testing method Methods 0.000 title claims abstract description 206
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 170
- 239000010959 steel Substances 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002195 synergetic effect Effects 0.000 title claims description 4
- 239000004744 fabric Substances 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 230000000712 assembly Effects 0.000 claims abstract description 19
- 238000000429 assembly Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 230000037237 body shape Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 description 18
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 12
- 239000011151 fibre-reinforced plastic Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a test device for testing the cooperative performance of a test steel plate, which comprises the test steel plate, two tensioning screws and two clamping assemblies, wherein the two clamping assemblies comprise a positive clamping plate and a negative clamping plate which are matched with each other and clamp the test steel plate; and two adjusting threaded holes which are arranged transversely are respectively formed in the two positive clamping plates and are respectively in one-to-one spiral fit with the tensioning screws, and two ends of the test steel plate are respectively fastened on the two clamping assemblies through fastening structures. Thus, the tensile performance of the test steel plate and the externally attached fiber reinforced cloth under different prestress states can be tested. The invention also discloses a method for testing the test device for testing the cooperative performance of the steel plate.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a test device and a method for testing the cooperative performance of a steel plate.
Background
In the reinforcement of the reinforced concrete column, the problem of stress hysteresis effect existing in the traditional reinforcement can be better solved by adopting a transverse pre-stressing technology, the utilization rate and the reinforcement effect of the reinforcement material are effectively improved, and the transverse pre-stressing technology is to apply circumferential pre-stressing force to the reinforcement material, so that the reinforced concrete column obtains active transverse constraint force, the deformability and the bearing capacity of the concrete are improved, and the bearing capacity and the deformability of the reinforcement material are effectively improved. The prestress steel plate hoop (PSJ) reinforcement technology is to reinforce reinforced concrete, so that the axial compression performance, the shearing resistance and the deformation performance of the reinforced concrete column are improved, the section size and the rigidity of the original component are not changed after reinforcement, and the seismic shear distribution of the original structure is not affected.
The prestress steel hoop-fiber reinforced material (FRP) composite reinforcement technology is a novel composite reinforcement technology for a prestress steel plate hoop reinforcement technology, and aims at special reinforcement requirements such as large reinforcement body quantity, high requirement for external reinforcement, requirement for corrosion resistance and durability of outdoor environment and the like. The composite reinforcement technology solves the problem of stress hysteresis effect by providing active transverse constraint force by the prestress steel plate hoops, and fiber reinforced materials (FRP) externally attached to the prestress steel plate hoops provide high-strength transverse constraint force, so that the earthquake resistance of the reinforced concrete column is effectively improved; the technical bottleneck that circumferential prestress is difficult to be applied to the Fiber Reinforced Plastic (FRP) is solved by adopting a prestress steel plate hoop (PSJ) reinforcement technology, the Fiber Reinforced Plastic (FRP) and the prestress steel plate hoop (PSJ) act together, the good ductility of steel can ensure that the transverse constraint force of the reinforced concrete column is not completely lost after the Fiber Reinforced Plastic (FRP) is brittle and stripped, and sudden collapse is avoided; meanwhile, the fiber reinforced material (FRP) can form protection for the steel plate hoop, so that the durability of the steel plate hoop is effectively improved.
However, there is currently no test apparatus for testing the performance of steel hoops in conjunction with fiber reinforced materials (FRPs) at different prestress levels.
Disclosure of Invention
The invention aims to provide a test device and a method for testing the cooperative performance of a steel plate, which can test the cooperative tensile performance of the steel plate and externally attached fiber reinforced cloth under different prestress states.
To achieve the above object, the solution of the present invention is:
the utility model provides a test steel sheet cooperativity test's test device, includes two tensioning screw rods and is used for pressing from both sides two clamping components of establishing test steel sheet, two clamping components is all including being used for mutually supporting in order will positive splint and the negative splint that test steel sheet pressed from both sides are established, with test steel sheet by two when clamping components press from both sides the length direction of test steel sheet is the transverse of test device, two have been seted up respectively on the positive splint along transverse arrangement's regulation screw hole, two the regulation screw hole respectively with tensioning screw rod one-to-one screw cooperation, wherein, two clamping components all are provided with the confession on the fastening structure of the both ends fastening of test steel sheet.
