Assembled shear connector test loading device

Abstract

The utility model relates to the technical field of structural engineering tests, in particular to an assemblable shear connector test loading device which comprises an assemblable loading frame, a hydraulic jack is arranged in the assemblable loading frame, a lifting device is arranged on the upper side of the assemblable loading frame, and a shear connector is detachably connected below the lifting device. The assemblable loading frame comprises a main body counter-force frame, the main body counter-force frame is composed of a left frame beam and a right frame beam, bolt connecting plates are arranged at the connecting positions of the left frame beam and the right frame beam, the two sets of bolt connecting plates are connected through friction type high-strength bolts, and a hydraulic jack is installed on the inner side of the right frame beam through bolts. The steel-concrete shear connector push-out test device solves the problems that a steel-concrete shear connector push-out test is limited by space and is single in connector form, site occupation can be effectively reduced, cost is saved, and the loading frame has assemblability and expansibility so as to adapt to shear connectors of various sizes.

Description

Technical Field

[0001] This utility model relates to the field of structural engineering testing technology, and more specifically, to an assemblable shear connection testing loading device. Background Technology

[0002] Currently, the main test for steel-concrete shear connectors is the push-out test, which has the following drawbacks:

[0003] 1. High equipment requirements: The push-out test requires a large hydraulic loading system and reaction frame, which places strict requirements on the height of the laboratory space and the load-bearing floor, and occupies a large operating space. When the site is small, the preparation of specimens, hoisting and the arrangement of measuring equipment are all constrained;

[0004] 2. Limited specimen size: The specimen structure is limited in size, making it impossible to adapt to various types of structural specimens, especially asymmetrical connection structures, which require separate device design, increasing costs and resulting in low utilization rate;

[0005] 3. High cost: Traditional test equipment has a fixed structure, making transportation and installation difficult and costly, and it is difficult to meet the needs of on-site testing.

[0006] 4. Lack of unified standards: Shear connection specimens vary in size and construction, and the lack of unified testing standards makes it difficult to widely deploy testing equipment;

[0007] The reason why the industry has not yet effectively solved the above problems is that: the fixed structure of the test device requires a high level of site conditions, which is difficult for ordinary universities and small and medium-sized enterprises to meet; large reaction frames and customized components are difficult to transport and install, and are costly and difficult to adapt to on-site testing needs; the shear connection specimens have diverse sizes and structural forms, and there is a lack of unified testing standards, which makes it difficult to widely set up test equipment.

[0008] In view of this, the present invention proposes an assemblable shear connection test loading device to solve the above problems. Utility Model Content

[0009] To address the shortcomings of existing methods, this invention provides an assemblable shear connector test loading device. This invention solves the problem that steel-concrete shear connector push-out tests are limited by space constraints and relatively simple connector types. It can effectively reduce site occupation, save costs, and the assemblability and expandability of the loading frame can adapt to shear connectors of various sizes, facilitating a large number of parametric experiments.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] An assemblable shear connector test loading device includes an assemblable loading frame, a hydraulic jack, a shear connector, a lifting device, and a lateral support mechanism. The assemblable loading frame is equipped with a hydraulic jack inside, and a lifting device is provided on the upper side of the assemblable loading frame. The shear connector is detachably connected below the lifting device. Two sets of lateral support mechanisms are symmetrically arranged on the left and right sides inside the assemblable loading frame.

[0012] The assemblable loading frame consists of a main reaction frame and rectangular steel pipe column bases. The main reaction frame consists of a left frame beam and a right frame beam. The rectangular steel pipe column bases are welded to the right frame beam and the left frame beam. Both the left frame beam and the right frame beam are made of welded steel plates. Bolt connection plates are provided at the connection points of the left frame beam and the right frame beam. The two sets of bolt connection plates are connected by friction-type high-strength bolts. The hydraulic jack is installed on the inside of the right frame beam by bolts.

