Tensile strength and shear strength combined test device for unilateral bolt connecting piece

Abstract

The invention relates to the technical field of structural engineering, in particular to a unilateral bolt connecting piece tensile strength and shear strength combined test device which comprises a bolt positioning piece, a bolt moving piece, a hydraulic actuator and a sensor assembly. According to the unilateral bolt connecting piece tensile strength and shear strength combined test device, a horizontal load is applied to a bolt moving piece only by utilizing the cooperation of a hydraulic actuator, a bolt positioning piece and the bolt moving piece, so that the conditions of tensile load and shear load borne by a common unilateral bolt in a series of assembly type structures can be accurately simulated; by arranging the first bolt hole and the second bolt hole, it is ensured that tensile and shear test data can be obtained in stages in the same test process, and meanwhile the problems of load direction deviation, out-of-plane instability and the like possibly caused by asymmetry of multiple sets of unilateral bolts and the stress process of the unilateral bolts are solved; and detailed and reliable load and strain relation and load and deformation relation are obtained through the sensor assembly.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, and in particular to a combined tensile and shear strength test device for a single-side bolt connector. Background Art

[0002] In key areas such as the detachable node area of ​​the prefabricated structure, the single-sided bolts are often subjected to tensile and shear loads transmitted by the radial support rods. Their mechanical properties under tensile and shear loads are the key issues in structural design. Therefore, it is necessary to carry out targeted mechanical test research on the tensile and shear strength of single-sided bolts under such working conditions. In the traditional single-sided bolt strength test method, to achieve the loading of tensile or shear loads, it is often necessary to use a loading auxiliary device for opposite stretching, and the two types of single-sided bolt strength tests are carried out separately and independently, which may lead to unnecessary repetitive processes during the test. The existing equipment cannot ensure the symmetry of the loading force and the single-sided bolts when testing the strength of multiple groups of single-sided bolts in a single test, so it is difficult to accurately measure their ultimate strength. In this case, there is an urgent need for a single-sided bolt connection tensile and shear strength combined test device with clear force transmission, simple operation, economical and reliable, to achieve cost reduction and efficiency improvement in scientific research and engineering practice.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a combined tensile and shear strength test device for single-sided bolt connectors, aiming to solve the problem that the existing equipment is unable to ensure the symmetry of the loading force and the single-sided bolts when testing the strength of multiple groups of single-sided bolts in a single test.

[0005] The technical solution of the present invention is as follows:

[0006] A combined tensile and shear strength test device for a single-side bolt connector, comprising:

[0007] A bolt locating member, one side of which is open and the other side is connected to the fixing member; two opposite side walls of the bolt locating member are provided with a plurality of shear test piece locating holes, and the bottom of the bolt locating member is provided with a plurality of tensile test piece locating holes;

[0008] A bolt movable member is embedded in the bolt positioning member and can move along the inner wall of the bolt positioning member; the bolt movable member is provided with a first bolt hole corresponding to the shear test piece positioning hole, and a second bolt hole corresponding to the tensile test piece positioning hole;

[0009] A hydraulic actuator is arranged on a side of the bolt movable part away from the second bolt hole;

[0010] The sensor assembly is used to obtain real-time response data of the load-strain relationship and the load-deformation relationship of a single-sided bolt connection.

[0011] The combined tensile and shear strength test device for a single-sided bolt connector, wherein the cross-section of the bolt positioning piece is one of a U-shape, a double T-shape, and a T-shape.

[0012] The tensile and shear strength combined testing device for a single-sided bolt connector, wherein the cross-section of the bolt movable part is one of a rectangular, I-shaped, and a slot-shaped.

[0013] The combined tensile and shear strength test device for a single-sided bolt connector, wherein the bolt positioning member comprises a bottom, side walls extending from the edges on opposite sides of the bottom toward a side away from the fixing member, and a tensile specimen fixing portion arranged on a side of the bottom away from the fixing member; a plurality of tensile specimen positioning holes are symmetrically arranged on the tensile specimen fixing portion; and a plurality of shear specimen positioning holes are symmetrically arranged on the two side walls.

[0014] The combined tensile and shear strength test device for a single-sided bolt connector is characterized in that a plurality of third bolt holes are provided on the side of the bolt movable part away from the second bolt hole, and the hydraulic actuator is fixed to the bolt movable part through the plurality of third bolt holes.