The first ends of the two tensioning screws are respectively in spiral fit with the corresponding adjusting threaded holes.
When the test steel plate is clamped by the two clamping assemblies, the axis of the adjusting threaded hole is located on the extending surface of the test steel plate.
In the same clamping assembly, the positive clamping plate and the negative clamping plate are overlapped and then integrally form a square body shape or a column body shape.
The two positive clamping plates comprise a first bearing platform and a second bearing platform, the first bearing platform and the second bearing platform are connected and are L-shaped, the height of the first bearing platform is larger than that of the second bearing platform, and the adjusting threaded holes are formed in the first bearing platform.
The two negative clamping plates respectively comprise a first abutting table which is overlapped with the first bearing platform and a second abutting table which is overlapped with the second bearing platform, the first abutting table and the second abutting table are connected and are L-shaped, the height of the first abutting table is smaller than that of the second abutting table, and one end of the test steel plate is clamped between the second bearing platform and the second abutting table.
The two fastening structures all include first fastener, first through-hole, steel sheet through-hole and third screw hole, two first fastener all includes the second bolt, same in the clamping component, first through-hole is seted up in on the second butt platform, the steel sheet through-hole is seted up in on the one end of test steel sheet, the third screw hole is seted up on the second cushion cap, the third screw hole with second bolt screw fit, and when the one end clamp of test steel sheet is established in the matched with positive splint with between the negative splint, first through-hole steel sheet through-hole with the third screw hole corresponds each other, just the second bolt inserts in proper order in first through-hole steel sheet through-hole with third screw hole.
The two fastening structures also comprise a second fastening piece, a first threaded hole and a second threaded hole, the two second fastening pieces comprise first bolts, the same clamping assembly is provided with the first threaded holes, the second threaded holes are not communicated with the corresponding adjusting threaded holes, the first threaded holes and the second threaded holes correspond to each other when the positive clamping plates and the negative clamping plates are matched, and the first bolts are screwed into the first threaded holes and the second threaded holes in sequence.
A method for testing a test device for testing the cooperative performance of a steel plate sequentially comprises the following steps:
a1: installing a test steel plate in the test device of claim 1, wherein two ends of the same test steel plate are respectively and correspondingly positioned on the two clamping assemblies; fixing the two tensioning screws by adopting a reaction frame, wherein the first ends of the two tensioning screws are respectively screwed into the corresponding adjusting threaded holes of the clamping assembly, the second ends of the two tensioning screws are respectively inserted into the reaction frame, and then are fixedly connected to the reaction frame through locking nuts, and the tensioning of the two tensioning screws is completed through the pressure applied to the two tensioning screws by the reaction frame, so that prestress is applied to the test steel plate;
a2: setting a preset value, wherein the preset value is the manually set prestress applied to the test steel plate, then adjusting the prestress applied to the test steel plate by adjusting the relative positions between the two tensioning screws and the corresponding adjusting threaded holes respectively, and measuring the prestress applied to the test steel plate by adopting a force sensor;
a3: when the measured value of the force sensor is equal to the preset value, attaching fiber reinforced cloth to the surface of the test steel plate;
a4: stretching the test steel plate attached with the fiber reinforced cloth until the test steel plate attached with the fiber reinforced cloth is pulled out, and measuring the stretching force at the moment through the force sensor;
a5: the test steel plate in step A1 is replaced, and then steps A2 to A5 are repeated.
The force sensor is arranged on the reaction frame, a jack for stretching is further arranged on the reaction frame, the second end of one tensioning screw rod is inserted into the reaction frame, and the tensioning screw rod is inserted into the force sensor and the jack in sequence and then fixedly connected with the locking nut.
The test device for testing the collaborative performance of the steel plate has the following beneficial effects: the test steel plate is jointly clamped by the two clamping assemblies, the two positive clamping plates are respectively provided with a transverse adjusting threaded hole, the two adjusting threaded holes are respectively matched with the screws of the matched tensioning screws, the two ends of the two tensioning screws are fixedly connected, namely, the two tensioning screws are tensioned, prestress is applied to the clamped test steel plate, and then the prestress applied to the test steel plate is adjusted by adjusting the relative positions between the two tensioning screws and the adjusting threaded holes, so that the test steel plate can be tested for the collaborative tension performance of the fiber reinforced cloth attached to the outside under different prestress states.