[0013] Furthermore, the lifting device includes a longitudinal auxiliary mobile device, a transverse auxiliary mobile device, a lifting frame, a hand-cranked winch, and a steel cable. The lifting frame is mounted on the upper side of the loadable frame. The top of the lifting frame is provided with mutually perpendicular longitudinal and transverse auxiliary mobile devices. The transverse auxiliary mobile device is located below the longitudinal auxiliary mobile device and the two are fixedly connected. Both the longitudinal and transverse auxiliary mobile devices are screw modules. The transverse auxiliary mobile device is provided with two sets of slides, and each set of slides is provided with a hand-cranked winch. The hand-cranked winch is wound with a steel cable.

[0014] Furthermore, the shear-resistant connector includes a steel beam, a concrete beam, a connecting structure, and a lifting embedded part. The steel beam is sandwiched between two sets of concrete beams, and the steel beam is connected to the two sets of concrete beams through the connecting structure. Lifting embedded parts are pre-embedded on the upper surface of both sets of concrete beams, and the lifting embedded parts are connected to the end of the steel strand.

[0015] Furthermore, the lateral support mechanism includes a tension gauge, a steel rope, a support plate, support rods, a rotating shaft, and a lateral support connector. Both ends of the support plate are rotatably connected to support rods via the rotating shaft. The other ends of the two sets of support rods are rotatably connected to the lateral support connector via the rotating shaft. The lateral support connector is fixedly connected to the inner side of the longitudinal beam inside the loadable frame by bolts. A steel rope is fixedly connected to the right end of the support plate. A tension gauge is connected to the middle section of the steel rope. The right end of the steel rope is connected through the crossbeam of the right frame.

[0016] Furthermore, both the right frame crossbeam and the left frame crossbeam have two rows of longitudinally arranged bolt holes for connecting the lateral support mechanism.

[0017] Furthermore, multiple sets of bolted connecting plate stiffening ribs are welded at the connection points between the bolted connecting plate and the right frame beam and the left frame beam.

[0018] Furthermore, the hydraulic jack is connected to an external hydraulic station via a hydraulic pipe, and hydraulic control is performed by the external hydraulic station. The hydraulic jack is also equipped with a thrust recording component, which is a pressure sensor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model solves the limitations of traditional push-out test devices by using high-strength bolt assembly, expandable components and lateral support devices, and promotes the transformation of test equipment from customization to generalization. Existing shear test standards are mostly based on fixed specimen size, while this device supports multi-size and multi-condition testing.

[0021] 2. This utility model breaks through the traditional dependence on large reaction frames and high load-bearing sites for testing. By using an assemblable loading frame, it significantly reduces the space occupancy rate of the device.

[0022] 3. The device can be adapted to shear connection specimens of different sizes and structural forms (including asymmetric structures) and can complete loading tests in a conventional laboratory environment. It can be used for shear tests of various shear connections.

[0023] 4. The use of a matching lifting device enables rapid replacement of experimental specimens, facilitating the testing and research of a large number of parameters. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0025] Figure 2 This is a schematic diagram of the assembleable loading frame structure in this utility model.

[0026] Figure 3 This is a schematic diagram of the extended connection part of the loadable frame in this utility model.

[0027] Figure 4 This is a schematic diagram of a test loading component for a shear connection in the prior art.

[0028] Figure 5 This is a schematic diagram of the lifting device for the test component in this utility model.

[0029] Figure 6 This is a schematic diagram of the auxiliary mobile device in this utility model.

[0030] Figure 7 This is a schematic diagram of the lateral support structure in this utility model.

[0031] In the picture:

[0032] 1. Assembleable loading framework;

[0033] 101. Right frame beam; 102. Left frame beam; 103. Bolted connection plate; 104. Rectangular steel pipe column base; 105. Bolt hole; 106. Friction type high-strength bolt; 107. Bolted connection plate stiffening rib;

[0034] 2. Hydraulic jack; 3. Concrete beam; 4. Steel beam; 5. Connection structure; 6. Support plate; 7. Support rod; 8. Lifting frame; 9. Longitudinal auxiliary equipment; 10. Lateral auxiliary equipment; 11. Hand-cranked winch; 12. Steel rope; 13. Lifting embedded parts; 14. Round rod; 15. Screw rod; 16. Force gauge; 17. Steel rope; 18. Lateral support connector; 19. Rotating shaft. Detailed Implementation

[0035] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] Example:

[0037] like Figures 1 to 7 As shown, an assemblable shear connector test loading device includes an assemblable loading frame 1, a hydraulic jack 2, a shear connector, a lifting device, and a lateral support mechanism. The assemblable loading frame 1 is equipped with a hydraulic jack 2 inside. The assemblable loading frame 1 is equipped with a lifting device on its upper side for lifting the shear connector and moving it up and down. The shear connector is detachably connected below the lifting device. The assemblable loading frame 1 is equipped with two sets of lateral support mechanisms symmetrically arranged on the left and right sides inside for providing lateral support to the shear connector.

