K-shaped node test device capable of realizing tension and compression

Abstract

The utility model discloses a K-shaped node test device capable of realizing tension and compression, and belongs to the technical field of steel tube structure test platforms. The device comprises a counter-force support, a main pipe tension and compression loading device and a branch pipe tension and compression loading device, wherein the main pipe tension and compression loading device and the branch pipe tension and compression loading device are arranged in the counter-force support; the main pipe tension and compression loading device comprises a first jack, a belleville spring arranged at the output end of the first jack and a first force sensor arranged between the output end of the first jack and the belleville spring; the K-shaped node comprises a main pipe and a branch pipe, the fixed end of the main pipe is fixed on the counter-force bracket, and the loading end is connected with a belleville spring; the fixed ends of the two branch pipes are fixed to the main pipe, and the loading ends of the two branch pipes are fixedly connected with the counter-force support through the branch pipe pulling and pressing loading devices. The method has the advantages that the K-shaped nodes forming the pipe truss serve as research objects, influences of parameters such as geometric dimensions and impact energy are considered, and research on the complex stress states of the main pipe and the branch pipes in which the main pipe of the K-shaped nodes is pulled (pressed), the two branch pipes are pulled (pressed) at the same time or the two branch pipes are pulled and pressed respectively is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of steel pipe structure test platforms, and specifically relates to a K-shaped joint test device capable of realizing tension and compression. Background Art

[0002] The joint part of a steel pipe structure is an important component of the pipe structure and also the focus of research. Since the joint is an important load-transferring part, the stress is relatively complex and stress concentration is likely to occur. Currently, the research on joints in steel pipe structures mainly focuses on the static bearing capacity, impact resistance, hysteretic performance, etc. of unstrengthened or strengthened joints.

[0003] During the actual service process of a steel pipe structure, due to its own load and the loads of various production equipment, the main and branch pipes at the joint part often bear complex forces. However, there are few studies on the impact resistance of K-joints under complex stress states. Conducting research on the impact resistance of K-shaped pipe joints under complex stress states and revealing the impact failure modes and impact resistance bearing capacities of K-shaped pipe joints under complex axial forces can provide a reliable basis for the design and reinforcement of pipe joints in steel pipe structures in engineering, which has great practical engineering significance. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a K-shaped joint test device capable of realizing tension and compression. Taking the K-shaped joints that make up the pipe truss as the research object, considering the influence of parameters such as geometric dimensions and impact energy, experimental research is carried out on four complex stress states of the main and branch pipes of the K-shaped joint, namely, the main pipe is in tension (compression), the two branch pipes are in tension (compression) at the same time, or are in tension and compression respectively, so as to solve at least one technical problem involved in the background art.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] The embodiments of this application provide a K-shaped joint test device capable of realizing tension and compression, including a reaction support and a main pipe tension-compression loading device and a branch pipe tension-compression loading device arranged in the reaction support, where:

[0007] The main pipe tension-compression loading device includes a first jack, a disc spring arranged at the output end of the first jack, and a first force sensor arranged between the output end of the first jack and the disc spring;

[0008] The K-shaped joint includes a main pipe and two bifurcated branch pipes. The fixed end of the main pipe is fixed to the reaction support, and the loading end is connected to the disc spring; the fixed ends of the two branch pipes are respectively fixed to the main pipe, and the loading ends are respectively fixedly connected to the reaction support through the branch pipe tension-compression loading device.

[0009] Optionally, the branch pipe tension and compression loading device includes a branch pipe tension applying device and a branch pipe pressure applying device, and the loading end of the branch pipe is fixedly connected to the reaction support through the branch pipe tension applying device or the branch pipe pressure applying device.

[0010] Optionally, the branch pipe tension applying device includes a first screw rod and a second force sensor. One end of the first screw rod is fixedly connected to the loading end of the branch pipe by screwing, and the other end is connected to the reaction support through the second force sensor.

[0011] Optionally, the branch pipe pressure applying device includes a second jack, a second screw rod, and a third force sensor. The second jack is fixedly arranged on the reaction support. One end of the second screw rod is fixedly connected to the loading end of the branch pipe by screwing, and the other end is connected to the output end of the second jack through the third force sensor.