The method for testing the test device for testing the cooperative performance of the steel plate has the following beneficial effects: the prestress of the test steel plate can be adjusted by adjusting the relative positions between the two tensioning screws and the corresponding adjusting threaded holes respectively, and then the test steel plate attached with the fiber reinforced cloth is stretched, so that the stretching force of the test steel plate attached with the fiber reinforced cloth when the test steel plate is pulled out is obtained, and the cooperative tensile performance of the test steel plate and the externally attached fiber reinforced cloth under different prestress states is obtained, and the test method is simple.
Drawings
FIG. 1 is a front view of a test apparatus according to the present invention.
FIG. 2 is a top view of the test device of the present invention.
Fig. 3 is a schematic structural view of the positive splint according to the present invention.
Fig. 4 is a schematic structural view of a negative splint according to the present invention.
FIG. 5 is a schematic illustration of an experimental set-up in the present invention.
In the figure:
100-test piece
10-test Steel plate 11-Steel plate through-hole
20-tensioning screw 30-clamping assembly
40-Positive clamping plate 41-adjusting threaded hole
42-first bearing platform 421-second threaded hole
43-second bearing platform 431-third threaded hole
50-negative splint 52-first abutment
521-first threaded hole 53-second abutment
531-first through hole 61-first bolt
62-second bolt 71-reaction frame
72-jack 73-force sensor
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
The utility model provides a test device of test steel sheet collaborative performance test, as shown in fig. 1-5, includes test piece 100, and test piece 100 includes two tensioning screw rods 20 and two clamping components 30, corresponds respectively on two clamping components 30 and passes through the both ends of fastening test steel sheet 10 of fastening structure, and two tensioning screw rods 20 are respectively with two clamping components 30 one to one disposes for two clamping components 30 mutually support, are used for pressing from both sides and establish test steel sheet 10. When the test steel plate 10 is clamped on the two clamping components 30, the two clamping components 30 are arranged along the length direction of the test steel plate 10, and fiber reinforced cloth is stuck to the middle of the test steel plate 10, wherein the fiber reinforced cloth is conventional fiber reinforced composite cloth (simply referred to as FRP cloth in the prior art), and the FRP cloth is not contacted with the two clamping components 30. The fiber reinforced cloth is arranged around the middle of the test steel plate 10 and is adhered to the test steel plate 10 through a conventional adhesive.
For convenience of description, the length direction of the test steel plate 10 is the transverse direction of the test device when the test steel plate 10 is clamped by the two clamping assemblies 30.
The two clamping assemblies 30 are identical in structure, and the two clamping assemblies 30 are arranged in mirror image, and one clamping assembly 30 is taken as an example for illustration. The clamping assembly 30 comprises a positive clamping plate 40 and a negative clamping plate 50 which are matched with each other, the positive clamping plate 40 and the negative clamping plate 50 are matched with each other to clamp one end of the test steel plate 10, an adjusting threaded hole 41 is formed in the positive clamping plate 40, the adjusting threaded hole 41 is transversely arranged, the adjusting threaded hole 41 is in spiral fit with the first end of the corresponding tensioning screw 20, the tensioning screw 20 is transversely arranged, the second ends of the tensioning screws 20 are fixed in a conventional manner, for example, the second ends of the two tensioning screws 20 are fixed on a fastening body, the fastening body can be a reaction frame, a test frame or a wall body, and the like, and the conventional manner can be spiral fastening, clamping or through a locking nut and the like.
In the invention, the two positive clamping plates 40 are transversely arranged, the two positive clamping plates 40 are in mirror image arrangement, the two adjusting threaded holes 41 are arranged oppositely, the two negative clamping plates 50 are transversely arranged, and the two negative clamping plates 50 are in mirror image arrangement. And, the positive and negative clamping plates 40 and 50 overlap each other and have a square shape. In addition, the positive and negative clamping plates 40 and 50 overlap each other and may have other shapes, such as a cylindrical shape.