[0015] The combined tensile and shear strength test device for a single-sided bolt connector, wherein the shape of the first bolt hole is an oblong hole; the length direction of the oblong hole is the direction from the second bolt hole to the hydraulic actuator.

[0016] The tensile and shear strength combined test device for a single-sided bolt connector is characterized in that each of the side walls is provided with a shear test piece positioning hole; and the bottom of the bolt positioning piece is provided with two tensile test piece positioning holes.

[0017] The combined tensile and shear strength test device for a single-sided bolt connector, wherein the combined tensile and shear strength test device for a single-sided bolt connector further comprises a roller frame; the roller frame is disposed on one side of the bolt positioning member and is perpendicular to the side wall.

[0018] The tensile and shear strength combined testing device for a single-sided bolt connector, wherein the roller frame comprises a rod frame and a plurality of rollers arranged on the rod frame.

[0019] The combined tensile and shear strength test device for a single-sided bolt connection, wherein the sensor assembly includes a load sensor connected to the hydraulic actuator, a displacement meter arranged in the spacing area between the bolt locating member and the bolt movable member, and a strain gauge arranged near the shear specimen locating hole and the tensile specimen locating hole.

[0020] Beneficial effect: The present invention provides a combined tensile and shear strength test device for a single-sided bolt connector, comprising: a bolt positioning member, one side of the bolt positioning member is open, and the other side is connected to a fixing member; two opposite side walls of the bolt positioning member are provided with a plurality of shear test piece positioning holes, and the bottom of the bolt positioning member is provided with a plurality of tensile test piece positioning holes; a bolt movable member, embedded in the bolt positioning member and movable along the inner wall of the bolt positioning member; the bolt movable member is provided with a first bolt hole corresponding to the shear test piece positioning hole, and a second bolt hole corresponding to the tensile test piece positioning hole; a hydraulic actuator, arranged on the side of the bolt movable member away from the second bolt hole; a sensor assembly, used to obtain real-time response data of the load-strain relationship and the load-deformation relationship of the single-sided bolt connector. The present invention uses the combined tensile and shear strength test device for single-sided bolt connectors, and only needs to use a hydraulic actuator and the cooperation of a bolt positioning member and a bolt movable member to apply a horizontal load to the bolt movable member, thereby accurately simulating the tensile load and shear load of single-sided bolts commonly used in current beam-column joints, steel plate shear walls, composite floor slabs, lattice shell joints and a series of prefabricated structures; by setting the first bolt hole and the second bolt hole, it is ensured that the tensile and shear test data can be obtained in stages during the same test process, while avoiding the problems of load direction offset and out-of-plane instability that may be caused by the asymmetry of multiple groups of single-sided bolts and their force-bearing processes; and through the sensor assembly, a detailed and reliable load-strain relationship and load-deformation relationship are obtained, which is conducive to the subsequent synchronous analysis of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top cross-sectional view of a combined tensile and shear strength test device for a single-side bolt connector according to the present invention;

[0022] Figure 2 It is a side structural schematic diagram of a combined tensile and shear strength test device for a single-side bolt connector according to the present invention;

[0023] Figure 3 It is a three-dimensional structural schematic diagram of a bolt positioning part and a bolt movable part;

[0024] Figure 4 It is a schematic diagram of the top view of the structure of the bolt movable part;

[0025] Figure 5 It is a side view structural diagram of the bolt movable part;

[0026] Figure 6 It is a schematic diagram of the top view structure of the bolt positioning member;

[0027] Figure 7 It is a side view structural schematic diagram of a bolt positioning member;

[0028] Figure 8 It is a structural schematic diagram of the tension bolt;

[0029] Fig. 9 It is a structural schematic diagram of the roller frame;

[0030] Fig.10 The schematic diagram of the Slip-critical Blind-bolt is a combined test device for the tensile and shear strength of single-sided bolted connections that can be used to test;

[0031] Fig.11 The schematic diagram of Lindapter Hollo-bolt, a combined test device for tensile and shear strength of single-sided bolted connections, is shown;