[0038] The assemblable loading frame 1 consists of a main reaction frame and rectangular steel pipe column bases 104. The main reaction frame consists of a left frame beam 102 and a right frame beam 101. The rectangular steel pipe column bases 104 are welded to the right frame beam 101 and the left frame beam 102 to provide stable support for the entire device. Both the left frame beam 102 and the right frame beam 101 are made of welded steel plates. Bolt connection plates 103 are provided at the connection points of the left frame beam 102 and the right frame beam 101. The two sets of bolt connection plates 103 are connected by friction-type high-strength bolts 106. In addition, stiffening ribs are equidistantly provided on both sides of the longitudinal beam at the connection point and next to the bolt holes 105 of the bolt connection plates 103 to increase stability. The hydraulic jack 2 is installed on the inside of the right frame beam 101 by bolts.

[0039] To ensure that the shear resistance performance test requirements are met, stiffening ribs can be welded to areas of high stress concentration on the load-bearing frame 1 to increase stiffness and strength, ensuring that its stiffness and strength are much greater than those of the shear connector, and that the shear connector can be destroyed by loading.

[0040] This invention overcomes the limitations of traditional push-out test devices through high-strength bolt assembly, expandable components, and lateral support devices, promoting the transformation of testing equipment from customized to universal. Existing shear strength test standards are mostly based on fixed specimen dimensions, while this device supports multi-size and multi-condition testing. This invention breaks through the dependence of traditional push-out tests on large reaction frames and high-load-bearing sites, significantly reducing the space occupancy of the device through an assemblable loading frame.

[0041] In this embodiment, the lifting device includes a longitudinal auxiliary mobile device 9, a transverse auxiliary mobile device 10, a lifting frame 8, a hand-cranked winch 11, and a steel cable 12. The lifting frame 8 is mounted on the upper side of the loadable frame 1. The top of the lifting frame 8 is provided with the longitudinal auxiliary mobile device 9 and the transverse auxiliary mobile device 10, which are perpendicular to each other. The transverse auxiliary mobile device 10 is located below the longitudinal auxiliary mobile device 9 and the two are fixedly connected. Both the longitudinal auxiliary mobile device 9 and the transverse auxiliary mobile device 10 are screw rod 15 modules. The transverse auxiliary mobile device 10 is provided with two sets of slides, and each set of slides is provided with a hand-cranked winch 11. The steel cable 12 is wound on the hand-cranked winch 11. Both the longitudinal auxiliary mobile device 9 and the transverse auxiliary mobile device 10 are provided with a round rod 14 and a screw rod 15. The screw rod 15 is used to drive the movement of the connecting parts on it, and the round rod 14 is used to support the longitudinal auxiliary mobile device 9 and the transverse auxiliary mobile device 10, and at the same time plays a guiding role in the movement of the connecting parts.

[0042] It should be noted that the lead screw 15 module adopts the existing ball screw 15 linear module, and its specific structure and working principle are existing technologies, so they will not be described in detail here.

[0043] In this embodiment, the shear connector includes a steel beam 4, a concrete beam 3, a connecting structure 5, and a lifting embedded part 13. The steel beam 4 is sandwiched between two sets of concrete beams 3, and the steel beam 4 is connected to the two sets of concrete beams 3 through the connecting structure 5. Lifting embedded parts 13 are pre-embedded on the upper surfaces of both sets of concrete beams 3, and the lifting embedded parts 13 are connected to the ends of the steel strand 12. The shear connector is a test sample, and its geometric structure can be changed according to experimental needs, such as by connecting with studs, anchoring steel bars, etc., or by changing the geometric parameters. Since there are many forms of shear connectors in real-world applications, the shear connector in this invention is only for illustration and can be changed according to specific experiments in actual tests.

