A test device and test method considering multi-directional coupling loading of cable net curtain wall connecting claws

Abstract

The present application relates to a kind of test device and test method considering cable net curtain wall splicing claw multidirectional coupling loading.The test device is used to test the stress state of splicing claw test piece under multidirectional coupling loading, specifically includes loading conversion head, clamping bottom plate and several multidirectional loading inclined grooves installed on clamping bottom plate.Loading conversion head is connected with the splicing claw test piece to be measured and is connected with the top clamping piece of material testing machine, and clamping bottom plate is connected with the bottom clamping piece of material testing machine.Splicing claw test piece includes several splicing claw arms, and the end of each splicing claw arm is connected with the splicing head of ball head screw, and ball head screw is one-to-one corresponding with multidirectional loading inclined groove and is placed on the arc working surface of multidirectional loading inclined groove.Compared with prior art, the test device of the present application has simple structure, self-adaptive alignment function and can realize effective decoupling of mechanical behavior, which provides a reliable means for studying the performance and damage mechanism of splicing claw under complex load.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a test device and test method for considering multi-directional coupling loading of cable net curtain wall splice claws. Background Technology

[0002] The connecting claw is a critical force-transfer node in a point-supported cable-net curtain wall system, responsible for reliably transferring out-of-plane wind loads, seismic forces, and even accidental impact loads borne by the glass panels to the supporting structure. Its mechanical properties directly affect the safety and reliability of the entire curtain wall system. In recent years, with the widespread application of laminated glass and insulated glass technologies, the in-plane load-bearing capacity of glass panels before breakage due to bending effects and after breakage due to membrane effects has significantly improved. This change means that in actual engineering projects, the connecting claw is often subjected to a complex multi-directional coupled stress state under the combined action of out-of-plane and in-plane loads. Once the connecting claw fails under this complex stress, it can easily lead to local failure of the curtain wall's force transmission path, and may even cause the continuous collapse of the supporting structure.

[0003] However, current research on point-supported curtain walls largely focuses on the mechanical response of the glass panels themselves. Systematic research on the crucial joint claw is still in its early stages, and the supporting experimental devices have significant limitations. First, most experimental devices can only achieve unidirectional loading on the joint claw (including the connector), without considering the influence of glass panel deformation under different load conditions on the stress behavior of the connector, and cannot simulate the coupling effect of in-plane and out-of-plane loads under actual working conditions. For example, in literature such as "Bearing Performance of Cast Aluminum Support Components in Point-Supported Glass Buildings," the ends of the joint claw specimens are rigidly constrained, which cannot simulate the additional bending moment transmitted by the connector due to the bending deformation of the actual glass under load. Therefore, it can only simulate simple vertical loading (tension and compression). Second, traditional devices cannot accurately capture and reproduce the deformation development process of key components inside the connector (ball joint screw and glass clamping head), and it is difficult to analyze the development degree and location change process of the damaged area of ​​the joint claw.

[0004] Therefore, given the shortcomings of existing test devices in simulating multi-directional coupled forces and in analyzing the complex stress behavior of the connector claws, there is an urgent need to develop a new test device and supporting test method that considers multi-directional coupled loading of cable net curtain wall connector claws. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the inability to simulate multi-directional coupled forces and the inability to analyze the complex stress behavior of cable mesh curtain wall connectors, by providing a test device and method that considers multi-directional coupled loading of cable mesh curtain wall connectors. This invention cleverly eliminates the glass clamping head; the rotation of the clamping head caused by the bending of the glass is equivalently represented by a slanted groove, considering the coupled forces under constant load response (with the glass clamping head rotating at a fixed angle). Through the innovative multi-directional coupled loading mechanism of this invention, the ratio of in-plane to out-of-plane loads acting on the connector specimen can be precisely controlled and decoupled, thereby systematically studying its mechanical properties and damage development mechanisms under different load conditions.

