Restraint device for steel frame beam-column joint test

Abstract

The invention discloses a restraining device for steel frame beam-column joint test, which comprises a plurality of roller mechanisms and limiting frames, the limiting frames are used for restraining the front, rear, left and right directions of a steel column in a test piece, and the roller mechanisms are fixedly mounted on the test piece and can be used for restraining the steel column in the test piece in the mechanical property test of the test piece. And under the driving of the test piece node test piece, the test piece rolls up and down along the limiting frame at the corresponding position. The restraint device is high in assembly degree and mounting speed, small in occupied space, low in environment requirement degree and simple in structure; by restraining the X-axis direction and the Y-axis direction, the translation freedom degrees in the X-axis direction and the Y-axis direction and the rotation freedom degrees around the X-axis direction and the Y-axis direction are restrained, displacement in the Z-axis direction is released, the restraining effect is obvious, reliability is high, the requirement for a test piece is small, and the device is suitable for test pieces of any size. The rolling wheels are in contact with the restraining device, the generated friction force is small, and errors caused to a test are small.

Description

Technical Field

[0001] The invention belongs to the field of steel frame beam-column node testing, and in particular relates to a restraining device for steel frame beam-column node testing. Background Art

[0002] With the continuous progress and development of human civilization and the continuous improvement of the requirements for living environment, steel structure buildings have gradually replaced the previous brick-concrete structure buildings and are widely used in the current construction industry. With the rapid development of the construction industry, new building systems are constantly emerging, which puts higher requirements on the design of steel structure nodes. As an important position for connecting specimens in the structure, the improvement of the mechanical properties of the node is an important means to ensure the overall safety of the structure. Researchers need to conduct mechanical property tests and analyses on different types of nodes. However, when the steel frame beam-column nodes are loaded without out-of-plane restraint devices, out-of-plane deformation and instability of the specimens are prone to occur, causing the test to be terminated. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a restraint device for steel frame beam-column node testing.

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

[0005] A restraining device for steel frame beam-column node testing includes a plurality of roller mechanisms and limit frames, wherein there are more than four limit frames for respectively restraining the front, rear, left and right directions of the steel columns in the test specimen, wherein the roller mechanisms are fixedly mounted on the test specimen, wherein the rollers on the roller mechanisms are respectively located in the front, rear, left and right directions of the steel columns in the test specimen, and can roll up and down along the surface of the limit frames at the corresponding positions driven by the test specimen during a force test of the test specimen.

[0006] Furthermore, the roller mechanism includes an H-shaped steel beam section, front and rear roller mechanisms, left and right roller mechanisms and a base. The H-shaped steel beam section is horizontally fixed in the middle of the test specimen and its two ends extend to the outside 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 section facing outward. A base is fixed inside the left and right ends of the H-shaped steel beam section, and front and rear roller mechanisms are horizontally arranged in front and back of the base facing outward. The left and right roller mechanisms can roll up and down along the limit frames on the left and right sides of the steel frame beam column, and the front and rear roller mechanisms can roll up and down along the limit frames on the front and back sides of the steel frame beam 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 can be adjusted, and the relative distance from the limiting frame can be adjusted by adjusting the installation position.

[0008] Furthermore, the H-shaped steel beam section includes an H-shaped steel beam, an end plate and a lug plate, two vertical circular holes are respectively left on the left and right sides of the end plate, and an oblong hole is left in the middle part of the lug plate;

[0009] The front and rear roller mechanism comprises a box-shaped steel beam, a roller and a roller shaft. The box-shaped steel beam is welded from four steel plates, and four circular holes are left on each of the two sides. The roller is installed on the outside of the box-shaped steel beam through the roller shaft and the nut. There are two rollers on the outside of the front and rear roller mechanism.

[0010] The left and right roller mechanisms include a brick-shaped steel beam, a roller and a roller shaft. The brick-shaped steel beam is welded from four steel plates, and two circular holes are left on each of the two sides. The roller is installed on the outside of the brick-shaped steel beam through the roller shaft and the nut. There is a roller on the outside of the left and right roller mechanisms.

[0011] The base is welded from five steel plates, wherein the front and rear steel plates each have two transverse long strip holes reserved therein, which are fixedly connected to the front and rear roller mechanisms 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 to the upper and lower ends of the interior of the test specimen.

[0013] Furthermore, there are six limit frames, two of which are arranged on the front and rear sides of the test specimen, and one on the left and right sides.

[0014] Furthermore, the limit frame is A-shaped, welded by three sections of I-beams and a bottom plate, and the bottom plate of the limit frame is evenly provided with ground anchor holes along the length direction, and is connected to the reaction floor through the ground anchors.

