Restraint device for steel frame beam-column joint test

Abstract

The application discloses a restraint device for steel frame beam-column joint test, which comprises a plurality of roller mechanisms and limiting racks, the limiting racks are used for respectively restraining the front, rear, left and right directions of the steel column in the test specimen, the roller mechanisms are fixedly installed on the test specimen and can roll up and down along the limiting racks at the corresponding positions under the driving of the test specimen joint specimen in the mechanical property test of the test specimen, the restraint device has high assembly degree, fast installation speed, small space occupation, low environmental requirement and simple structure, the restraint device provides restraint in the X-axis and Y-axis directions, restrains the translational freedom in the X-axis and Y-axis directions and the rotational freedom around the X-axis and Y-axis directions, releases the displacement in the Z-axis direction, has obvious restraint effect, high reliability, small requirement on the test specimen and is applicable to test specimens of any size, the roller is contacted with the restraint device, the friction force is small, and the error caused by the test is small.

Description

Technical Field

[0001] This invention belongs to the field of steel frame beam-column joint testing, and in particular relates to a constraint device for steel frame beam-column joint testing. Background Technology

[0002] With the continuous progress and development of human civilization and the increasing demands for living environments, steel structure buildings are gradually replacing the older brick-concrete structures and are widely used in the current construction industry. As the construction industry develops rapidly, new building systems are constantly emerging, placing higher demands on the design of steel structure joints. As crucial connections between structural specimens, improving the mechanical properties of joints is essential for ensuring the overall structural safety. Researchers need to conduct mechanical performance tests and analyses on different types of joints. However, when steel frame beam-column joints are loaded without out-of-plane constraints, out-of-plane deformation and instability of the specimens can easily occur, forcing the termination of the experiment. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a constraint device for testing steel frame beam-column joints.

[0004] The constraint device for the steel frame beam-column joint test includes the following steps:

[0005] The constraint device for the steel frame beam-column joint test includes multiple roller mechanisms and limiting frames. There are four or more limiting frames, which are used to constrain the steel column in the test specimen in the front, back, left and right directions respectively. The roller mechanisms are fixedly installed on the test specimen. The rollers on the roller mechanisms are located in the front, back, left and right directions of the steel column in the test specimen, and can roll up and down along the surface of the limiting frame at the corresponding position under the action of the test specimen during the stress test.

[0006] Furthermore, the roller mechanism includes an H-shaped steel beam segment, front and rear roller mechanisms, left and right roller mechanisms, and a base. The H-shaped steel beam segment is horizontally fixed in the middle of the test specimen and extends to the outer sides of the left and right ends of the test specimen. Left and right roller mechanisms are horizontally arranged above and below the left and right ends of the H-shaped steel beam segment, facing outwards. A base is fixed inside the left and right ends of the H-shaped steel beam segment. Front and rear roller mechanisms are horizontally arranged in front and behind the base, facing outwards. The left and right roller mechanisms can roll up and down along the limiting frames on the left and right sides of the steel frame beam and column, and the front and rear roller mechanisms can roll up and down along the limiting frames on the front and rear sides of the steel frame beam and column.

[0007] Furthermore, the installation positions of the front and rear roller mechanisms and the left and right roller mechanisms on the H-shaped steel beam section are adjustable, and the relative distance with the limiting frame can be adjusted by adjusting the installation position.

[0008] Furthermore, the H-shaped steel beam segment includes an H-shaped steel beam, an end plate, and an ear plate. The end plate has two vertical circular holes on each of its left and right sides, and the ear plate has an elongated hole in the middle.

[0009] The front and rear roller mechanism includes a box-shaped steel beam, rollers, and roller shafts. The box-shaped steel beam is welded from four steel plates, with four circular holes on each side. The rollers are installed on the outside of the box-shaped steel beam via roller shafts and nuts. There are two rollers on the outside of the front and rear roller mechanism.

[0010] The left and right roller mechanism includes a brick-shaped steel beam, rollers and roller shafts. The brick-shaped steel beam is welded from four steel plates, with two circular holes on each side. The rollers are installed on the outside of the brick-shaped steel beams via roller shafts and nuts. There is a total of one roller on the outside of the left and right roller mechanism.

[0011] The base is welded from five steel plates, with two transverse elongated holes pre-drilled in each of the front and rear steel plates, which are fixedly connected to the front and rear roller mechanism by bolts; the right steel plate is connected to the H-shaped steel beam section by bolts.

[0012] Furthermore, a set of roller mechanisms is fixed at both the upper and lower ends of the test specimen.

[0013] Furthermore, the limiting frame has six parts, with two on the front and back of the test specimen and one on the left and right sides.

[0014] Furthermore, the limiting frame is A-shaped and is welded together from three sections of I-beams and a base plate. The base plate of the limiting frame is provided with ground anchor holes evenly distributed along its length, and is connected to the reaction floor through ground anchors.