[0006] The objective of this invention can be achieved through the following technical solutions: The present invention first provides a test device for considering multi-directional coupling loading of cable mesh curtain wall splice claws. The test device is used to test the stress state of splice claw specimens under multi-directional coupling loading. Specifically, it includes a loading conversion head, a clamping base plate and several multi-directional loading grooves that are detachably installed on the clamping base plate. The loading conversion head is connected to the test specimen and to the top clamping part of the material testing machine, and the clamping base plate is connected to the bottom clamping part of the material testing machine. The connector claw specimen includes several connector claw arms, and the end of each connector claw arm is connected to a connector with a ball-head screw. The ball-head screw corresponds one-to-one with the multi-directional loading groove and is placed on the arc-shaped working surface of the multi-directional loading groove.

[0007] Furthermore, the loading conversion head includes a conversion head plate and a conversion head vertical plate arranged perpendicularly to the conversion head plate.

[0008] Furthermore, the conversion head plate is securely connected to the top surface of the connector claw specimen by a number of first fasteners.

[0009] Furthermore, the vertical plate of the conversion head is connected to the top clamping component of the material testing machine.

[0010] Furthermore, the clamping base plate includes a clamping plate flat plate and a vertical connecting plate arranged perpendicularly to the clamping plate flat plate.

[0011] Furthermore, the multi-directional loading groove is connected to the clamping plate plate via a second fastener.

[0012] Furthermore, the vertical connecting plate is connected to the bottom clamping component of the material testing machine.

[0013] Furthermore, a triangular web is connected between the vertical connecting plate and the clamping plates on both sides.

[0014] Furthermore, the multi-directional loading chute includes a chute body and ear plates connected to both sides of the chute body.

[0015] Furthermore, the ear plate is connected to the clamping base plate by a second fastener.

[0016] Furthermore, the centerline of the arc-shaped working surface of the multi-directional loading groove is aligned with the axial direction of the connecting claw arm of the connecting claw specimen.

[0017] Furthermore, the inclination angle of the multi-directional loading groove is 0~60°, preferably 0~30°.

[0018] Furthermore, the centers of the bottom clamping component, clamping base plate, connecting claw specimen, loading conversion head, and top clamping component of the material testing machine are all on the same vertical line.

[0019] The present invention also provides a test method considering multi-directional coupling loading of cable-net curtain wall splice claws, using the test apparatus described in any of the above claims; the test method specifically includes the following steps: S1: Select a multi-directional loading chute with a corresponding inclination angle and install it onto the clamping base plate according to the ratio of in-plane to out-of-plane loads of the target plane; S2: Place the connector claw specimen horizontally on the arc-shaped working surface of the multi-directional loading groove using a ball head screw; S3: Connect the top of the connector claw specimen to the top clamp of the material testing machine by loading the conversion head; S4: Start the material testing machine to perform vertical displacement control loading and record the vertical load-displacement data; S5: Based on the vertical load-displacement data and the inclination angle of the multi-directional loading groove, the force-displacement relationship of the connector claw specimen in the horizontal plane is obtained through mechanical decomposition.

[0020] Further, in step S1, the method for determining the ratio of in-plane to out-of-plane loads of the target is as follows: construct a simulation model of the cable net curtain wall, simulate it under wind load, impact load and explosion load conditions, and extract the in-plane contact reaction force and out-of-plane contact reaction force between the inner wall of the glass clamping head and the ball head screw in the connector to calculate the ratio. Further, in step S5, the mechanical decomposition process is as follows: the bottom ball of the ball screw maintains sliding contact with the arc-shaped working surface of the multi-directional loading groove, and the reaction force of the arc-shaped working surface acting on the ball is along the normal direction of the working surface, so that the ratio of the in-plane force to the out-of-plane force on the ball screw is equal to the tangent of the inclination angle of the multi-directional loading groove.

[0021] Compared with the prior art, the present invention has the following technical advantages: (1) The test device of the present invention can not only accurately reproduce the real stress state of the connector claw under multi-directional load coupling, but also achieve mechanical decoupling of the in-plane and out-of-plane loading behavior of the connector claw through a unique loading design, providing a powerful test method for performance evaluation and optimization design of the connector claw.

