CN111751275A - Sliding push-out test device and method for bonding performance of profile steel and confined concrete - Google Patents
Sliding push-out test device and method for bonding performance of profile steel and confined concrete Download PDFInfo
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- CN111751275A CN111751275A CN202010743783.8A CN202010743783A CN111751275A CN 111751275 A CN111751275 A CN 111751275A CN 202010743783 A CN202010743783 A CN 202010743783A CN 111751275 A CN111751275 A CN 111751275A
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Abstract
The invention relates to a test device and a method for bond sliding push-out of section steel and confined concrete, which comprises a bearing platform, an inner frame, an outer frame, a confined stress test device, a displacement meter, a constant load jack, a loading jack, a load sensor, a spherical hinge and a test piece.
Description
Technical Field
The invention belongs to the field of building structure tests, and particularly relates to a device and a method for a section steel and confined concrete bonding performance slippage push-out test.
Background
The steel tube constraint steel concrete column and the FRP constraint steel concrete column have the advantages of high bearing capacity, high rigidity, good anti-seismic performance and the like, and are widely concerned by the academic and engineering fields as novel combined members. Wherein, the bonding property between the section steel and the confined concrete is the foundation that the novel combined member can work well. At present, the bond property of the section steel and the concrete is mainly tested by adopting a push-out test. The existing push-out test device and method can not enable concrete to be in a three-axis compression state under constraint, only can test the bonding performance of profile steel and non-constraint concrete, and can not accurately obtain the bonding performance between the profile steel and the constraint concrete in a steel pipe or FRP constraint steel concrete column.
At present, no relevant literature report is found in the push-out test of the bonding performance of the section steel and the confined concrete, and a laboratory has no relevant test loading device capable of accurately acquiring the bonding performance of the section steel and the confined concrete.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or the problems in the prior art push-out test for the bonding property of section steel to restraint concrete.
Therefore, one of the objectives of the present invention is to provide a device and a method for testing the adhesion between profile steel and confined concrete by sliding, so that the concrete is in a three-axis stressed state under constraint, and the adhesion between profile steel and confined concrete can be accurately obtained.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions: a sliding push-out test device for the bonding performance of profile steel and confined concrete comprises a bearing platform, an inner frame, an outer frame, a confined stress test device, a displacement meter, a constant-load jack, a loading jack, a load sensor, a spherical hinge and a test piece;
the inner frame comprises an inner connecting rod, an upper end plate and a supporting plate; the inner connecting rod is vertically fixed on the bearing platform and sequentially penetrates through the supporting plate and the upper end plate, the upper end plate is fixed on the inner connecting rod, the supporting plate can move up and down, and coaxial mounting through holes are formed in the supporting plate and the upper end plate; the displacement meter is arranged on the supporting plate;
the outer frame comprises an outer connecting rod and a reaction plate; the outer connecting rod penetrates through the reaction plate and is vertically fixed on the bearing platform; the inner frame is fixed in the outer frame;
the spherical hinge is arranged below the supporting plate of the inner frame, and the constant-load jack is arranged below the spherical hinge;
the loading jack is fixed below the reaction plate, and the load sensor is arranged below the loading jack; the test piece is placed in the inner frame;
the constraint stress testing device comprises a strain gauge and a strain acquisition instrument, wherein the strain gauge is installed on the outer surface of the test piece, and the strain gauge is connected with the strain acquisition instrument.
As a preferred scheme of the sliding push-out test device for the bonding property of the section steel and the confined concrete, the invention comprises the following steps: the inner connecting rod comprises 4 screw rods, the lower ends of the screw rods are vertically fixed on the bearing platform, the upper ends of the screw rods sequentially penetrate through the supporting plate and the upper end plate from bottom to top, the screw rods are fixed with the upper end plate through nuts and gaskets, and the distance between the upper end plate and the supporting plate can be adjusted through the nuts.
As a preferred scheme of the sliding push-out test device for the bonding property of the section steel and the confined concrete, the invention comprises the following steps: the outer connecting rod comprises four screw rods, the lower ends of the screw rods are vertically fixed on the bearing platform, and the upper ends of the screw rods penetrate through the reaction plate and are fixed through nuts.
As a preferred scheme of the sliding push-out test device for the bonding property of the section steel and the confined concrete, the invention comprises the following steps: the mounting through hole in the supporting plate is an I-shaped through groove, and the mounting through hole of the upper end plate is a rectangular square hole.