Preferably, when the test steel plate 10 is clamped by the two clamping assemblies 30 and in the same positive clamping plate 40, the adjusting screw holes 41 are connected with the first ends of the corresponding tensioning screws 20, and the axes of the adjusting screw holes 41 are positioned on the extending surface of the test steel plate 10, the two adjusting screw holes 41 are respectively arranged coaxially with the corresponding tensioning screws, so that the tensioning screws 20 apply a force to the test steel plate 10 to ensure that the force applied by the tensioning screws 20 does not provide an additional bending moment.
According to the test device for testing the cooperative performance of the test steel plate, the test steel plate 10 is clamped by the two clamping assemblies 30 together, the two positive clamping plates 40 are provided with the transverse adjusting threaded holes 41, the two adjusting threaded holes 41 are respectively matched with the screws of the matched tensioning screws 20, one ends of the two tensioning screws 20 are fastened on the fastening pieces, the two tensioning screws 20 are pressed through the fastening pieces, so that the two ends of the test steel plate 10 are tensioned, prestress is applied to the test steel plate 10, and prestress with different sizes is applied to the clamped test steel plate 10 by adjusting the relative positions of the two tensioning screws 20 and the corresponding adjusting threaded holes 41, specifically, the two tensioning screws 40 are respectively fastened on the fastening pieces through locking nuts, and before the test, the tensioning screws 20 are fastened through torque wrenches, so that the prestress applied to the test steel plate 10 is changed. Thus, the cooperative tensile performance of the test steel plate 10 and the test steel plate 10 externally attached with the FRP cloth can be tested under different prestress states.
In the present invention, the positive clamping plate 40 includes a first support 42 and a second support 43, the first support 42 and the second support 43 are connected to each other and have an L shape, the height of the first support 42 is greater than that of the second support 43, the adjusting screw hole 41 is located on the first support 42, and the first support 42 and the second support 43 are integrally formed. In addition, the first support 42 and the second support 43 may be connected in other shapes, such as T-shaped. Preferably, the first bearing platform 42 and the second bearing platform 43 are square, so as to increase the clamping area with the test steel plate 10, so that the test steel plate 10 is not easy to loose. The negative clamping plate 50 includes a first abutment table 52 and a second abutment table 53, the first abutment table 52 overlaps the first bearing table 42, the second abutment table 53 overlaps the second bearing table 43, the first abutment table 52 and the second abutment table 53 are connected and L-shaped, and the height of the first abutment table 52 is smaller than the height of the second abutment table 53. When the first base 42 and the second base 43 are connected in the T shape, the first abutment 52 and the second abutment 53 are connected in the mountain shape, and the first abutment 52 and the second abutment 53 are integrally formed. After the test steel plate 10 is mounted, the first end of the test steel plate 10 is sandwiched between the second bearing table 43 and the second abutment table 53.
In the present invention, in one of the clamping assemblies 30, the first end of the test steel plate 10 is fastened between the positive clamping plate 40 and the negative plate 50 by the fastening structure; in the other clamping assembly 30, the second end of the test steel plate 10 is fastened between the positive clamping plate 40 and the negative plate 50 by another fastening structure. The two fastening structures are identical, and therefore, one of the two fastening structures is taken as an example for explanation.
In the same clamping assembly 30, the fastening structure includes a first fastener, a first through hole 531, a steel plate through hole 11, and a third threaded hole 431. The first fastener comprises a second bolt 62, a first through hole 531 is formed in the second abutting platform 53, a steel plate through hole 11 is formed in the first end of the test steel plate 10, a third threaded hole 431 is formed in the second bearing platform 43, and the third threaded hole 431 is in spiral fit with the second bolt 62; after the positive clamping plate 40 and the negative clamping plate 50 are overlapped, and when the first end of the test steel plate 10 is clamped between the positive clamping plate 40 and the negative clamping plate 50 which are matched with each other, the first through hole 531, the steel plate through hole 11 and the third threaded hole 431 correspond to each other, and the second bolt 62 is sequentially inserted into the first through hole 531, the steel plate through hole 11 and the third threaded hole 431. In this way, the positive clamping plate 40, the test steel plate 10, and the negative clamping plate 50 are fixed together by the first fastener.