[0012] Optionally, the reaction support includes two bases arranged side by side at intervals, a first support arranged at the top of one of the bases, and a second support arranged at the top of the other base. The fixed end of the main pipe is fixed to the first support, the second support is located between the loading end of the main pipe and the disc spring, and the main pipe tension and compression loading device further includes a connecting rod that connects the loading end of the main pipe and the disc spring and can move left and right. The connecting rod is assembled in the second support.

[0013] Optionally, the reaction support further includes a diagonal brace with one end fixed to the base and arranged obliquely. The branch pipe tension and compression loading device is fixedly arranged on the diagonal brace.

[0014] Optionally, the diagonal brace includes two concrete-filled steel tubes arranged side by side at intervals. The end of the first screw rod away from the branch pipe passes through the gap between the two concrete-filled steel tubes and exposes on the surface of the concrete-filled steel tube away from the branch pipe to form an exposed end. The branch pipe tension applying device further includes a backing plate sleeved on the exposed end, and the second force sensor is arranged between the backing plate and the concrete-filled steel tube.

[0015] Optionally, an end plate is arranged at the loading end of the branch pipe, and bolts abutting against the end plate are screwed on the first screw rod and the second screw rod.

[0016] Optionally, the reaction support further includes a plurality of transverse screw rods with one end fixed to the first support or the second support and the other end fixed to the first jack.

[0017] The beneficial effects of the embodiments of the present application are as follows:

[0018] Taking the K-shaped joint that composes the tubular truss as the research object, considering the influence of parameters such as geometric dimensions and impact energy, the research on four complex force states of the main and branch pipes, namely, the main pipe in tension (compression), both branch pipes in tension (compression) simultaneously, or in tension and compression respectively, has been realized. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0020] Figure 1 Schematic diagram of the structure of the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 1 under the condition that the main pipe is in compression and the branch pipes are in tension on the left and compression on the right;

[0021] Figure 2 Schematic diagram of the structure of the diagonal brace in Embodiment 1 of the present application;

[0022] Figure 3 Schematic diagram of the structure of the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 2 under the condition that the main pipe is in compression and the branch pipes are in compression;

[0023] Figure 4 Schematic diagram of the structure of the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 3 under the condition that the main pipe is in tension and the branch pipes are in tension on the left and compression on the right;

[0024] Figure 5 Schematic diagram of the structure of the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 4 under the condition that the main pipe is in tension and the branch pipes are in compression. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0026] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0027] Embodiment 1

[0028] Please refer to Figure 1 As shown, Embodiment 1 of this application provides a K-shaped joint test device capable of realizing tension and compression, including a reaction support and a main pipe tension and compression loading device and a branch pipe tension and compression loading device arranged in the reaction support. The K-shaped joint includes a main pipe 1 and two branch pipes 2 arranged in a forked manner. Specifically, the two branch pipes 2 are forked at 90°. The main pipe tension and compression loading device is used to apply tension or pressure to the main pipe 1; the branch pipe tension and compression loading device is used to apply tension or pressure to the branch pipe 2.

[0029] The reaction support includes two bases 3 arranged side by side at intervals, a first support 4 arranged at the top of one of the bases 3, a second support 5 arranged at the top of the other base 3, and a diagonal brace 6 with one end fixed to the base 3 and inclined.

[0030] Specifically, one diagonal brace 6 is provided on the inner side of each of the two bases 3.

[0031] Combined with Figure 2 As shown, the diagonal brace 6 includes two concrete-filled steel tubes 61 arranged side by side at intervals.

[0032] The main pipe tension and compression loading device includes a first jack 7, a disc spring 8 arranged at the output end of the first jack 7, and a first force sensor 9 arranged between the output end of the first jack 7 and the disc spring 8.

[0033] The fixed end of the main pipe 1 is fixed to the first support 4, the second support 5 is located between the loading end of the main pipe 1 and the disc spring 8, and the main pipe tension and compression loading device further includes a connecting rod 10 connecting the loading end of the main pipe 1 and the disc spring 8 and capable of moving left and right. The connecting rod 10 is assembled in the second support 5 and can slide left and right in the second support 5.