As a preferred scheme of the sliding push-out test device for the bonding property of the section steel and the confined concrete, the invention comprises the following steps: a reserved groove is formed in one side of the supporting plate and communicated with the I-shaped through groove in the supporting plate, the displacement meter is fixed in the I-shaped through groove through screws, and a signal transmission line of the displacement meter is arranged in the reserved groove and connected with the displacement acquisition instrument.
A method for a slippage push-out test of the bonding performance of profile steel and confined concrete comprises the following steps:
the method comprises the following steps: and (3) manufacturing a test piece: and (3) concrete is poured in the steel pipe or the FRP pipe, the section steel is embedded into the center of the concrete, one end of the section steel extends out of the concrete, and the other end of the section steel is flush with the surface of the concrete.
Step two: and placing the test piece to be loaded between the upper end plate and the supporting plate. The upper end of the section steel penetrates through the mounting through hole of the upper end plate, and the lower end of the section steel is centered on the I-shaped through groove of the supporting plate; and installing load sensors, and uniformly screwing the nuts of the outer connecting rods along two opposite corners.
Step three: the lower end of the I-shaped through groove of the supporting plate is provided with a displacement meter, and the signal line is connected with the displacement collector through a reserved groove and used for measuring the slippage of the free end.
Step four: four strain gauges are arranged on the surface of the middle section of the steel pipe or the FRP pipe in the direction perpendicular to the vertical load, and the strain gauges are connected with a strain acquisition instrument to obtain a constraint strain value of the test piece; the four strain gauges are circularly and symmetrically arranged.
Step five: and starting the constant-load jack, loading at a constant speed, reading a constraint strain value, obtaining corresponding constraint stress through the stress-strain relation of the steel pipe or the FRP pipe, and keeping the load value of the constant-load jack constant when the constraint stress reaches a preset value.
Step six: and starting the loading jack, loading at a constant speed by adopting a load control mode, observing the numerical value of the load sensor and the numerical value of the strain acquisition instrument, and finishing the loading when the external load descends to a smooth section or the slippage reaches a preset value.
Step seven: and the displacement collector acquires the sliding quantity of the lower end of the section steel through the pushing load value acquired by the load sensor to obtain the interface bonding property of the section steel and the confined concrete.
The invention has the beneficial effects that: the invention provides a device and a method for a test for sliding and pushing out the bonding performance of profile steel and confined concrete, which can carry out a test for sliding and pushing out the bonding performance of the concrete under the constraint of triaxial compression, can accurately acquire relevant parameters through a constraint stress testing device and a displacement meter, and further analyze the bonding performance between the profile steel and the confined concrete.
Drawings
FIG. 1 is a schematic structural diagram of a section steel and confined concrete bonding performance slippage push-out test device;
FIG. 2 is a schematic structural diagram of an upper end plate of the section steel and confined concrete bonding performance slippage push-out test device;
FIG. 3 is a side schematic view of the upper endplate of FIG. 2;
FIG. 4 is a schematic structural diagram of a support plate of the test device for sliding and pushing out the bonding property between profile steel and confined concrete according to the invention;
FIG. 5 is a side schematic view of the support plate shown in FIG. 4;
FIG. 6 is a schematic structural diagram of a test piece and a constraint stress testing device of the section steel and constraint concrete bonding performance slippage push-out testing device;
fig. 7 is a side view of the test piece and the constraint stress testing apparatus shown in fig. 6.