[0032] Explanation of the reference numerals: bolt locating member 10, side wall 11, shear specimen locating hole 111, bottom 12, tensile specimen locating hole 121, tensile specimen fixing portion 13, tension bolt hole 14, fixing member 20, fixed end 21, fixed end 22, reinforcing rod 23, bolt movable member 30, first bolt hole 31, second bolt hole 32, third bolt hole 33, hydraulic actuator 40, tension bolt 50, roller frame 60, rod frame 61, roller 62, load sensor 70. DETAILED DESCRIPTION

[0033] The present invention provides a combined tensile and shear strength test device for a single-sided bolt connector. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0035] The promotion of recyclable building materials and structural components and parts has become the only way for sustainable development in the field of building structures. The best prefabricated steel structure buildings should realize factory welding of components and full bolt connection between parts and components. Bolt connection has the advantages of good force performance, high connection stiffness, simple construction, and removable and replaceable. It is one of the important means of on-site installation of steel structures. Compared with traditional bolt connection technology, the development and application of single-sided bolts provide a more direct technical solution for the efficient connection of closed-section steel components. Single-sided bolts are a special type of bolt fasteners that have the fastening function and mechanical properties of general bolts, but only need to be installed and tightened on one side of the connected plate, and no operation is required on the other side. The use of single-sided bolts can realize the connection of closed-section columns and beams without destroying the integrity of the column, which meets the construction requirements of building industrialization. Therefore, single-sided bolts are widely used in the connection of components such as beam-column nodes, steel plate shear walls, composite floors, and gridshell nodes.

[0036] In order to measure the tensile strength and shear strength of single-sided bolted joints on the same device, it is necessary to first solve the problems of inconsistent or offset loading direction, out-of-plane instability, etc., and secondly, to ensure that the tensile and shear test data can be obtained in stages. Finally, the connection interface must be controlled to not separate while ensuring the strength requirements of the device. Due to the problems of insufficient anchoring and loose preload of traditional single-sided bolts, this greatly increases the risk of instability during loading.

[0037] Based on this, Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a combined tensile and shear strength test device for a single-sided bolt connector, comprising:

[0038] A bolt locator 10, one side of which is open and the other side is connected to the fixing member 20; two opposite side walls 11 of the bolt locator 10 are provided with a plurality of shear test piece positioning holes 111, and a bottom 12 of the bolt locator 10 is provided with a plurality of tensile test piece positioning holes 121;

[0039] The bolt movable member 30 is embedded in the bolt positioning member 10 and can move along the inner wall of the bolt positioning member 10; the bolt movable member 30 is provided with a first bolt hole 31 corresponding to the shear test piece positioning hole 111, and a second bolt hole 32 corresponding to the tensile test piece positioning hole 121;

[0040] A hydraulic actuator 40 is disposed on a side of the bolt movable member 30 away from the second bolt hole 32;

[0041] The sensor assembly is used to obtain real-time response data of the load-strain relationship and the load-deformation relationship of a single-sided bolt connection.

[0042] In this embodiment, through the combined tensile and shear strength test device for single-sided bolt connectors, it is only necessary to use a hydraulic actuator and the cooperation of a bolt locating part and a bolt movable part to apply a horizontal load to the bolt movable part, so as to accurately simulate the tensile load and shear load of single-sided bolts commonly used in current beam-column joints, steel plate shear walls, composite floor slabs, lattice shell joints and a series of prefabricated structures; by setting the first bolt hole and the second bolt hole, it is ensured that the tensile and shear test data can be obtained in stages during the same test process, while avoiding the problems of load direction offset and out-of-plane instability that may be caused by the asymmetry of multiple groups of single-sided bolts and their force-bearing processes; and through the sensor assembly, a detailed and reliable load-strain relationship and load-deformation relationship are obtained, which is conducive to the subsequent synchronous analysis of the test results.

[0043] In this embodiment, through the combination of the bolt positioning member 10, the bolt movable member 30, the hydraulic actuator 40 and the sensor assembly, the single-sided bolt connector is passed through the shear test piece positioning hole 111 and the first bolt hole 31, and through the tensile test piece positioning hole 121 and the second bolt hole 32, and the shear load and the tensile load of the single-sided bolt are in the same horizontal direction. When a simple horizontal load is applied to the single-sided bolt connector by the hydraulic actuator 40 arranged on one side of the bolt movable member 30, a joint test simulation of the shear load and the tensile load transmitted by the bolt movable member 30 to the single-sided bolt can be achieved. Then, the sensor assembly is used to test in real time the loading size of the horizontal load borne by the connection area between the single-sided bolt connector and the bolt positioning member 10 and the bolt movable member 30, and the strain, deformation and other data of the connector during the experiment are obtained, and the real-time response data of the load-strain relationship and the load-deformation relationship of the single-sided bolt connector are obtained. At the same time, the combined tensile and shear strength test device for unilateral bolted connectors provided by the present invention can be easily replaced for different unilateral bolts, thereby realizing the reuse of the device. The present invention is suitable for testing and studying the tensile and shear strength of unilateral bolted connectors under load in the same direction in new assembled and detachable structural systems.