Preferably, in order to further fix the positive clamping plate 40 and the negative clamping plate 50 together, the fastening structure further includes a second fastener, a first threaded hole 521 and a second threaded hole 42, the second fastener includes a first bolt 611, the first threaded hole 521 is opened on the first abutment 52, the second threaded hole 421 is opened on the first abutment 42, the second threaded hole 421 is a blind hole and is not communicated with the aforementioned adjusting threaded hole 41, the second threaded hole 421 and the first threaded hole 521 correspond to each other after the positive clamping plate 40 and the negative clamping plate 50 overlap, and the second threaded hole 421 and the first threaded hole 521 are both in screw fit with the first bolt 61.
In the present invention, the same fastening structure may have a plurality of first fasteners and a plurality of second fasteners, and in this embodiment, four first fasteners and two second fasteners in the same fastening structure are taken as examples.
In the invention, both ends of the same test steel plate 10 are clamped by the two clamping assemblies 30, the pre-stress is applied to the test steel plate 10 by applying pressure to the two transversely arranged tensioning screws 40, the pre-stress applied to the test steel plate 10 can be changed by adjusting the relative positions between the two tensioning screws 40 and the corresponding adjusting screw holes 41, and then the fiber reinforced cloth is attached to the test steel plate 10, so that the mechanical property of the test steel plate 10 attached with the fiber reinforced cloth after the test, namely the synergistic property of the test steel plate 10 and the fiber reinforced cloth, can be tested. Moreover, after the test steel plate 10 is damaged, the test steel plate 10 is reinstalled on the clamping assembly 30, so that the installation structure is simple and convenient, and time and labor are saved.
In the invention, the test device also comprises a test device, the test device comprises a reaction frame 71, a jack 72 and a force sensor 73, the reaction frame 71 is fixedly arranged on the flat ground, the jack 72 is fixedly arranged on the reaction frame 71, the jack 72 is a conventional through jack, the second end of one tensioning screw 20 on the test piece 100 passes through the reaction frame 71 and is fixed on the reaction frame 71 through a locking nut, the second end of the other tensioning screw 20 sequentially passes through the reaction frame 71, the force sensor 73 and the jack 72, the second end is fixed on the reaction frame 71 through the locking nut, and the jack 72, the two tensioning screws 20 and the force sensor 73 are positioned on the same axis. The jack 72 is used for applying tension to the clamped test steel plate 10, namely, applying prestress to the test steel plate 10; the force sensor 73 is used to measure the magnitude of the pre-stress.
Further, the testing device further comprises a display screen with a control chip, the output end of the force sensor 73 is electrically connected with the input end of the control chip, and the display screen is used for displaying data detected by the force sensor 73. Wherein, the control chip is the existing conventional chip.
The testing process of the testing device is as follows: firstly, mounting a test steel plate 10 on a test device, then adjusting the pressure applied to the two tensioning screws 20 by a reaction frame through adjusting the relative positions between the two tensioning screws 20 and corresponding adjusting threaded holes 41, namely adjusting the tensioning force of the two tensioning screws 20, so as to adjust the pre-stress applied to the test steel plate 10, measuring the initial pre-stress of the test steel plate 10 through a force sensor 73, then tensioning through a jack 72 until the test steel plate 10 attached with fiber reinforced cloth is pulled out, and simultaneously measuring the current tensioning force through the force sensor 73; and then replacing the pulled out test steel plate, and repeating the process, wherein the initial prestress is changed in the repeated process, so that the cooperative working performance of the test steel plate 10 and the fiber reinforced cloth can be obtained under different prestress levels of the test steel plate 10. Wherein, the tester can check the initial pre-stress and the current stretching force after multiple tests on the display screen, wherein, the larger the value measured by the force sensor 73 is, the better the cooperative working performance of the test steel plate 10 and the fiber reinforced cloth is.