[0015] The present invention has the following beneficial technical effects:

[0016] This invention features a high degree of modularity and rapid installation. The constraint device described herein occupies little space, has low environmental requirements, and a simple structure. By providing constraints in the X and Y axes, it suppresses translational degrees of freedom in these directions and rotational degrees of freedom about the X and Y axes, while releasing displacement in the Z direction. It provides a large support reaction force, resulting in a significant constraint effect and high reliability. It requires small test specimens for steel frame beam-column joints and is suitable for test specimens of any size. The invention uses rollers to contact the constraint device, resulting in a small contact area with the test specimen, low friction, and minimal experimental error. The invention itself possesses sufficient compressive and tensile strength, is easy to assemble and disassemble, and can be reused. Attached Figure Description

[0017] Figure 1 A general schematic diagram of the test system using the apparatus of the present invention;

[0018] Figure 2This is a schematic diagram of the roller mechanism after it has been installed on the test specimen.

[0019] Figure 3 A schematic diagram of the overall structure after the limit frame and roller mechanism are installed;

[0020] Figure 4 This is a partial structural diagram of the roller mechanism;

[0021] Figure 5 This is a schematic diagram of the front and rear roller mechanism.

[0022] Figure 6 This is a schematic diagram of the left and right roller mechanism.

[0023] The components represented by the numbers in the attached diagram are as follows:

[0024] 1. Roller mechanism; 2. H-beam segment; 3. Front and rear roller mechanism; 4. Left and right roller mechanism; 5. Base; 6. End plate; 7. H-beam; 8. Ear plate; 9. Box-type steel beam; 10. Roller; 11. Roller shaft; 12. Brick-type steel beam; 13. Test specimen; 14. Limiting frame Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] This invention solves the problem of lateral instability at steel frame nodes and is applicable to different types of structures.

[0027] It includes multiple roller mechanisms 1 and limiting frames 14. There are four or more limiting frames 14, which are used to constrain the steel column in the test specimen in the front, back, left and right directions respectively. The roller mechanisms 1 are fixedly installed on the test specimen 13. The rollers on the roller mechanisms 1 are located in the front, back, left and right directions of the steel column in the test specimen 13 respectively, and can roll up and down along the surface of the limiting frame 14 at the corresponding position under the drive of the test specimen 13 during the stress test of the test specimen 13.

[0028] In one embodiment, the roller mechanism 1 includes an H-shaped steel beam segment 2, front and rear roller mechanisms 3, left and right roller mechanisms 4, and a base 5. The H-shaped steel beam segment 2 is horizontally fixed in the middle of the test specimen 13 and extends to the outer sides of the left and right ends of the test specimen 13. The left and right roller mechanisms 4 are horizontally arranged above and below the left and right ends of the H-shaped steel beam segment 2 facing outwards. The base 5 is fixed inside the left and right ends of the H-shaped steel beam segment 2. The front and rear roller mechanisms 3 are horizontally arranged in front and behind the base 5 facing outwards. The left and right roller mechanisms 4 can roll up and down along the limiting frames 14 on the left and right sides of the steel frame beam column. The front and rear roller mechanisms 3 can roll up and down along the limiting frames 14 on the front and rear sides of the steel frame beam column.

[0029] In one implementation, the installation positions of the front and rear roller mechanisms 3 and the left and right roller mechanisms 4 on the H-shaped steel beam section 2 are adjustable, and the relative distance with the limiting frame 14 can be adjusted by adjusting the installation position.

[0030] In one embodiment, the H-shaped steel beam segment 2 includes an H-shaped steel beam 7, an end plate 6, and an ear plate 8. The end plate 6 has two vertical circular holes on each of its left and right sides, and the ear plate 8 has an elongated hole in the middle.

[0031] like Figure 5 As shown, the front and rear roller mechanism 3 includes a box-shaped steel beam 9, rollers 10 and roller shafts 11. The box-shaped steel beam is welded from four steel plates, with four circular holes on each side. The rollers are installed on the outside of the box-shaped steel beam via roller shafts and nuts. There are two rollers 10 on the outside of the front and rear roller mechanism 3.

[0032] like Figure 6 As shown, the left and right roller mechanism 4 includes a brick-shaped steel beam 12, rollers 10 and roller shafts 11. The brick-shaped steel beam 12 is welded from four steel plates, with two circular holes on each side. The rollers 10 are installed on the outside of the brick-shaped steel beam through the roller shafts 11 and nuts. There is a total of one roller 10 on the outside of the left and right roller mechanism 4.

[0033] The base 5 is welded from five steel plates, with two transverse elongated holes pre-drilled in each of the front and rear steel plates, which are fixedly connected to the front and rear roller mechanism 3 by bolts; the right side steel plate is connected to the H-shaped steel beam section 2 by bolts.

