A strength testing device for steel-wood composite joints

Abstract

This utility model relates to the field of strength testing technology for steel-wood structures, and discloses a strength testing device for steel-wood composite joints. The device includes a frame, with a first displacement module at the lower end of the frame, and a sliding displacement frame mounted on the outer surface of the frame. This strength testing device for steel-wood composite joints uses an angle motor to drive a switching disk to rotate, enabling rapid switching between contact seats of different shapes and equidistant distributions on its lower surface. This allows for adaptation to the contact requirements of different structures, such as glued laminated timber (GLLT) splice joints, GLLT support joints, and GLLT-steel truss web member connection joints. For example, for rebar connection joints, contact seats adapted to the rebar distribution area are selected to simulate the collaborative stress of the rebar and the wood holes. For bolt-steel insert plate connection joints, contact seats adapted to the steel insert plate plane or bolt countersunk holes are selected to ensure a tight fit at the contact interface, avoid stress transmission distortion, and improve the simulation accuracy of the actual stress state of the joint.

Description

Technical Field

[0001] This utility model relates to the field of steel-wood structure strength testing technology, specifically a strength testing device for steel-wood composite joints. Background Technology

[0002] Against the backdrop of green and low-carbon transformation in the construction industry, steel-wood composite structures have been widely used in cultural and tourism buildings, home loft renovations and other scenarios due to their environmental protection characteristics and mechanical advantages. This structure achieves the coordinated force sharing of steel and wood through metal connectors. However, as a key weak link in structural performance, the strength and reliability of nodes directly affect the overall safety. At present, the connection forms of steel-wood composite nodes mainly include pin connections, screw connections and rebar connections. However, existing testing technologies are difficult to fully simulate the real stress behavior of nodes under complex working conditions.

[0003] On the one hand, the fixed and uniform shape of the contact block cannot match the diverse structural features of the above-mentioned nodes. For example, the splicing node of the rebar connection needs to make precise contact with the rebar distribution area to simulate the coordinated force of the rebar and the wooden hole, while the support node of the bolt-steel plate connection needs to be adapted to the planar contact of the steel plate or the local force of the bolt countersunk hole. The standardized contact block of the existing device is difficult to achieve a tight fit with the contact interface of different nodes, which can easily lead to stress transmission distortion and fail to accurately reflect the actual stress state of the node.

[0004] On the other hand, the ability to switch and position the contact position is insufficient, making it difficult to simulate the complex stress scenarios of nodes in actual engineering. Steel-wood nodes often bear axial compression and bending-shear combined effects, and loads need to be applied at different positions to study problems such as stress concentration and deformation incoordination. However, the contact positions of existing devices are mostly fixed designs, and the spatial position of the loading point cannot be flexibly adjusted, making it difficult to achieve multi-directional and multi-position composite loading. This limits the in-depth exploration of the failure mechanism of nodes under different stress conditions, making it difficult for test results to support the optimized design of nodes. Utility Model Content

[0005] The purpose of this utility model is to provide a strength testing device for steel-wood composite joints, so as to solve the problems mentioned in the background art, such as the fixed and single shape of the contact block in existing steel-wood composite joint strength testing devices, which cannot adapt to diverse joint structural features, and the insufficient ability to switch and position the contact position, making it difficult to achieve multi-directional and multi-position composite loading.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a strength testing device for steel-wood composite joints, comprising a frame, a first displacement module at the lower end of the frame, a sliding displacement frame mounted on the outer surface of the frame, the lower end of the displacement frame connected to one end of the first displacement module, a transverse displacement module at the upper end of the displacement frame, a sliding transverse displacement frame mounted on the upper end of the displacement frame, one end of the transverse displacement frame connected to one end of the transverse displacement module, a longitudinal displacement module at the upper end of the transverse displacement frame, a longitudinal displacement frame connected to the lower end of the longitudinal displacement module, a hydraulic rod fixedly mounted on the outer surface of the longitudinal displacement frame, a rotating central gear mounted on the lower end of the hydraulic rod, a crossbar fixedly connected to the lower end of the central gear, an angle motor fixedly mounted inside the middle section of the crossbar, the lower end of the output shaft of the angle motor penetrating the lower surface of the crossbar, a switching disk fixedly connected to the lower end of the output shaft of the angle motor, and a contact seat fixedly mounted on the lower surface of the switching disk;

[0007] A switching motor is fixedly installed on the lower outer surface of the longitudinal frame, and a switching gear is fixedly connected to the lower end of the output shaft of the switching motor. Rotating drums are installed on the inner surfaces of both ends of the crossbar, and sliding piston plates are installed inside the drums. An abutment block is fixedly connected to one outer surface of the piston plate. Functional motors are fixedly installed on the outer surfaces of both ends of the crossbar, and abutment protrusions are fixedly provided on the lower surfaces of both ends of the crossbar.