[0034] Specifically, end plates 11 are provided at both ends of the main pipe 1, and the main pipe 1 is fixedly connected to the first support 4 and the connecting rod 10 respectively through the end plates 11 at both ends.

[0035] The reaction support further includes four transverse screw rods 12 with one end fixed to the first support 4 and the other end fixed to the first jack 7, and the four transverse screw rods 12 are arranged in a rectangle.

[0036] The fixed ends of the two branch pipes 2 are respectively fixed to the main pipe 1, and the loading ends are respectively fixedly connected to the reaction support through the branch pipe tension and compression loading device.

[0037] The branch pipe tension and compression loading device includes a branch pipe tension applying device and a branch pipe pressure applying device. The loading end of one of the branch pipes 2 is fixedly connected to the reaction support through the branch pipe tension applying device, and the loading end of the other branch pipe 2 is fixedly connected to the reaction support through the branch pipe pressure applying device.

[0038] The branch pipe tension applying device includes a first screw rod 13, a second force sensor 14 and a backing plate 15. One end of the first screw rod 13 is fixedly connected to the loading end of the branch pipe 2 by screwing, and the other end is connected to the diagonal brace 6 through the second force sensor 14.

[0039] The end of the first screw rod 13 away from the branch pipe 2 passes through the gap between the two concrete-filled steel tubes 61 and exposes on the surface of the concrete-filled steel tube 61 away from the branch pipe 2 to form an exposed end. The backing plate 15 is sleeved on the exposed end and fixed by a bolt 16, and the second force sensor 14 is arranged between the backing plate 15 and the concrete-filled steel tube 61.

[0040] The branch pipe pressure applying device includes a second jack 17, a second screw rod 18 and a third force sensor 19. The second jack 17 is fixedly arranged on the reaction support. One end of the second screw rod 18 is fixedly connected to the loading end of the branch pipe 2 by screwing, and the other end is connected to the output end of the second jack 17 through the third force sensor 19. The pressure can be applied to the branch pipe 2 through the second jack 17.

[0041] An end plate 21 is provided at the loading end of the branch pipe 2. Bolts 16 abutting against the end plate 21 are screwed on the first screw rod 13 and the second screw rod 18. By screwing the bolts 16, the tension can be applied to the branch pipe 2.

[0042] Therefore, in the present Embodiment 1, the pressure can be applied to the main pipe 1, and at the same time, the pressure can be applied to one of the branch pipes 2, and the tension can be applied to the other branch pipe 2.

[0043] The working principle of the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 1 of the present application is as follows:

[0044] The axial force of the main pipe 1 is applied by jointly tensioning the transverse screw 12 and the first jack 7. When the axial force of the main pipe is loaded, the disc spring 8 is compressed, its elasticity increases, and at the same time, the force is transmitted to the main pipe 1 to complete the application of the axial force of the main pipe. The pre-applied axial force of the branch pipe 2 is small, and the pressure and tension are applied by tightening the bolt 16. After the main pipe 1 is impacted, the main pipe 1 deforms, axially contracts rapidly, the main pipe 1 and the device vibrate, and the disc spring 8 can expand and contract and store elastic potential energy during this process. Therefore, it can ensure the continuity of the axial force of the main pipe 1 during the impact process. At the same time, during the entire impact process, the change of the axial force is also recorded and saved through the force sensor and the data acquisition system.

[0045] Embodiment 2

[0046] Please refer to Figure 3 As shown, the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 2 of the present application is different from the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 1 in that: both of the two branch pipes 2 are connected to the diagonal brace 6 through the pipe pressure application device.

[0047] Therefore, in Embodiment 2, it is possible to apply pressure to the main pipe 1 and at the same time apply pressure to the two branch pipes 2.

[0048] Embodiment 3

[0049] Please refer to Figure 4 As shown, the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 3 of the present application is different from the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 1 in that: one end of the four transverse screws 12 is fixed to the second support 5, and the other end is fixed to the first jack.

[0050] Therefore, in Embodiment 3, it is possible to apply tension to the main pipe 1, apply pressure to one of the branch pipes 2, and apply tension to the other branch pipe 2.