The invention also provides a method for testing the test device for testing the cooperative performance of the steel plate, which comprises the following steps:
a1: the test steel plate 10 is installed on the test device, two ends of the same test steel plate 10 are respectively and correspondingly clamped between the positive clamping plate and the negative clamping plate 50 which are matched with each other, the first ends of the two tensioning screws 20 are respectively screwed into the adjusting threaded holes 41 of the corresponding positive clamping plate 40, the second ends of the two tensioning screws 20 are respectively inserted into the counter-force frame 71, the second ends of the two tensioning screws 20 are respectively and fixedly connected to the counter-force frame 71 through locking nuts, and the tensioning of the two tensioning screws 20 is completed through the pressure applied to the two tensioning screws 2 by the counter-force frame 71, so that prestress is applied to the test steel plate;
a2: setting a preset value, wherein the preset value is the manually set prestress applied to the test steel plate 10, then adjusting the prestress applied to the test steel plate by adjusting the relative positions between the two tensioning screws 20 and the corresponding adjusting threaded holes 41, and measuring the prestress applied to the test steel plate by using a force sensor;
a3: when the value measured by the force sensor is equal to a preset value, the fiber reinforced cloth is attached to the middle part of the surface of the test steel plate 10, and the fiber reinforced cloth is wound on the test steel plate 10;
a4: stretching the test steel plate 10 attached with the fiber reinforced cloth until the test steel plate 10 attached with the fiber reinforced cloth is pulled out, and measuring the stretching force at the moment through a force sensor;
a5: and (3) replacing the test steel plate in the step A1, and repeating the steps A2-A5 to obtain the cooperative work performance of the test steel plate 10 and the fiber reinforced cloth under different prestress levels.
It should be noted that, when a plurality of groups of tests are performed, the preset values in the step A2 are different values, and the setting of the preset values is set according to the actual test conditions.
In the present invention, the test piece 100 is stretched by the jack 72, and the test piece 100 measures the magnitude of the prestress and the magnitude of the stretching force by the force sensor 73. The jack 72 and the force sensor 73 are mounted on the reaction frame 71, respectively. The second end of one of the tension screws 20 is inserted into the reaction frame 71, inserted into the force sensor 73 and the jack 72 in this order, and then fixedly connected to the lock nut in step A1.
According to the method for testing the test device for testing the collaborative performance of the steel plate, the pre-stress of the steel plate can be regulated by regulating the relative positions of the two tensioning screws and the two regulating threaded holes 41 respectively, then the steel plate attached with the fiber reinforced cloth is stretched, so that the stretching force of the steel plate attached with the fiber reinforced cloth when the steel plate is pulled out is obtained, and the collaborative tensile performance of the steel plate and the externally attached fiber reinforced cloth under different pre-stress states is obtained.
In addition, the test device not only provides the required prestress for the test steel plate 10, but also does not affect other test operations on the test steel plate 10 externally attached with the fiber reinforcement cloth, and after other tests are completed, the test steel plate 10 can be stretched by the jack described below, and the mechanical properties of the test steel plate 10 externally attached with the fiber reinforcement cloth after the test are tested.
The foregoing description is only of the preferred embodiments of the present invention, and all equivalent changes and modifications that come within the scope of the following claims are intended to be embraced therein.
Claims (8)
1. A test device for testing the cooperative performance of a steel plate is characterized in that: the device comprises two tensioning screws and two clamping assemblies used for clamping a test steel plate, wherein the two clamping assemblies comprise a positive clamping plate and a negative clamping plate which are used for being matched with each other to clamp the test steel plate, the length direction of the test steel plate is the transverse direction of the test device when the test steel plate is clamped by the two clamping assemblies, adjusting threaded holes which are arranged along the transverse direction are respectively formed in the two positive clamping plates, the two adjusting threaded holes are respectively in one-to-one spiral fit with the tensioning screws, and the two clamping assemblies are respectively provided with fastening structures for fastening two ends of the test steel plate;
the two positive clamping plates comprise a first bearing platform and a second bearing platform, the first bearing platform and the second bearing platform are connected and are L-shaped in the same positive clamping plate, the height of the first bearing platform is larger than that of the second bearing platform, and the adjusting threaded hole is formed in the first bearing platform; the two negative clamping plates respectively comprise a first abutting table overlapped with the first bearing platform and a second abutting table overlapped with the second bearing platform, in the same negative clamping plate, the first abutting table and the second abutting table are connected and are L-shaped, the height of the first abutting table is smaller than that of the second abutting table, and one end of the test steel plate is clamped between the second bearing platform and the second abutting table; the middle part of the test steel plate is stuck with fiber reinforced cloth.