[0022] (2) The test device of the present invention has a simple structure. By simply changing the inclined groove with different inclination angles, the fixed ratio of the in-plane load and the out-of-plane load on the connector claw specimen can be accurately set in the global coordinate system. Thus, the multi-directional coupled force state can be accurately simulated under a single vertical load, overcoming the defect of existing test devices that are difficult to reveal the true force mechanism of the connector claw.

[0023] (3) The test device of the present invention has self-aligning capability and strong resistance to error interference. The present invention innovatively designs the working surface of the inclined groove as an arc surface, so that it forms a good contact pair with the ball head screw of the connector. This design can effectively compensate for the production tolerance of the connector claw specimen and the unavoidable centering error during the test installation process. The trajectory deviation is automatically corrected by the slight sliding of the ball head screw on the arc surface, ensuring the accuracy and repeatability of the test results.

[0024] (4) In view of the stress characteristics of the splice claw under different disaster conditions, the present invention proposes a multi-directional coupling loading test device and a matching test method. The whole device is highly versatile and has low equipment cost. It can effectively simulate the ratio of the most unfavorable in-plane to out-of-plane loads transmitted from the glass panel to the splice claw under different disaster conditions.

[0025] (5) The experimental device for multi-directional coupling loading of cable mesh curtain wall splice claws in this invention can accurately capture and reproduce the deformation development process of the ball head screw, a key component inside the splice, and can effectively analyze the development degree and position change process of the splice claw damage area.

[0026] (6) The test method of the present invention is based on the vertical load-displacement curve directly measured by the material testing machine. The load-displacement curve in the plane can be directly calculated through simple mechanical decomposition, which provides clear data for quantitative analysis of the stress performance of the connecting claw under multi-directional coupled load, thereby explaining the deformation characteristics and damage development process of the claw arm more clearly from the stress mechanism. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the test apparatus of the present invention.

[0028] Figure 2 This is a schematic diagram of the test apparatus of the present invention connected to a material testing machine.

[0029] Figure 3 This is a schematic diagram of the structure of the connector claw specimen of the present invention.

[0030] Figure 4 This is a schematic diagram showing the fit between the connector claw specimen and the multi-directional loading groove of the present invention.

[0031] Figure 5 This is a schematic diagram of the loading conversion head of the present invention.

[0032] Figure 6 This is a schematic diagram of the clamping base plate of the present invention.

[0033] Figure 7 This is a top view of the clamping base plate of the present invention.

[0034] Figure 8 This is a schematic diagram of the multi-directional loading groove with an inclination angle of 0° according to the present invention.

[0035] Figure 9 This is a schematic diagram of the multi-directional loading groove with an inclination angle of 15° according to the present invention.

[0036] Figure 10 This is a schematic diagram of the multi-directional loading groove with an inclination angle of 30° according to the present invention.

[0037] Figure 11 This is the loading force-displacement data curve in Embodiment 3 of the present invention.

[0038] Explanation of markings in the diagram: 1-Connecting claw specimen, 11-Connecting claw arm, 12-Ball head screw; 2-Loading converter head, 21-Converter head plate, 22-Converter head vertical plate; 3-Clamping base plate, 31-Clamping plate flat plate, 32-Vertical connecting plate, 33-Triangular web plate; 4-Multi-directional loading chute, 41-Chute body, 42-Ear plate; 5-Material testing machine; 51-Top clamping component; 52-Bottom clamping component; 6-First fastener; 7-Second fastener. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0040] In this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] Example 1: This embodiment provides a test apparatus considering multi-directional coupled loading of cable mesh curtain wall splice claws, used to test the stress state of splice claw specimen 1 under multi-directional coupled loading. For example... Figure 1-4 As shown, the test device in this embodiment specifically includes a loading conversion head 2, a clamping base plate 3, and several multi-directional loading grooves 4 that are detachably mounted on the clamping base plate 3.

[0043] In this embodiment, the loading conversion head 2 is connected to the test specimen 1 and the top clamping member 51 of the material testing machine 5, and the clamping base plate 3 is connected to the bottom clamping member 52 of the material testing machine 5.