[0008] Preferably, the length of the crossbar is less than the inner width of the displacement frame, and the crossbar and the central gear are concentrically arranged.

[0009] By adopting the above technical solution, interference between the crossbar and the frame during the sliding process can be avoided, while ensuring the stability of force transmission.

[0010] Preferably, the contact seats are distributed at equal angles on the lower surface of the switching disk, and the different contact seats have different shapes.

[0011] By adopting the above technical solution, it is easy to quickly switch between different shaped abutment seats by driving the switching disk with an angle motor to adapt to steel-wood combination nodes with different structures and ensure that the contact interface fits tightly.

[0012] Preferably, the switching gear and the central gear are at the same horizontal level, and the switching gear and the central gear are meshed together.

[0013] By adopting the above technical solution, the switching motor can drive the crossbar to flexibly adjust its angle through the meshing transmission of the switching gear and the central gear, thereby achieving flexible adjustment of the loading angle.

[0014] Preferably, the rotating cylinder and the piston plate are connected by sliding friction, and a spring is connected between the rotating cylinder and the piston plate, and an opening is provided at the end of the rotating cylinder connected to the crossbar.

[0015] By adopting the above technical solution, when the contact block comes into contact with the test piece, the piston plate can compress the spring to buffer the impact, avoiding damage to the test piece caused by rigid contact. At the same time, the opening design facilitates structural installation and maintenance.

[0016] Preferably, the output shaft of the functional motor passes through the inner surface of the crossbar, and the output shaft of the functional motor is fixedly connected to the rotating drum. The abutting protrusion is a split block design.

[0017] Using the above technical solution, the functional motor can drive the drum to rotate flexibly to adjust the direction of the contact block and ensure the stable support of the contact block.

[0018] Compared with the prior art, the beneficial effects of this utility model are: the strength testing device for the steel-wood composite joint:

[0019] 1. The switching disk is driven by an angle motor to rotate, which can quickly switch the contact seats with different shapes and equidistant distribution on its lower surface. It can be adapted to the contact requirements of different structures such as glued laminated timber splicing nodes, glued laminated timber support nodes, and glued laminated timber-steel truss web member connection nodes. For example, for rebar connection nodes, the contact seat adapted to the rebar distribution area is selected to simulate the joint force of the rebar and the wood hole. For bolt-steel insert plate connection nodes, the contact seat adapted to the steel insert plate plane or bolt countersunk hole is selected to ensure that the contact interface fits tightly, avoid stress transmission distortion, and improve the simulation accuracy of the actual stress state of the node.

[0020] 2. By leveraging the coordinated action of the first displacement module driving the displacement frame, the transverse displacement module driving the transverse frame, and the longitudinal displacement module driving the longitudinal frame, precise positioning of the contact seat in three-dimensional space can be achieved. In conjunction with the switching motor, the crossbar can be flexibly adjusted in angle through the meshing transmission of the switching gear and the central gear. Combined with the load output of the hydraulic rod, the complex stress scenario of steel-wood joints under axial compression and bending-shear combined action can be simulated, meeting the requirements of multi-directional and multi-position composite loading, and providing precise loading conditions for studying problems such as stress concentration and deformation incoordination of joints. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram showing the connection between the frame, the first displacement module, and the displacement frame of this utility model.

[0023] Figure 3 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model;

[0024] Figure 4 This is a three-dimensional structural diagram of the connection between the crossbar, switching disk, and contact seat of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the cross-section of the connection between the crossbar and the angle motor of this utility model;

[0026] Figure 6 This is a three-dimensional cross-sectional view of the rotating drum and the functional motor in operation.