[0051] Embodiment 4

[0052] Please refer to Figure 5 As shown, the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 4 of the present application is different from the K-shaped joint test device capable of realizing tension and compression provided in Embodiment 1 in that: one end of the four transverse screws 12 is fixed to the second support 5, and the other end is fixed to the first jack. In addition, both of the two branch pipes 2 are connected to the diagonal brace 6 through the pipe pressure application device.

[0053] Therefore, in the present Embodiment 4, it is possible to apply a tensile force to the main pipe 1 while applying a pressure to the two branch pipes 2.

[0054] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0055] In addition, it should be pointed out that the scope of the methods and systems in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0056] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A K-shaped joint test device capable of realizing tension and compression, characterized in that It includes a reaction support and a main pipe tension-compression loading device and a branch pipe tension-compression loading device arranged in the reaction support, wherein: The main pipe tension-compression loading device includes a first jack, a disc spring arranged at the output end of the first jack, and a first force sensor arranged between the output end of the first jack and the disc spring; The K-shaped joint includes a main pipe and two branch pipes arranged in a bifurcated manner. The fixed end of the main pipe is fixed to the reaction support, and the loading end is connected to the disc spring; the fixed ends of the two branch pipes are respectively fixed to the main pipe, and the loading ends are respectively fixedly connected to the reaction support through the branch pipe tension-compression loading device.

2. The test device for the K-shaped joint capable of realizing tension and compression according to claim 1, characterized in that, The branch pipe tension-compression loading device includes a branch pipe tension applying device and a branch pipe pressure applying device. The loading end of the branch pipe is fixedly connected to the reaction support through the branch pipe tension applying device or the branch pipe pressure applying device.

3. The test device for the K-shaped joint capable of realizing tension and compression according to claim 2, characterized in that, The branch pipe tension applying device includes a first screw rod and a second force sensor. One end of the first screw rod is fixedly connected to the loading end of the branch pipe by screwing, and the other end is connected to the reaction support through the second force sensor.

4. The test device for K-shaped joints capable of realizing tension and compression according to claim 3, wherein The branch pipe pressure applying device includes a second jack, a second screw rod, and a third force sensor. The second jack is fixedly arranged on the reaction support. One end of the second screw rod is fixedly connected to the loading end of the branch pipe by screwing, and the other end is connected to the output end of the second jack through the third force sensor.

5. The test device for the K-shaped joint capable of realizing tension and compression according to claim 4, characterized in that, The reaction support includes two bases arranged side by side at intervals, a first support arranged at the top of one of the bases, and a second support arranged at the top of the other base. The fixed end of the main pipe is fixed to the first support, the second support is located between the loading end of the main pipe and the disc spring, and the main pipe tension-compression loading device further includes a connecting rod connecting the loading end of the main pipe and the disc spring and capable of moving left and right. The connecting rod is assembled in the second support.

6. The test device for the K-shaped joint capable of realizing tension and compression according to claim 5, characterized in that, The reaction support further includes a diagonal brace with one end fixed to the base and arranged obliquely. The branch pipe tension-compression loading device is fixedly arranged on the diagonal brace.

7. The test device for the K-shaped joint capable of realizing tension and compression according to claim 6, characterized in that, The diagonal brace includes two concrete-filled steel tubes arranged side by side at intervals. The end of the first screw rod away from the branch pipe passes through the gap between the two concrete-filled steel tubes and exposes on the surface of the concrete-filled steel tube away from the branch pipe to form an exposed end. The branch pipe tension applying device further includes a backing plate sleeved on the exposed end, and the second force sensor is arranged between the backing plate and the concrete-filled steel tube.

8. The test device for the K-shaped joint capable of realizing tension and compression according to claim 7, wherein An end plate is arranged at the loading end of the branch pipe, and bolts abutting against the end plate are screwed on the first screw rod and the second screw rod.

9. The test device for the K-shaped joint capable of realizing tension and compression according to claim 5, characterized in that, The reaction support further includes a plurality of transverse screw rods with one end fixed to the first support or the second support and the other end fixed to the first jack.

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