[0044] The connector claw specimen 1 of this embodiment includes several connector claw arms 11. The end of each connector claw arm 11 is connected to a connector with a ball head screw 12. The ball head screw 12 corresponds one-to-one with the multi-directional loading groove 4 and is placed on the arc-shaped working surface of the multi-directional loading groove 4.

[0045] In this embodiment, the working surface inclination angle of the multi-directional loading groove 4 is a replaceable design parameter. By replacing the multi-directional loading groove 4 with one of different inclination angles, the ratio of in-plane load to out-of-plane load acting on the splice claw specimen 1 can be set. Based on the vertical load-displacement curve directly measured by the material testing machine 5, the in-plane load-displacement curve can be directly calculated through simple mechanical decomposition, providing clear data for quantitative analysis of the stress performance of the splice claw specimen 1 under multi-directional coupled loads.

[0046] Example 2: This embodiment provides a test device considering multi-directional coupled loading of cable mesh curtain wall splice claws, used to test the stress state of splice claw specimen 1 under multi-directional coupled loading. The test device of this embodiment specifically includes a loading conversion head 2, a clamping base plate 3, and several multi-directional loading grooves 4 detachably mounted on the clamping base plate 3.

[0047] In this embodiment, the loading conversion head 2 is connected to the test specimen 1 and the top clamping member 51 (i.e., the clamping member of the top actuator) of the material testing machine 5, and the clamping base plate 3 is connected to the bottom clamping member 52 (i.e., the clamping member of the bottom base) of the material testing machine 5. Furthermore, in this embodiment, the centers of the bottom clamping member 52, the clamping base plate 3, the test specimen 1, the loading conversion head 2, and the top clamping member 51 of the material testing machine 5 are all on the same vertical line to ensure loading alignment and avoid eccentricity.

[0048] The connector claw specimen 1 of this embodiment includes several connector claw arms 11, and the end of each connector claw arm 11 is connected to a connector with a ball-head screw 12.

[0049] like Figure 5 As shown, the loading conversion head 2 in this embodiment includes a conversion head plate 21 and a conversion head vertical plate 22 arranged perpendicularly to the conversion head plate 21. The conversion head plate 21 is fastened to the top surface of the connecting claw specimen 1 by a plurality of first fasteners 6. The conversion head vertical plate 22 is connected to the top clamping member 51 of the material testing machine 5.

[0050] like Figure 6-7 As shown, the clamping base plate 3 in this embodiment includes a clamping plate 31 and a vertical connecting plate 32 perpendicularly arranged to the clamping plate 31. The multi-directional loading groove 4 is connected to the clamping plate 31 by a second fastener 7 (such as a high-strength bolt), and the vertical connecting plate 32 is connected to the bottom clamping member 52 of the material testing machine 5. A triangular web plate 33 connects the vertical connecting plate 32 to the clamping plate 31 on both sides.

[0051] like Figure 8-10As shown, the multi-directional loading chute 4 in this embodiment includes a chute body 41 and ear plates 42 connected to both sides of the chute body 41. The ear plates 42 are connected to the clamping base plate 3 by a second fastener 7. The centerline of the arc-shaped working surface of the multi-directional loading chute 4 is aligned with the axial direction of the claw arm 11 of the connecting claw specimen 1. The ball head screw 12 corresponds one-to-one with the multi-directional loading chute 4 and is placed on the arc-shaped working surface of the multi-directional loading chute 4. The inclination angle of the multi-directional loading chute 4 in this embodiment is 0~60°, for example, 0°, 15°, 30°, 45°, 60°. By changing the multi-directional loading chute 4 with different inclination angles, the ratio of in-plane load to out-of-plane load acting on the connecting claw specimen 1 can be set.

[0052] Example 3: This embodiment provides a test device and specific test method for considering multi-directional coupling loading of cable mesh curtain wall splice claws. The test device of this embodiment specifically includes a loading conversion head 2, a clamping base plate 3, and several multi-directional loading grooves 4 detachably mounted on the clamping base plate 3.