2. The test device for testing the collaborative property of a steel plate according to claim 1, wherein: the first ends of the two tensioning screws are respectively in spiral fit with the corresponding adjusting threaded holes.
3. The test device for testing the collaborative property of a steel plate according to claim 1 or 2, wherein: when the test steel plate is clamped by the two clamping assemblies, the axis of the adjusting threaded hole is located on the extending surface of the test steel plate.
4. A test device for testing the synergistic performance of a steel plate according to claim 3, wherein: in the same clamping assembly, the positive clamping plate and the negative clamping plate are overlapped and then integrally form a square body shape or a column body shape.
5. The test device for testing the collaborative property of a steel plate according to claim 1, wherein: the two fastening structures all include first fastener, first through-hole, steel sheet through-hole and third screw hole, two first fastener all includes the second bolt, same in the clamping component, first through-hole is seted up in on the second butt platform, the steel sheet through-hole is seted up in on the one end of test steel sheet, the third screw hole is seted up on the second cushion cap, the third screw hole with second bolt screw fit, and when the one end clamp of test steel sheet is established in the matched with positive splint with between the negative splint, first through-hole steel sheet through-hole with the third screw hole corresponds each other, just the second bolt inserts in proper order in first through-hole steel sheet through-hole with third screw hole.
6. The test device for testing the collaborative property of a steel plate according to claim 1, wherein: the two fastening structures also comprise a second fastening piece, a first threaded hole and a second threaded hole, the two second fastening pieces comprise first bolts, the same clamping assembly is provided with the first threaded holes, the second threaded holes are not communicated with the corresponding adjusting threaded holes, the first threaded holes and the second threaded holes correspond to each other when the positive clamping plates and the negative clamping plates are matched, and the first bolts are screwed into the first threaded holes and the second threaded holes in sequence.
7. The method for testing the test device for testing the cooperative performance of the steel plate is characterized by comprising the following steps in sequence:
a1: installing a test steel plate in the test device of claim 1, wherein two ends of the same test steel plate are respectively and correspondingly positioned on the two clamping assemblies; fixing the two tensioning screws by adopting a reaction frame, wherein the first ends of the two tensioning screws are respectively screwed into the corresponding adjusting threaded holes of the clamping assembly, the second ends of the two tensioning screws are respectively inserted into the reaction frame, and then are fixedly connected to the reaction frame through locking nuts, and the tensioning of the two tensioning screws is completed through the pressure applied to the two tensioning screws by the reaction frame, so that prestress is applied to the test steel plate;
a2: setting a preset value, wherein the preset value is the manually set prestress applied to the test steel plate, then adjusting the prestress applied to the test steel plate by adjusting the relative positions between the two tensioning screws and the corresponding adjusting threaded holes respectively, and measuring the prestress applied to the test steel plate by adopting a force sensor;
a3: when the measured value of the force sensor is equal to the preset value, attaching fiber reinforced cloth to the surface of the test steel plate;
a4: stretching the test steel plate attached with the fiber reinforced cloth until the test steel plate attached with the fiber reinforced cloth is pulled out, and measuring the stretching force at the moment through the force sensor;
a5: the test steel plate in step A1 is replaced, and then steps A2 to A5 are repeated.
8. The method for testing the test device for testing the collaborative property of the steel plate according to claim 7, wherein: the force sensor is arranged on the reaction frame, a jack for stretching is further arranged on the reaction frame, the second end of one tensioning screw rod is inserted into the reaction frame, and the tensioning screw rod is inserted into the force sensor and the jack in sequence and then fixedly connected with the locking nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910219592.9A CN109813604B (en) | 2019-03-21 | 2019-03-21 | Test device and method for testing synergistic performance of steel plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910219592.9A CN109813604B (en) | 2019-03-21 | 2019-03-21 | Test device and method for testing synergistic performance of steel plates |
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