[0027] In the diagram: 1. Frame; 2. First displacement module; 3. Displacement frame; 4. Lateral displacement module; 5. Lateral displacement frame; 6. Longitudinal displacement module; 7. Longitudinal displacement frame; 8. Hydraulic rod; 9. Center gear; 10. Crossbar; 11. Angle motor; 12. Switching disc; 13. Contact seat; 14. Switching motor; 15. Switching gear; 16. Rotary drum; 17. Piston plate; 18. Contact block; 19. Functional motor; 20. Contact protrusion. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-6 This utility model provides a technical solution: a strength testing device for steel-wood composite joints.

[0030] Example 1: This example discloses: a frame 1, a first displacement module 2 at the lower end of the frame 1, and a sliding displacement frame 3 installed on the outer surface of the frame 1, with the lower end of the displacement frame 3 connected to one end of the first displacement module 2. A transverse displacement module 4 is installed at the upper end of the displacement frame 3, and a sliding transverse displacement frame 5 is installed at the upper end of the displacement frame 3, with one end of the transverse displacement frame 5 connected to one end of the transverse displacement module 4. A longitudinal displacement module 6 is installed at the upper end of the transverse displacement frame 5, and a longitudinal displacement frame 7 is connected to the lower end of the longitudinal displacement module 6. A hydraulic rod 8 is fixedly installed on the outer surface of the longitudinal displacement frame 7, and a rotating central gear 9 is installed at the lower end of the hydraulic rod 8. A crossbar 10 is fixedly connected to the lower end of the central gear 9. An angle motor 11 is fixedly installed inside the middle section of the crossbar 10, and the lower end of the output shaft of the angle motor 11 passes through the lower surface of the crossbar 10. A switching disk 12 is fixedly connected to the lower end of the output shaft of the angle motor 11, and a contact seat 13 is fixedly installed on the lower surface of the switching disk 12.

[0031] The length of the crossbar 10 is less than the inner width of the displacement frame 3, and the crossbar 10 and the central gear 9 are concentrically arranged;

[0032] The contact seats 13 are evenly distributed on the lower surface of the switching disk 12, and the different contact seats 13 have different shapes;

[0033] The frame 1 provides basic support for the overall device. Before testing, according to the structural characteristics of the steel-wood node to be tested, the first displacement module 2 drives the displacement frame 3 to slide along the outer surface of the frame 1 to adjust the position of the displacement frame 3. At the same time, the transverse module 4 drives the transverse frame 5 to slide laterally on the upper end of the displacement frame 3, and the longitudinal displacement module 6 drives the longitudinal frame 7 to slide longitudinally along the transverse frame 5. The three work together to achieve precise three-dimensional positioning of the longitudinal frame 7 and the components below, ensuring that the contact seat 13 is initially aligned with the node test area.

[0034] During loading, the hydraulic rod 8 outputs the load, which is transmitted to the switching disk 12 through the central gear 9 and the crossbar 10. Since the crossbar 10 and the central gear 9 are concentrically set, the stability of the force transmission can be guaranteed. In addition, the length of the crossbar 10 is less than the inner width of the displacement frame 3, so as to avoid interference with the frame 1 during the sliding process. When it is necessary to adapt to the contact interface of different nodes, the angle motor 11 drives the switching disk 12 to rotate. Using the abutment seats 13 with different shapes and equally distributed angles on its lower surface, it quickly switches to the contact block that matches the node structure, ensuring a tight fit and providing accurate contact conditions for simulating the stress state of the node under single or combined loads such as axial compression and bending shear.

[0035] Example 2: This example is based on Example 1: A switching motor 14 is fixedly installed on the lower outer surface of the longitudinal frame 7, and a switching gear 15 is fixedly connected to the lower end of the output shaft of the switching motor 14. A rotating drum 16 is installed on the inner surface of both ends of the crossbar 10, and a sliding piston plate 17 is installed inside the drum 16. An abutment block 18 is fixedly connected to one outer surface of the piston plate 17. A functional motor 19 is fixedly installed on the outer surface of both ends of the crossbar 10, and an abutment protrusion 20 is fixedly provided on the lower surface of both ends of the crossbar 10.

[0036] The switching gear 15 and the center gear 9 are at the same horizontal level, and the switching gear 15 and the center gear 9 are meshed together.

[0037] The rotating cylinder 16 and the piston plate 17 are connected by sliding friction, and a spring is connected between the rotating cylinder 16 and the piston plate 17. An opening is provided at the end of the rotating cylinder 16 that is connected to the crossbar 10.