[0044] In this embodiment, the lateral support mechanism includes a tension gauge 16, a steel rope 17, a support plate 6, support rods 7, a rotating shaft 19, and a lateral support connector 18. Support rods 7 are rotatably connected to both ends of the support plate 6 via the rotating shaft 19. The other ends of the two sets of support rods 7 are rotatably connected to the lateral support connector 18 via the rotating shaft 19. The lateral support connector 18 is bolted to the inner surface of the longitudinal beam inside the load-bearing frame 1. A steel rope 17 is fixedly connected to the right end of the support plate 6, with a tension gauge 16 connected to the middle section of the steel rope 17. The right end of the steel rope 17 is connected through to the right frame crossbeam 101. During the test, the lateral support mechanism provides the necessary lateral support force to prevent lateral displacement or instability of the shear connector under stress, ensuring the accuracy of the test results. After the lifting device raises the shear connector to the corresponding loading position, the steel cable 17 is pulled to provide tension to the support plate 6. Under this force, the support plate 6 transmits the force to the support rod 7 and the lateral support connector 18, causing relative rotation between the support plate 6, the support rod 7, and the lateral support connector 18. Simultaneously, the support plate 6 translates, fitting against the surface of the shear connector. Continuous pulling of the steel cable 17 provides a certain lateral support force to the shear connector, thus achieving lateral support. The tension gauge 16 records the tension value, providing a basis for subsequent calculations of the lateral support force.

[0045] In this embodiment, both the right frame crossbeam 101 and the left frame crossbeam 102 have two rows of longitudinally arranged bolt holes 105 for connecting the lateral support mechanism. The bolt holes 105 are used to fix the lateral support connectors 18 on the lateral support mechanism. By changing the position of the bolt holes 105 through which the bolts pass on the lateral support connectors 18, the position of the lateral support mechanism can be adjusted to meet the usage requirements of different test conditions.

[0046] In this embodiment, multiple sets of stiffening ribs are welded to the bolted connection plate 103 at the connection points with the right frame beam 101 and the left frame beam 102. During the test loading process, the assemblable loading frame 1 will bear a large force, and the bolted connection points, as key stress-bearing parts, will be subjected to large shear and tensile forces. The addition of stiffening ribs can effectively increase the cross-sectional area of ​​the connection points, thereby improving their ability to resist external forces and preventing failure due to local stress concentration. Stiffening ribs can limit the deformation of the connection points, improve the stiffness of the connection, change the stress distribution of the connection points, make the stress more uniformly transmitted, reduce the stress concentration factor, and reduce the risk of fatigue failure caused by stress concentration.

[0047] It should be noted that the hydraulic jack 2 is connected to an external hydraulic station via hydraulic pipes, and is hydraulically controlled by the external hydraulic station. The hydraulic jack 2 is also equipped with a thrust recording component, which is a pressure sensor. The pressure sensor can measure the thrust of the hydraulic jack 2 in real time and accurately, providing the test personnel with accurate force information. By analyzing the thrust data, the test personnel can understand the performance of the shear connection at different stress stages and evaluate its shear performance and load-bearing capacity.

[0048] The working principle of this assemblable shear connection test loading device:

[0049] In practical use, the steel strand 12 is connected to the lifting embedded part 13 on the shear connector. The shear connector is lifted to the corresponding loading position by the lifting device. For shear connectors that require lateral support, a lateral support structure is used to provide lateral support force. At this time, one end face of the concrete beam 3 of the shear connector is attached to the inner surface of the left frame beam 102. After the test loading begins, the hydraulic jack 2 is extended, and a horizontal thrust is applied to the end face of the steel beam 4 through the hydraulic jack 2. At the same time, the horizontal thrust is gradually increased until a large relative slip occurs between the concrete beam 3 and the steel beam 4. This is considered as slip failure of the shear connector. The horizontal thrust is stopped, and the horizontal thrust value applied by the jack to the steel beam 4 when the shear connector fails is recorded by the thrust recording component on the hydraulic jack 2. The shear bearing capacity that the shear connector can withstand when it splits is determined according to the recorded horizontal thrust value.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. An assemblable shear connector test loading device, characterized by: It includes an assemblable loading frame (1), a hydraulic jack (2), a shear connector, a lifting device, and a lateral support mechanism. The assemblable loading frame (1) is equipped with a hydraulic jack (2) inside. The assemblable loading frame (1) is equipped with a lifting device on its upper side. The shear connector is detachably connected below the lifting device. The assemblable loading frame (1) is equipped with two sets of lateral support mechanisms symmetrically arranged on the left and right sides inside. The assemblable loading frame (1) consists of a main reaction frame and rectangular steel pipe column bases (104). The main reaction frame consists of a left frame beam (102) and a right frame beam (101). The rectangular steel pipe column bases (104) are welded to the right frame beam (101) and the left frame beam (102). The left frame beam (102) and the right frame beam (101) are both made of welded steel plates. Bolt connecting plates (103) are provided at the connection between the left frame beam (102) and the right frame beam (101). The two sets of bolt connecting plates (103) are connected by friction type high-strength bolts (106). The hydraulic jack (2) is installed on the inside of the right frame beam (101) by bolts.

2. The test loading device for field-attachable shear connector according to claim 1, wherein: The lifting device includes a longitudinal auxiliary mobile device (9), a transverse auxiliary mobile device (10), a lifting frame (8), a hand-cranked winch (11), and a steel cable (12). The lifting frame (8) is covered on the upper side of the loadable frame (1). The top of the lifting frame (8) is provided with a longitudinal auxiliary mobile device (9) and a transverse auxiliary mobile device (10) that are perpendicular to each other. The transverse auxiliary mobile device (10) is located below the longitudinal auxiliary mobile device (9) and the two are fixedly connected. Both the longitudinal auxiliary mobile device (9) and the transverse auxiliary mobile device (10) are screw (15) modules. The transverse auxiliary mobile device (10) is provided with two sets of slides. Each set of slides is provided with a hand-cranked winch (11). The hand-cranked winch (11) is wound with a steel cable (12).

3. The test loading device for field-attachable shear connector according to claim 2, wherein: The shear-resistant connector includes a steel beam (4), a concrete beam (3), a connecting structure (5), and a lifting embedded part (13). The steel beam (4) is sandwiched between two sets of concrete beams (3). The steel beam (4) is connected to the two sets of concrete beams (3) through the connecting structure (5). The upper end face of both sets of concrete beams (3) is pre-embedded with lifting embedded parts (13), and the lifting embedded parts (13) are connected to the end of the steel strand (12).

4. The test loading device for field-attachable shear connector according to claim 3, wherein: The lateral support mechanism includes a tension gauge (16), a steel rope (17), a support plate (6), a support rod (7), a rotating shaft (19), and a lateral support connector (18). The support plate (6) is rotatably connected to the support rod (7) at both ends via the rotating shaft (19). The other ends of the two sets of support rods (7) are rotatably connected to the lateral support connector (18) via the rotating shaft (19). The lateral support connector (18) is fixedly connected to the inner side of the longitudinal beam inside the loadable frame (1) by bolts. The support plate (6) is fixedly connected to the right end of the steel rope (17). The tension gauge (16) is connected to the middle section of the steel rope (17). The right end of the steel rope (17) is connected through to the right frame crossbeam (101).

5. The test loading device for field-installable shear connector according to claim 4, wherein: The longitudinal beams on the inner sides of the right frame beam (101) and the left frame beam (102) are provided with two rows of longitudinally arranged bolt holes (105) for connecting the lateral support mechanism.

6. The test loading device for field-installable shear connector according to claim 1, wherein: Multiple sets of bolt connection plate (103) stiffening ribs are welded at the connection points between the bolt connection plate (103) and the right frame beam (101) and the left frame beam (102).

7. The test loading device for field-installable shear connector according to claim 1, wherein: The hydraulic jack (2) is connected to an external hydraulic station via a hydraulic pipe and is hydraulically controlled by the external hydraulic station. The hydraulic jack (2) is also equipped with a thrust recording component, which is a pressure sensor.

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