[0034] As one implementation method, a set of roller mechanisms 1 are fixed at both the upper and lower ends of the test specimen 13.

[0035] In one implementation, the limiting frame 14 has six parts, with two parts each on the front and back of the test specimen 13, and one part on each of the left and right sides.

[0036] In one embodiment, the limiting frame 14 is A-shaped and is welded together from three sections of I-beams and a base plate 15. The base plate of the limiting frame 14 is provided with ground anchor holes 16 evenly along its length and is connected to the reaction floor through ground anchors.

[0037] like Figure 2-4 As shown, before the test, the test specimen is first installed on the two crossbeams of the existing test support. Then, the H-beam section passes through the test specimen and is connected to the column of the test specimen by high-strength bolts. Two rows of round holes are left at the web position of the H-beam section for connecting the front and rear roller mechanisms 4. Two ear plates are welded at the upper and lower flange positions of the H-beam section for connecting the left and right roller mechanisms 3.

[0038] Fit the front and rear roller mechanisms 4 into the base and install them together at the bolt hole positions of the H-shaped steel beam section. Then connect the base and the front and rear roller mechanisms 4 with high-strength bolts. Finally, install and fix the rollers on the front and rear roller mechanisms 4. Fix the left and right roller mechanisms 3 to the flange of the H-shaped steel beam section with high-strength bolts. Install the remaining positions in the same way. Fix the six A-shaped limit frames to the existing reaction floor of the laboratory with ground anchors. Adjust the X-axis and Y-axis constraint devices to make them in close contact with the six A-shaped frames, providing lateral support in the X-axis and Y-axis directions respectively.

[0039] like Figure 1 As shown, during the test, pressure is applied to the test specimen in the vertical direction. The A-shaped limiting frame constrains the test specimen in all four directions (front, back, left, and right). The test specimen can move in the vertical direction and slide on the surface of the A-shaped limiting frame through the roller mechanism during the movement.

[0040] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A constraint device for testing beam-column joints in steel frames, characterized in that, It includes multiple roller mechanisms (1) and limit frames (14). There are more than four limit frames (14) used to constrain the steel column in the test specimen in the front, back, left and right directions respectively. The roller mechanism (1) is fixedly installed on the test specimen (13). The rollers on the roller mechanism (1) are located in the front, back, left and right directions of the steel column in the test specimen (13) respectively, and can roll up and down along the surface of the limit frame (14) at the corresponding position under the drive of the test specimen (13) during the stress test of the test specimen (13). The roller mechanism (1) includes an H-shaped steel beam section (2), front and rear roller mechanisms (3), left and right roller mechanisms (4) and a base (5). The H-shaped steel beam section (2) is horizontally fixed in the middle of the test specimen (13) and extends to the outer sides of the left and right ends of the test specimen (13). The left and right roller mechanisms (4) are horizontally arranged above and below the left and right ends of the H-shaped steel beam section (2) facing outwards. The base (5) is fixed inside the left and right ends of the H-shaped steel beam section (2). The front and rear roller mechanisms (3) are horizontally arranged in front and behind the base (5) facing outwards. The left and right roller mechanisms (4) can roll up and down along the limiting frames (14) on the left and right sides of the steel frame beam column. The front and rear roller mechanisms (3) can roll up and down along the limiting frames (14) on the front and rear sides of the steel frame beam column. The installation positions of the front and rear roller mechanisms (3) and the left and right roller mechanisms (4) on the H-shaped steel beam section (2) can be adjusted, and the relative distance with the limit frame (14) can be adjusted by adjusting the installation position; The H-shaped steel beam section (2) includes an H-shaped steel beam (7), an end plate (6) and an ear plate (8). The end plate (6) has two vertical round holes on each of its left and right sides, and the ear plate (8) has an elongated hole in the middle. The front and rear roller mechanism (3) includes a box-shaped steel beam (9), rollers (10) and roller shafts (11). The box-shaped steel beam is welded from four steel plates, with four circular holes on each side. The rollers are installed on the outside of the box-shaped steel beam through roller shafts and nuts. There are two rollers (10) on the outside of the front and rear roller mechanism (3). The left and right roller mechanism (4) includes a brick-shaped steel beam (12), a roller (10) and a roller shaft (11). The brick-shaped steel beam (12) is welded from four steel plates, with two circular holes on each side. The roller (10) is installed on the outside of the brick-shaped steel beam through the roller shaft (11) and a nut. There is a total of one roller (10) on the outside of the left and right roller mechanism (4). The base (5) is welded from five steel plates, with two transverse elongated holes reserved in each of the front and rear steel plates, which are fixedly connected to the front and rear roller mechanism (3) by bolts; the right side steel plate is connected to the H-shaped steel beam section (2) by bolts.

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