[0044] In some embodiments, Figure 4 and Figure 5 As shown, the cross section of the bolt movable part 30 is one of a rectangular, an I-shaped, and a slot-shaped one. This can achieve the application scenarios of simulating the connection of components such as actual beam-column joints, steel plate shear walls, composite floors, and lattice shell joints, and can improve the accuracy of the tensile and shear strength tests of single-sided bolt connectors.

[0045] Specifically, the cross section of the bolt movable part 30 is a hollow cross section to achieve the actual application scenario of simulating a single-sided bolt connection; the steel material used for the bolt movable part is ordinary steel or high-strength steel. The length, width and thickness of the bolt movable part are determined according to the value range of the margin, spacing and thickness in the steel structure design specification and the bolt user manual.

[0046] In some embodiments, Figure 6 and Figure 7 As shown, the cross section of the bolt locator 10 is, but not limited to, one of U-shaped, double T-shaped, and T-shaped. It can simulate the application scenarios of actual beam-column joints, steel plate shear walls, composite floors, lattice shell joints and other component connections to improve the accuracy of tensile and shear strength tests of single-sided bolt connectors.

[0047] Specifically, the cross section of the bolt locator 10 is a hollow cross section to simulate the actual application scenario of a single-sided bolt connector; the steel material used for the bolt locator is ordinary steel or high-strength steel. The length, width and thickness of the bolt locator are determined according to the value range of the margin, spacing and thickness in the steel structure design specification and the bolt user manual.

[0048] In some embodiments, the bolt positioning member 10 and the bolt movable member 30 are both steel connection structures, and the rigidity of both are enhanced to improve the strength of the test device.

[0049] In some embodiments, the fixing member 20 includes a fixing end 21 and a fixed end 22, the fixing end 21 is fixed to the bottom of the bolt positioning member 10 by bolts, and the fixed end 22 is fixed to a horizontal plane by bolts, the fixing end 21 and the fixed end 22 are vertically arranged, and a reinforcing rod 23 is provided between the fixing end 21 and the fixed end 22 to improve the strength of the test device.

[0050] In some embodiments, the bolt locating member 10 includes a bottom 12, a side wall 11 extending from the edges on opposite sides of the bottom 12 to a side away from the fixing member 20, and a tensile specimen fixing portion 13 arranged on the side of the bottom 12 away from the fixing member 20; a plurality of the tensile specimen positioning holes 121 are axially symmetrically arranged on the tensile specimen fixing portion 13; and a plurality of the shear specimen positioning holes 111 are axially symmetrically arranged on the two side walls 11.

[0051] Specifically, the bolt locating member 10 is formed into a U-shaped structure by the bottom 12 and the two side walls 11, and the tensile specimen locating hole 121 is symmetrically arranged on the central axis on the tensile specimen fixing portion 13, so that several single-sided bolt connectors passing through the tensile specimen locating hole 121 are subjected to balanced force; and the shear specimen locating holes 111 on the two side walls 11 are also symmetrically arranged on the central axis, so that the single-sided bolt connectors on the two side walls are subjected to consistent force.

[0052] In some embodiments, a plurality of third bolt holes 33 are provided on a side of the bolt movable member 30 away from the second bolt hole 32 , and the hydraulic actuator 40 is fixed to the bolt movable member 30 via the plurality of third bolt holes 33 .

[0053] Specifically, the hydraulic actuator 40 is bolted to the bolt movable part 30 to form a hinged end, which is used to provide load to the bolt movable part 30, thereby providing tension and shear force to the unilateral bolt connection, completing the tension and shear test of the unilateral bolt connection.