Reference numerals: 1-section steel, 11-installation through holes, 2-inner connecting rods, 201-screw rods and 3-nuts; 4-upper end plate, 5-confined concrete; 6-support plate, 7-spherical hinge, 8-constant load jack, 9-bearing platform, 91-inner frame, 92-outer frame, 93-constraint stress testing device, 94-test piece, 10-threaded hole, 11-installation through hole, 12-I-shaped through groove, 13-displacement meter, 131-displacement acquisition instrument, 14-connecting bolt, 15-preformed groove, 16-steel pipe, 17-outer connecting rod, 18-load sensor, 19-strain gauge, 20-strain acquisition instrument, 21-reaction plate and 22-load jack.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in FIG. 1, the test device for pushing out the bonding property of the section steel and the confined concrete in a sliding manner comprises: the device comprises an inner frame 91, an outer frame 92, a bearing platform 9, a spherical hinge 7, a constant load jack 8, a loading jack 22, a load sensor 18, a constraint stress testing device 93 and a test piece 94. The inner connecting rod 2 is vertically fixed on the bearing platform 9 and sequentially penetrates through the supporting plate 6 and the upper end plate 4, the upper end plate 4 is fixed on the inner connecting rod 2, and the supporting plate 6 can move up and down; the outer connecting rod 17 passes through the reaction plate 21 and is vertically fixed on the bearing platform 9; the spherical hinge 7 is fixed at the lower part of the support plate 6; the test piece 94 comprises confined concrete 5 and section steel 1, the confined concrete 5 is placed between the upper end plate 4 and the supporting plate 6, and the upper end of the section steel penetrates through the upper end plate 4.
As shown in fig. 6, the constraint stress test device 93 comprises a strain gauge 19 and a strain acquisition instrument 20, wherein the strain gauge 19 is mounted outside a test piece 94 and connected with the strain acquisition instrument 20; the constant-load jack 8 is arranged between the spherical hinge 7 and the bearing platform 9, vertically applies load upwards and keeps constant; the loading jack 22 is fixed under the reaction plate 21, which applies a load vertically downward, and transmits the force to the section steel 1 through the load sensor 18, pushing out the section steel 1.
The inner connecting rod 2 comprises four screw rods 201; the lower ends of the four screw rods 201 are vertically welded on the bearing platform 9, the upper ends of the four screw rods 201 sequentially penetrate through the supporting plate 6 and the upper end plate 4 from bottom to top, and the screw rods 201 are fixed with the upper end plate 4 through nuts 3 and gaskets; the upper end plate 4 can adjust the distance between the upper end plate and the supporting plate 6 through the nut 3 according to the actual requirement of the test piece 94 so as to enlarge the application range of the device.
As shown in fig. 2 and 3, the upper end plate 4 and the support plate 6 are provided with coaxial mounting through holes 11, wherein the mounting through holes of the upper end plate 4 are rectangular square holes through which the upper ends of the section steels 1 pass; the mounting through hole 11 in the supporting plate 6 is an I-shaped through groove 12 so as to facilitate the pushing out of the section steel 1; the displacement meter 13 is fixed in the through hole through a screw and is used for measuring the slippage of the lower end of the section steel 1.
As shown in fig. 4 and 5, a preformed groove 15 is formed in one side of the supporting plate 6, and the preformed groove 15 is communicated with the mounting through hole 11 in the supporting plate 6, so as to facilitate the arrangement of the displacement meter signal transmission line.
The constant-load jack 8 is placed on the bearing platform 9, and vertically and upwards applies load; the spherical hinge 7 is placed between the constant-load jack 8 and the support plate 6, a threaded hole 14 is formed in the support plate 6, and the spherical hinge 7 is fixed to the lower portion of the support plate 6 through a bolt penetrating through the threaded hole 14; the spherical hinge 7 can realize automatic centering of the test piece 94 and the constant-load jack 8, release bending moment generated by accidental eccentricity and effectively improve loading accuracy.
The outer connecting rod 17 comprises four screw rods 202, the lower ends of the screw rods 202 are welded on the bearing platform 9, the upper ends of the screw rods 202 penetrate through the reaction plate 21, and the outer connecting rod is fixed with a gasket and the reaction plate 21 through nuts 3. And a loading jack 22 is welded below the reaction plate 21, and the loading jack 22 vertically applies a load downwards to push out the section steel 1. The load sensor 18 is arranged under the loading jack 22 for measuring the push-out load.
As shown in fig. 7, the test piece 94 includes the confined concrete 5 and the section steel 1, and the confined concrete 5 is composed of the steel pipe/FRP pipe 16 and concrete; under the vertical load of the constant-load jack 8, the concrete is subjected to axial pressure to generate transverse expansion, and under the transverse constraint of the steel pipe/FRP pipe 16, the concrete 5 is constrained to be in a triaxial compression state; the section steel 1 is embedded into concrete along the axial force direction of the member, the upper end of the section steel extends out of the upper surface of the concrete, and the lower end of the section steel is flush with the lower surface of the concrete.