[0053] In this embodiment, the connector claw specimen 1 has four connector claw arms 11, and the end of each connector claw arm 11 is a connector with a ball-end screw 12. The center-to-center spacing of the claw end holes of the connector claw specimen 1 is typically between 200-300 mm. This embodiment uses a 250 mm connector claw, which is commonly used in engineering.

[0054] In this embodiment, the clamping base plate 3 is mounted on the lower base of a material testing machine (such as an MTS testing machine). To enhance structural stability and prevent deformation of the clamping plate 31 during loading, two triangular web plates 33 are provided between the vertical connecting plate 32 and the clamping plate 31 for reinforcement. The clamping plate 31 is a 500 mm × 500 mm square plane, and four sets of bolt holes are arranged on it, each set containing four holes, which are symmetrically distributed along a diagonal. The hole spacing along the diagonal is 60 mm, the hole spacing perpendicular to the diagonal is 80 mm, and the diameter of all bolt holes is 14 mm.

[0055] In this embodiment, the inclination angle of the multi-directional loading groove 4 is a replaceable core design parameter. By replacing the multi-directional loading groove 4 with different angles, the ratio of in-plane load to out-of-plane load acting on the connector claw specimen 1 can be quantified and controlled. Based on the mechanical analysis of different disaster conditions, the maximum ratio of internal force to out-of-plane force in the elastic, uncracked state of glass is approximately 0.6. Therefore, this embodiment can be equipped with multi-directional loading grooves 4 with three standard inclination angles of 0°, 15°, and 30° for selection. In this embodiment, a multi-directional loading groove 4 with an inclination angle of 30° is preferred based on the optimal ratio of in-plane force to out-of-plane force. In addition, the working surface of the multi-directional loading groove 4 is an arc surface, and the centerline of this arc surface is strictly aligned with the axial direction of the connector claw arm 11. This not only accurately transmits the load but also adaptively adjusts for minor offsets caused by processing or installation errors.

[0056] In this embodiment, four multi-directional loading chute 4s are required to correspond to the four claw arms 11 of the connecting claw specimen 1. The planar dimensions of the chute body 41 are 50 mm × 100 mm, which ensures that the ball head screw 12 of the connector has sufficient space to slide along the axial direction of the claw arm 11 during loading. Ear plates 42 with planar dimensions of 30 mm × 100 mm are provided on both sides of the chute body 41. The positions of the holes on the ear plates 42 precisely correspond to the positions of the holes on the clamping base plate 3, and are fastened together by four high-strength bolts with a diameter of 14 mm (i.e., the second fasteners 7). During installation, the connector is horizontally placed on the fixed multi-directional loading chute 4 using the ball head screw 12 of the connector, ensuring that the centerline of the claw arm 11 and the centerline of the arc-shaped working surface of the multi-directional loading chute 4 are in the same vertical plane.

[0057] In this embodiment, the loading conversion head 2 is mounted on the upper actuator of the material testing machine. The vertical plate 22 of the conversion head is fixed by the clamping parts of the actuator, and the clamping range is typically 10-80 mm; in this embodiment, the clamping depth is 60 mm. The planar dimensions of the conversion head plate 21 are 100 mm × 100 mm, and four holes with a diameter of 12 mm are arranged along the diagonal of the conversion head plate 21 for fixing the connecting claw specimen 1. The fixing connection uses high-strength bolts (i.e., the first fastener 6) with a length of 80-110 mm; in this embodiment, bolts with a length of 100 mm are selected to ensure that the connecting claw specimen 1 is tightly fitted to the bottom surface of the loading conversion head 2, so as to achieve effective force transmission.

[0058] In this embodiment, the centers of the bottom clamping member 52, the clamping base plate 3, the connecting claw specimen 1, the loading conversion head 2, and the top clamping member 51 of the material testing machine 5 are all on the same vertical line to ensure loading alignment and avoid eccentricity.