[0054] In some embodiments, a plurality of pairs of tension bolt holes 14 are provided on the side of the bolt locator 10 facing away from the fixing member 20; tension bolts 50 are passed through the tension bolt holes 14 to connect the bolt locator 10, that is, to connect the two side walls 11, thereby fixing the vertical position to ensure that during the test, the bolt locator 10 and the bolt movable member 30 do not undergo excessive bending deformation or obvious compressive damage in the horizontal direction, thereby achieving effective fixation and testing of the end position of the single-sided bolt specimen to be tested.

[0055] Specifically, Figure 8 As shown, the tension bolt 50 is composed of a screw rod and a nut threadedly connected to both ends of the screw rod, and mainly provides vertical position fixing for the two side walls of the bolt positioning member 10 .

[0056] In some embodiments, the first bolt hole 31 is in the shape of an oblong hole; the length direction of the oblong hole is the direction of the second bolt hole 32 toward the hydraulic actuator 40. By using the first bolt hole in the shape of an oblong hole, it is ensured that the tensile and shear test data can be obtained in stages during the same test process, while avoiding the problems of load direction deviation and out-of-plane instability that may be caused by multiple groups of unilateral bolts and the asymmetry of their force-bearing process.

[0057] Specifically, the unilateral bolt connector to be tested is passed through the shear test piece positioning hole 111 and the first bolt hole 31 as a unilateral bolt shear test piece, and the unilateral bolt connector to be tested is passed through the tensile test piece positioning hole 121 and the second bolt hole 32 as a unilateral bolt tensile test piece, and then a horizontal tensile load is applied to the unilateral bolt tensile test piece to be tested to perform a tensile strength test, and the unilateral bolt tensile test piece to be tested is unloaded after being tensilely damaged, and the displacement of the hydraulic actuator 40 is controlled until the unilateral bolt tensile test piece contacts the tensile test piece positioning hole 121 and the second bolt hole 32, and then a horizontal tensile load is continuously applied to it to perform a shear strength test, until the unilateral bolt tensile test piece to be tested is unloaded after being sheared and damaged; after the test is completed, the test piece is removed, replaced with a new test piece, and the test is performed again. At this time, the first oblong hole-shaped bolt hole provides a sliding distance when performing a tensile strength test to avoid damage to the unilateral bolt shear test piece. In addition, the size of the irregular oblong hole is adjusted according to the reserved sliding distance as needed.

[0058] In some embodiments, the steel material used for the single-sided bolt connector to be tested, the tension bolt 50 and the roller frame is ordinary steel, high-strength steel or stainless steel.

[0059] In some embodiments, each of the side walls is provided with a shear test piece positioning hole; and the bottom of the bolt positioning piece is provided with two tensile test piece positioning holes, so that each test can complete the tensile strength and shear strength test of two single-sided bolt connectors, and the axisymmetrically arranged shear test piece positioning holes can make the single-sided bolt connectors bear force evenly.

[0060] In some embodiments, the combined tensile and shear strength test device for the single-sided bolt connector further includes a roller frame 60 ; the roller frame 60 is disposed on one side of the bolt positioning member 10 and is perpendicular to the side wall 11 .

[0061] Specifically, except for two side walls, the other two opposite surfaces of the bolt locator 10 are hollow surfaces, and one side of the hollow surface is in contact with the ground through the roller frame. The roller frame is arranged between the bolt locator 10 and the ground to reduce the interference of the friction between the test device and the horizontal plane on the load loading direction and size.

[0062] In some embodiments, Fig. 9 As shown, the roller frame 60 includes a rod frame 61 and a plurality of rollers 62 disposed on the rod frame 61. The rod frame 61 and the rollers 62 are used to form the roller frame, which can minimize the friction between the test device and the horizontal interface, and combined with the design of the bolt positioning member 10 and the tension bolt 50, the vertical position of the single-sided bolt connector can be fixed.

[0063] Specifically, after applying lubricating oil to the connection interface between the bolt movable part 30 and the bolt positioning part 10, a roller frame is arranged directly below the bolt movable part 30. The device is adjusted so that the central axis of the bolt movable part 30 is aligned with the central axis of the bolt positioning part 10. A preliminary experiment is performed by applying a horizontal load using the hydraulic actuator 40 to eliminate the influence of the friction between the bolt movable part 30 and the bolt positioning part 10.