Four strain gauges 19 are symmetrically arranged on the outer surface of the test piece 94, namely the middle surface of the steel pipe/FRP pipe 16, the strain gauges 19 are connected with a strain acquisition instrument 20, the strain acquisition instrument is used for measuring the transverse strain of the steel pipe/FRP pipe 16, and the constraint stress is obtained through the stress-strain relation of the steel pipe/FRP pipe 16.
The test was carried out during the test as follows:
firstly, manufacturing a test piece, namely pouring concrete in a steel pipe or an FRP pipe 16, embedding section steel 1 into the center of the concrete, wherein one end of the section steel 1 extends out of the concrete, and the other end of the section steel is flush with the surface of the concrete.
Step two: the test piece 94 to be loaded is placed between the upper end plate 4 and the support plate 6. The upper end of the section steel 1 penetrates through the mounting through hole of the upper end plate 4, and the lower end of the section steel is aligned to the I-shaped through groove 12 of the support plate 6; load sensors 18 are installed, and nuts of the outer connecting rods 17 are screwed up two by two along opposite corners.
Step three: and a displacement meter 13 is arranged at the lower end of the I-shaped through groove 12 of the supporting plate 6, and a signal wire is connected with a displacement acquisition instrument 131 through a reserved groove 15 and used for measuring the sliding quantity of the lower end of the section steel.
Step four: four strain gauges 19 are arranged on the surface of the middle section of the steel pipe or FRP pipe 16 in the direction perpendicular to the vertical load, and the strain gauges 19 are connected with a strain acquisition instrument 20 to obtain the constraint strain value of the test piece 94; four strain gauges 19 are arranged circumferentially symmetrically.
Step five: and starting the constant-load jack 8, loading at a constant speed, reading a constraint strain value, obtaining corresponding constraint stress through the stress-strain relation of the steel pipe or the FRP pipe 16, and keeping the load value of the constant-load jack 8 constant when the constraint stress reaches a preset value.
Step six: and starting the loading jack 22, loading at a constant speed by adopting a load control mode, observing the numerical value of the load sensor 18 and the numerical value of the strain acquisition instrument 20, and finishing the loading when the external load is reduced to a smooth section or the slippage reaches a preset value.
Step seven: and (3) acquiring the slip quantity of the free end by the displacement meter 13 through the load pushing value acquired by the load sensor 18, and analyzing the interface bonding property of the section steel 1 and the confined concrete 5.
Adopt above-mentioned technical scheme, enable the concrete and be in carrying out the concrete bonding under the triaxial pressurized state under the restraint and slide and release the experiment, can accurately acquire relevant parameter through restraint stress testing arrangement, displacement meter, and then the adhesive property between assay shaping steel and restraint concrete, the device simple structure, convenient to use.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A section steel and confined concrete bonding performance sliding push-out test device is characterized by comprising a bearing platform (9), an inner frame (91), an outer frame (92), a confined stress test device (93), a displacement meter (13), a constant load jack (8), a loading jack (22), a load sensor (18), a spherical hinge (7) and a test piece (94);
the inner frame comprises an inner connecting rod (2), an upper end plate (4) and a supporting plate (6); the inner connecting rod (2) is vertically fixed on the bearing platform (9) and sequentially penetrates through the supporting plate (6) and the upper end plate (4), the upper end plate (4) is fixed on the inner connecting rod (2), the supporting plate (6) can move up and down, and coaxial mounting through holes (11) are formed in the supporting plate (6) and the upper end plate (4);
the displacement meter (13) is arranged on the support plate (6);
the outer frame comprises an outer connecting rod (17) and a reaction plate (21); the outer connecting rod (17) penetrates through the reaction plate (21) and is vertically fixed on the bearing platform (9);
the inner frame (91) is fixed within the outer frame (92);
the spherical hinge (7) is arranged below a supporting plate (6) of the inner frame (91), and the constant-load jack (8) is arranged below the spherical hinge (7);
the loading jack (22) is fixed below the reaction plate (21), and the load sensor (18) is arranged below the loading jack (22);
the test piece (94) is placed in the inner frame (91);
the constraint stress testing device (93) comprises a strain gauge (19) and a strain acquisition instrument (20), wherein the strain gauge (19) is installed on the outer surface of the test piece (94), and the strain gauge (19) is connected with the strain acquisition instrument (20).