[0059] This embodiment uses the aforementioned testing apparatus to test the stress performance of the splice claw specimen 1 under multi-directional coupled loads. Specifically, this embodiment selects the S250C4 type cable net curtain wall splice claw as the test object, and uses a TF11X type splice joint in conjunction. This embodiment uses an MTS testing machine with a loading range of 100 kN for vertical displacement controlled loading to test the bearing capacity and deformation process of the four-claw splice claw under multi-directional coupled loads.

[0060] The experimental method in this embodiment includes the following steps: S1: Based on the target in-plane to out-of-plane load ratio of 0.6, select a multi-directional loading groove 4 with a corresponding inclination angle of 30° and install it onto the clamping base plate 3.

[0061] S2: Place the connector claw specimen 1 horizontally on the arc-shaped working surface of the multi-directional loading groove 4 through the ball head screw 12.

[0062] S3: Connect the top of the connector claw specimen 1 to the top clamping part 51 of the material testing machine by loading the conversion head 2.

[0063] S4: Start the material testing machine to perform vertical displacement control loading and record the vertical load-displacement data.

[0064] S5: Based on the vertical load-displacement data and the inclination angle of the multi-directional loading groove 4, the force-displacement relationship of the connector claw specimen 1 in the horizontal plane is obtained through mechanical decomposition.

[0065] Specifically, this embodiment takes a point-supported laminated glass with a thickness of 8 mm + 1.52 mm (PVB) + 8 mm and a panel size of 1500 mm × 1500 mm as an example. When the glass panel is subjected to a typical explosion load (as determined by the IOS standard) with a peak pressure of 30 kPa and a duration of 6 ms, simulation calculations (or measurements) show that the maximum ratio of the in-plane force to the out-of-plane force borne by the ball-end screw 12 is approximately 0.6. Based on this ratio, an MTS testing machine was selected and matched with a multi-directional loading chute 4 with an angle of 30° to conduct the test. The measured vertical loading force-displacement data curve is shown below. Figure 11 As shown.

[0066] Since the ball-end screw 12 maintains sliding contact on the arc-shaped working surface of the multi-directional loading groove 4, the ratio of its in-plane force to its out-of-plane force is always equal to the tangent of the groove angle. Therefore, based on the measured vertical loading force-displacement curve, and using the proportionality coefficient determined by the groove angle for mechanical decomposition, the horizontal force-displacement curve can be directly derived (see also). Figure 11 This method can accurately extract the ultimate bearing capacity of the connector claw and the critical displacement corresponding to the elastoplastic transition point under a specific load ratio.

[0067] Depend on Figure 11 It can be seen that under the action of the selected multi-directional loading groove 4, the loading force exhibits typical two-stage deformation characteristics. In the initial stage, the material is in an elastic state, and the loading force increases linearly with displacement; then it enters the elastoplastic transition stage. When the claw arm body enters the plastic state, the loading force tends to stabilize and exhibits a slow linear increase due to the influence of material stiffness hardening (strain strengthening).

[0068] In summary, compared to existing testing devices that struggle to reveal the true stress mechanism of the connector claw, the testing device of this invention features a simple structure. It can quantitatively apply in-plane and out-of-plane loads in specified proportions simply by changing the multi-directional loading grooves at different angles. Based on the raw data and preset scaling factors from the MTS testing machine, it can directly output horizontal force-displacement curves, thus providing a clearer explanation of the deformation characteristics and damage development process of the claw arm from a stress mechanism perspective. The entire device is highly versatile and cost-effective, effectively simulating the ratio of the most unfavorable in-plane to out-of-plane loads transmitted from the glass panel to the connector claw under different disaster conditions, providing a powerful testing method for the performance evaluation and optimized design of the connector claw.