[0064] In some embodiments, the sensor assembly includes a load sensor 70 connected to the hydraulic actuator 40, a displacement meter disposed in the interval area between the bolt locating member and the bolt movable member, and a strain gauge disposed near the shear test piece positioning hole and the tensile test piece positioning hole. The load sensor is used to test the loading size of the horizontal load borne by the connection area of ​​the single-sided bolt connector in real time; the strain gauge, displacement meter and other measuring instruments are used to obtain the strain, deformation and other data of the specimen during the test, and finally obtain the real-time response data of the load-strain and load-deformation relationship curves.

[0065] In some embodiments, the diameters of the shear test piece positioning hole 111, the tensile test piece positioning hole 121, the first bolt hole 31, and the second bolt hole 32 are determined according to the diameter value range of the bolt hole in the bolt user manual. The length and diameter of the tension bolt 50 are determined according to the length and thickness of the bolt movable part 30 and the length and thickness of the bolt positioning part 10.

[0066] Specifically, the combined tensile and shear strength test device for a single-sided bolt connector provided by the present invention can manufacture high-rigidity bolt positioning parts and bolt movable parts according to the geometric parameters of the single-sided bolt connector to be tested, and cooperate with the setting of the roller frame and the tension bolts to ensure that the load direction is always consistent, so that the horizontal tensile and shear loads can be directly applied to the single-sided bolt specimen using loading equipment such as hydraulic actuators. The friction between the test device and the horizontal interface can be reduced by setting the long round holes on both sides of the bolt movable part. It can be ensured that the tensile and shear test data can be obtained in stages during the same test process; and through the tightening effect of the tension bolts, the gap of the connection interface during the shear test is controlled, and the strain, deformation and other data during the test process are obtained through the strain gauge and displacement gauge. After the test, the specimen is removed and replaced to achieve the reuse of the device.

[0067] In some embodiments, Fig.10 and Fig.11 As shown, the combined tensile and shear strength test device for a single-sided bolt connection can be used to test a Slip-critical Blind-bolt or a Lindapter Hollo-bolt.

[0068] When the single-sided bolt connector is tested by using the combined tensile and shear strength test device for the single-sided bolt connector, the advantages brought by the test device mainly include:

[0069] 1) Through the combined tensile and shear strength test device of the single-sided bolt connector, only the horizontal load needs to be applied by using loading equipment such as hydraulic actuators, so as to accurately simulate the tensile and shear loads of the single-sided bolts commonly used in the current beam-column joints, steel plate shear walls, composite floor slabs, lattice shell joints and a series of prefabricated structures.

[0070] 2) The combined tensile and shear strength test device for the single-sided bolt connection can effectively fix and test the vertical position of the end of the single-sided bolt by setting the tension bolts and the roller frame, while reducing the interference of the friction between the test device and the horizontal plane on the direction and size of the load loading.

[0071] 3) The combined tensile and shear strength test device for single-sided bolted connectors ensures that the tensile and shear test data can be obtained in stages during the same test process by setting oblong holes on both sides of the bolt movable parts. At the same time, it avoids problems such as load direction deviation and out-of-plane instability that may be caused by the asymmetry of multiple groups of single-sided bolts and their force-bearing processes.

[0072] 4) The combined tensile and shear strength test device for single-sided bolted connectors avoids unnecessary repetitive processes during the test while restoring the real working conditions as much as possible. Through the coordinated use of load sensors, strain gauges, and displacement gauges, two sets of detailed and reliable data can be obtained, which is conducive to the subsequent synchronous analysis of test results.

[0073] 5) After the test piece to be tested is destroyed, the single-sided bolt shear strength test device can remove the test piece and replace it with a new test piece for testing, thus achieving a reusable effect and having good economic efficiency.

[0074] 6) The combined test device for tensile and shear strength of single-sided bolt connectors of the present invention has clear force transmission, and tests the tensile strength and shear strength of multiple groups of single-sided bolts in stages during the same test process, ensuring the symmetry of the loading force and the single-sided bolts, and can accurately measure their ultimate strength. It is easy to operate, stable and reliable, reusable, and cost-effective. It is suitable for tensile and shear strength tests of single-sided bolt fasteners in the connection of assembled components such as beam-column joints, steel plate shear walls, composite floors, and lattice shell joints under load in the same direction.