2. The device for testing the sliding pushing out of the bonding property between the section steel and the confined concrete according to claim 1, wherein: interior connecting rod (2) include four screw rods (201), screw rod (201) lower extreme vertical fixation is in on cushion cap (9), pass in proper order by supreme down screw rod (201) upper end backup pad (6) and upper end plate (4), screw rod (201) are fixed with upper end plate (4) through nut (3) and gasket, upper end plate (4) accessible nut is adjusted and the distance between backup pad (6).
3. The device for testing the sliding pushing out of the bonding property between the section steel and the confined concrete according to claim 1, wherein: the outer connecting rod (17) comprises four screw rods (202), the lower ends of the screw rods (202) are vertically fixed on the bearing platform (9), and the upper ends of the screw rods (202) penetrate through the reaction plate (21) and are fixed through nuts.
4. The device for testing the sliding pushing out of the bonding property between the section steel and the confined concrete according to claim 1, wherein: the mounting through holes in the supporting plate (6) are I-shaped through grooves (12).
5. The device for testing the sliding pushing out of the bonding property between the section steel and the confined concrete according to claim 1, wherein: the mounting through hole of the upper end plate (4) is a rectangular square hole.
6. The device for testing the sliding pushing out of the bonding property between the section steel and the confined concrete according to claim 4, wherein: a reserved groove (15) is formed in one side of the supporting plate (6), the reserved groove (15) is communicated with the I-shaped through groove in the supporting plate, the displacement meter (13) is fixed in the I-shaped through groove (12) through screws, and a signal transmission line of the displacement meter (13) is arranged in the reserved groove (15) and connected with the displacement acquisition instrument (131).
7. A sliding push-out test method for the bonding performance of profile steel and confined concrete is characterized by comprising the following steps: the test is carried out by using the test device for pushing out the bonding slippage of the section steel and the confined concrete according to claim 1, and comprises the following steps:
firstly, manufacturing a test piece, namely pouring concrete in a steel pipe or an FRP pipe, embedding profile steel into the center of the concrete, wherein one end of the profile steel (1) extends out of the concrete, and the other end of the profile steel is flush with the surface of the concrete;
step two: a test piece (94) to be loaded is placed between the upper end plate (4) and the support plate (6). The upper end of the section steel (1) penetrates through the mounting through hole of the upper end plate (4), and the lower end of the section steel is aligned to the I-shaped through groove of the support plate (6); installing load sensors (18), and uniformly screwing nuts of the outer connecting rods (17) along opposite corners;
step three: a displacement meter (13) is arranged at the lower end of the I-shaped through groove of the supporting plate (6), and a signal line is connected with a displacement acquisition instrument (131) through a reserved groove (15) and used for measuring the slippage of the lower end of the section steel;
step four: four strain gauges are arranged on the surface of the middle section of the steel pipe or the FRP pipe in the direction perpendicular to the vertical load, and the strain gauges (19) are connected with a strain acquisition instrument (20) to obtain a constraint strain value of the test piece; four strain gauges are circularly and symmetrically arranged;
step five: starting the constant load jack (8), loading at a constant speed, reading a constraint strain value, obtaining corresponding constraint stress through the stress-strain relation of the steel pipe or the FRP pipe, and keeping the load value of the constant load jack (18) constant when the constraint stress reaches a preset value;
step six: starting a loading jack (22), loading at a constant speed by adopting a load control mode, observing the numerical value of a load sensor (18) and the numerical value of a displacement acquisition instrument (131), and finishing loading when the external load is reduced to a smooth section or the slippage reaches a preset value;
step seven: the displacement acquisition instrument (131) acquires the sliding quantity of the lower end of the section steel through the pushing load value acquired by the load sensor (18), and the bonding performance of the section steel and the confined concrete interface is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010743783.8A CN111751275A (en) | 2020-07-29 | 2020-07-29 | Sliding push-out test device and method for bonding performance of profile steel and confined concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010743783.8A CN111751275A (en) | 2020-07-29 | 2020-07-29 | Sliding push-out test device and method for bonding performance of profile steel and confined concrete |
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Inventor after: Zhou Chunheng Inventor after: Lin Jingyu Inventor after: Wang Junyi Inventor after: Lang Yicheng Inventor after: Ran Yaqin Inventor before: Zhou Chunheng Inventor before: Pan Jinjing Inventor before: Wang Bing Inventor before: Lin Fanxuan |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201009 |