[0069] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A test device considering multi-directional coupling loading of cable mesh curtain wall splice claws, characterized in that, The test device is used to test the stress state of the connector specimen (1) under multi-directional coupling loading. Specifically, it includes a loading conversion head (2), a clamping base plate (3), and several multi-directional loading grooves (4) that are detachably installed on the clamping base plate (3). The loading conversion head (2) is connected to the test specimen (1) and to the top clamping part (51) of the material testing machine (5). The clamping base plate (3) is connected to the bottom clamping part (52) of the material testing machine (5). The centers of the bottom clamping part (52), clamping base plate (3), test specimen (1), loading conversion head (2) and top clamping part (51) of the material testing machine (5) are all on the same vertical line. The connector claw specimen (1) includes several connector claw arms (11), and the end of each connector claw arm (11) is connected to a connector with a ball head screw (12). The ball head screw (12) corresponds one-to-one with the multi-directional loading groove (4) and is placed on the arc-shaped working surface of the multi-directional loading groove (4). The center line of the arc-shaped working surface of the multi-directional loading groove (4) is aligned with the axial direction of the connector claw arm (11) of the connector claw specimen (1). The inclination angle of the multi-directional loading groove (4) is 0~60°.

2. The test device for considering multi-directional coupling loading of cable mesh curtain wall splice claws according to claim 1, characterized in that, The loading conversion head (2) includes a conversion head plate (21) and a conversion head vertical plate (22) that is perpendicular to the conversion head plate (21). The conversion head plate (21) is fastened to the top surface of the connecting claw specimen (1) by a number of first fasteners (6); The vertical plate (22) of the conversion head is connected to the top clamping part (51) of the material testing machine (5).

3. The test device for multi-directional coupling loading of cable mesh curtain wall splice claws according to claim 1, characterized in that, The clamping base plate (3) includes a clamping plate flat plate (31) and a vertical connecting plate (32) arranged perpendicularly to the clamping plate flat plate (31); The multi-directional loading groove (4) is connected to the clamping plate (31) by the second fastener (7); The vertical connecting plate (32) is connected to the bottom clamping part (52) of the material testing machine (5).

4. The test device for multi-directional coupling loading of cable mesh curtain wall splice claws according to claim 3, characterized in that, A triangular web plate (33) connects the vertical connecting plate (32) to the clamping plate flat plate (31) on both sides.

5. The test device for considering multi-directional coupling loading of cable mesh curtain wall splice claws according to claim 1, characterized in that, The multi-directional loading chute (4) includes a chute body (41) and ear plates (42) connected to both sides of the chute body (41). The ear plate (42) is connected to the clamping base plate (3) by a second fastener (7).

6. A test method considering multi-directional coupling loading of cable mesh curtain wall splice claws, characterized in that, Use the test apparatus according to any one of claims 1-5; The experimental method specifically includes the following steps: S1: Based on the ratio of in-plane to out-of-plane loads, select a multi-directional loading groove (4) with a corresponding inclination angle and install it onto the clamping base plate (3); S2: Place the connector claw specimen (1) horizontally on the arc-shaped working surface of the multi-directional loading groove (4) through the ball head screw (12); S3: Connect the top of the connector claw specimen (1) to the top clamp (51) of the material testing machine by loading the conversion head (2); S4: Start the material testing machine to perform vertical displacement control loading and record the vertical load-displacement data; S5: Based on the vertical load-displacement data and the inclination angle of the multi-directional loading groove (4), the force-displacement relationship of the connector specimen (1) on the horizontal plane is obtained through mechanical decomposition.

7. The test method for considering multi-directional coupling loading of cable mesh curtain wall splice claws according to claim 6, characterized in that, In step S1, the method for determining the ratio of in-plane to out-of-plane loads of the target is as follows: construct a simulation model of the cable net curtain wall, simulate it under wind load, impact load and explosion load conditions, and extract the in-plane contact reaction force and out-of-plane contact reaction force between the inner wall of the glass clamping head and the ball head screw (12) in the connector to calculate the result.

8. A test method for considering multi-directional coupling loading of cable-net curtain wall splice claws according to claim 6, characterized in that, In step S5, the mechanical decomposition process is as follows: the bottom ball of the ball screw (12) maintains sliding contact with the arc-shaped working surface of the multi-directional loading groove (4), and the reaction force of the arc-shaped working surface acting on the ball is along the normal direction of the working surface, so that the ratio of the in-plane force to the out-of-plane force on the ball screw (12) is equal to the tangent of the inclination angle of the multi-directional loading groove (4).

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