[0075] In summary, the present invention provides a combined tensile and shear strength test device for a single-sided bolt connection, comprising: a bolt positioning member, one side of the bolt positioning member is open, and the other side is connected to a fixing member; two opposite side walls of the bolt positioning member are provided with a plurality of shear test piece positioning holes, and the bottom of the bolt positioning member is provided with a plurality of tensile test piece positioning holes; a bolt movable member, embedded in the bolt positioning member and movable along the inner wall of the bolt positioning member; the bolt movable member is provided with a first bolt hole corresponding to the shear test piece positioning hole, and a second bolt hole corresponding to the tensile test piece positioning hole; a hydraulic actuator, arranged on the side of the bolt movable member away from the second bolt hole; a sensor assembly, used to obtain real-time response data of the load-strain relationship and the load-deformation relationship of the single-sided bolt connection. The present invention uses the combined tensile and shear strength test device for single-sided bolt connectors, and only needs to use a hydraulic actuator and the cooperation of a bolt positioning member and a bolt movable member to apply a horizontal load to the bolt movable member, thereby accurately simulating the tensile load and shear load of single-sided bolts commonly used in current beam-column joints, steel plate shear walls, composite floor slabs, lattice shell joints and a series of prefabricated structures; by setting the first bolt hole and the second bolt hole, it is ensured that the tensile and shear test data can be obtained in stages during the same test process, while avoiding the problems of load direction offset and out-of-plane instability that may be caused by the asymmetry of multiple groups of single-sided bolts and their force-bearing processes; and through the sensor assembly, a detailed and reliable load-strain relationship and load-deformation relationship are obtained, which is conducive to the subsequent synchronous analysis of the test results.

[0076] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A combined tensile and shear strength test device for a single-sided bolt connector, characterized in that: include: A bolt locating member, one side of which is open and the other side is connected to the fixing member; two opposite side walls of the bolt locating member are provided with a plurality of shear test piece locating holes, and the bottom of the bolt locating member is provided with a plurality of tensile test piece locating holes; A bolt movable member is embedded in the bolt positioning member and can move along the inner wall of the bolt positioning member; the bolt movable member is provided with a first bolt hole corresponding to the shear test piece positioning hole, and a second bolt hole corresponding to the tensile test piece positioning hole; A hydraulic actuator is arranged on a side of the bolt movable part away from the second bolt hole; The sensor assembly is used to obtain real-time response data of the load-strain relationship and the load-deformation relationship of a single-sided bolt connection.

2. The combined tensile and shear strength test device for a single-sided bolt connector according to claim 1, characterized in that: The cross section of the bolt positioning piece is one of U-shaped, double T-shaped and T-shaped.

3. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: The cross section of the bolt movable part is one of a rectangular, an I-shaped, and a slot-shaped.

4. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: The bolt positioning member includes a bottom, side walls extending from the edges on opposite sides of the bottom toward a side away from the fixing member, and a tensile specimen fixing portion arranged on the side of the bottom away from the fixing member; a number of the tensile specimen positioning holes are axially symmetrically arranged on the tensile specimen fixing portion; and a number of the shear specimen positioning holes are axially symmetrically arranged on the two side walls.

5. The combined tensile and shear strength test device for a single-sided bolt connector according to claim 1, characterized in that: A plurality of third bolt holes are arranged on a side of the bolt movable part away from the second bolt hole, and the hydraulic actuator is fixed to the bolt movable part through the plurality of third bolt holes.

6. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: The shape of the first bolt hole is an oblong hole; the length direction of the oblong hole is the direction from the second bolt hole to the hydraulic actuator.

7. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: Each of the side walls is provided with a shear test piece positioning hole; and the bottom of the bolt positioning piece is provided with two tensile test piece positioning holes.

8. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: The combined tensile and shear strength test device for the single-sided bolt connector also includes a roller frame; the roller frame is arranged on one side of the bolt positioning member and is perpendicular to the side wall.

9. The combined tensile and shear strength test device for a single-side bolt connector according to claim 8, characterized in that: The roller frame comprises a rod frame and a plurality of rollers arranged on the rod frame.

10. The combined tensile and shear strength test device for a single-side bolt connector according to claim 1, characterized in that: The sensor assembly includes a load sensor connected to the hydraulic actuator, a displacement meter arranged in the interval area between the bolt positioning member and the bolt movable member, and a strain gauge arranged near the shear test piece positioning hole and the tensile test piece positioning hole.

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