[0038] The output shaft of the functional motor 19 passes through the inner surface of the crossbar 10, and the output shaft of the functional motor 19 is fixedly connected to the rotating drum 16. The abutment protrusion 20 is a split block design.

[0039] When it is necessary to adjust the loading angle to simulate the force on the node in different directions, the switching motor 14 starts, and its output shaft drives the switching gear 15 to rotate. Since the switching gear 15 meshes with the central gear 9 and is at the same horizontal height, it can drive the central gear 9 and the crossbar 10 to rotate synchronously, so as to realize the flexible adjustment of the loading angle.

[0040] When the crossbar 10 rotates to a state parallel to the workpiece under test, the function motor 19 drives the rotating drum 16 to rotate downwards. At this time, the contact block 18 is set vertically downwards. When the hydraulic rod 8 drives the crossbar 10 to move downwards, the contact block 18 contacts the surface of the workpiece under test before the contact seat 13. The contact block 18 drives the piston plate 17 to compress the spring between it and the rotating drum 16 until the outer surface of the contact block 18 is in contact with the lower outer surface of the contact protrusion 20 and is supported. At this time, the workpiece under test can be tested by applying a load to both ends.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A strength testing device for a steel-wood composite joint, comprising a frame (1), wherein a first displacement module (2) is provided at the lower end of the frame (1), and a sliding displacement frame (3) is installed on the outer surface of the frame (1), and the lower end of the displacement frame (3) is connected to one end of the first displacement module (2), characterized in that: The upper end of the displacement frame (3) is provided with a transverse module (4), and the upper end of the displacement frame (3) is provided with a sliding transverse frame (5). One end of the transverse frame (5) is connected to one end of the transverse module (4). The upper end of the transverse frame (5) is provided with a longitudinal displacement module (6), and the lower end of the longitudinal displacement module (6) is connected with a longitudinal frame (7). A hydraulic rod (8) is fixedly installed on the outer surface of the longitudinal frame (7). A rotating central gear (9) is installed on the lower end of the hydraulic rod (8), and a crossbar (10) is fixedly connected to the lower end of the central gear (9). An angle motor (11) is fixedly installed inside the middle section of the crossbar (10), and the lower end of the output shaft of the angle motor (11) passes through the lower surface of the crossbar (10). A switching disk (12) is fixedly connected to the lower end of the output shaft of the angle motor (11), and a contact seat (13) is fixedly provided on the lower surface of the switching disk (12).

2. The strength testing device for a steel-wood composite joint according to claim 1, characterized in that: A switching motor (14) is fixedly installed on the lower outer surface of the longitudinal frame (7), and a switching gear (15) is fixedly connected to the lower end of the output shaft of the switching motor (14). A rotating drum (16) is installed on the inner surface of both ends of the crossbar (10), and a sliding piston plate (17) is installed inside the drum (16). An abutment block (18) is fixedly connected to one outer surface of the piston plate (17). A functional motor (19) is fixedly installed on the outer surface of both ends of the crossbar (10), and an abutment protrusion (20) is fixedly provided on the lower surface of both ends of the crossbar (10).

3. The strength testing device for a steel-wood composite joint according to claim 1, characterized in that: The length of the crossbar (10) is less than the inner width of the displacement frame (3), and the crossbar (10) and the central gear (9) are concentrically arranged.

4. The strength testing device for a steel-wood composite joint according to claim 1, characterized in that: The contact seats (13) are distributed at equal angles on the lower surface of the switching disk (12), and the different contact seats (13) have different shapes.

5. The strength testing device for a steel-wood composite joint according to claim 2, characterized in that: The switching gear (15) and the center gear (9) are at the same horizontal level, and the switching gear (15) and the center gear (9) are meshed together.

6. The strength testing device for a steel-wood composite joint according to claim 2, characterized in that: The rotating cylinder (16) and the piston plate (17) are connected by sliding friction, and a spring is connected between the rotating cylinder (16) and the piston plate (17), and an opening is provided at the end of the rotating cylinder (16) connected to the crossbar (10).

7. The strength testing device for a steel-wood composite joint according to claim 2, characterized in that: The output shaft of the functional motor (19) passes through the inner surface of the crossbar (10), and the output shaft of the functional motor (19) is fixedly connected to the rotating drum (16). The abutting protrusion (20) is a split block design.

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