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

[0016] The present invention has a high degree of assembly and a fast installation speed. The restraint device of the present invention occupies a small space, has low environmental requirements, and has a simple device structure. By providing constraints in the X-axis and Y-axis directions, the translational freedom in the X-axis and Y-axis directions and the rotational freedom around the X-axis and Y-axis directions are suppressed, and the displacement in the Z direction is released. The support reaction force provided is large, the restraint effect is obvious, the reliability is high, the requirements for the steel frame beam-column node test specimens are small, and it is suitable for test specimens of any size. The present invention contacts the restraint device through the roller, and the contact area with the test specimen is small, the friction force generated is small, and the error caused to the test is small. The present invention itself has sufficient compression and tensile resistance, is easy to assemble and disassemble, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An overall schematic diagram of the test system using the device of the present invention;

[0018] Figure 2It is a schematic diagram of the structure after the roller mechanism is installed on the test specimen;

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

[0020] Figure 4 It is a schematic diagram of the local structure of the roller mechanism;

[0021] Figure 5 It is a schematic diagram of the structure of the front and rear roller mechanism;

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

[0023] The components represented by the reference numerals in the accompanying drawings are as follows:

[0024] 1. Roller mechanism; 2. H-shaped steel beam section; 3. Front and rear roller mechanism; 4. Left and right roller mechanism; 5. Base; 6. End plate; 7. H-shaped steel beam; 8. Ear plate; 9. Box-shaped steel beam; 10. Roller; 11. Roller; 12. Brick-shaped steel beam; 13. Test specimen; 14. Limit frame DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] The invention solves the problem of lateral instability of steel structure frame nodes and is suitable for different types of structures.

[0027] It includes multiple roller mechanisms 1 and limit frames 14. There are more than four limit frames 14, which are used to constrain the front, rear, left and right directions of the steel column in the test specimen respectively. The roller mechanism 1 is fixedly installed on the test specimen 13. The rollers on the roller mechanism 1 are respectively located in the front, rear, left and right directions of the steel column in the test specimen 13, 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 force test of the test specimen 13.

[0028] As an implementation mode, 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 its two ends extend to the outside of the left and right ends of the test specimen 13. 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 outward. A 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 outward. The left and right roller mechanisms 4 can roll up and down along the limit frames 14 on the left and right sides of the steel frame beam column, and the front and rear roller mechanisms 3 can roll up and down along the limit frames 14 on the front and back sides of the steel frame beam column.

[0029] As an implementation mode, 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 from the limiting frame 14 can be adjusted by adjusting the installation positions.

[0030] As an implementation mode, the H-shaped steel beam section 2 includes an H-shaped steel beam 7, an end plate 6 and a lug plate 8, two vertical circular holes are respectively left on the left and right sides of the end plate 6, and an oblong hole is left in the middle part of the lug plate 8;

[0031] like Figure 5 As shown, the front and rear roller mechanism 3 includes a box-shaped steel beam 9, a roller 10 and a roller shaft 11. The box-shaped steel beam is welded by four steel plates, and four circular holes are left on each of the two sides. 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.

[0032] like Figure 6 As shown, the left and right roller mechanisms 4 include 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, and two circular holes are left 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 roller 10 on the outside of the left and right roller mechanisms 4.

[0033] The base 5 is welded from five steel plates, wherein the front and rear steel plates each have two transverse long strip holes reserved therein, and are fixedly connected to the front and rear roller mechanisms 3 by bolts; the right steel plate is connected to the H-shaped steel beam section 2 by bolts.

[0034] As an implementation mode, a set of roller mechanisms 1 are fixed to the upper and lower ends of the test specimen 13 .

[0035] As an implementation manner, there are six limit frames 14, two of which are arranged on the front and rear sides of the test specimen 13, and one on the left and right sides.

[0036] As an implementation mode, the limit frame 14 is A-shaped, welded by three sections of I-beams and a bottom plate 15, and the bottom plate of the limit frame 14 is evenly provided with ground anchor holes 16 along the length direction, 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 bracket, and then the H-shaped steel beam section passes through the test specimen and is connected to the column of the test specimen through high-strength bolts. Two rows of circular holes are left at the web of the H-shaped steel 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-shaped steel beam section for connecting the left and right roller mechanisms 3;

[0038] Insert the front and rear roller mechanisms 4 into the base and install them at the screw hole positions of the H-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 at the flange of the H-beam section with high-strength bolts. Install the remaining positions according to the above method. Fix the six A-shaped limit frames on the existing reaction floor of the laboratory with ground anchors. Adjust the X-axis and Y-axis direction restraint devices to make them in close contact with the six A-shaped frames to provide lateral support in the X-axis and Y-axis directions respectively.

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

[0040] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. The restraint device for steel frame beam-column joint test is characterized by: The invention comprises a plurality of roller mechanisms (1) and limiting frames (14). There are more than four limiting frames (14) for respectively constraining the front, rear, left and right directions of a steel column in a test specimen. The roller mechanism (1) is fixedly mounted on the test specimen (13). The rollers on the roller mechanism (1) are respectively located in the front, rear, left and right directions of the steel column in the test specimen (13). The rollers can roll up and down along the surface of the limiting frames (14) at corresponding positions under the drive of the test specimen (13) during a force test on the test specimen (13).

2. The restraint device for steel frame beam-column node test according to claim 1 is characterized in that: The roller mechanism (1) comprises 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 a test specimen (13) and its two ends extend to the outside of the left and right ends of the test specimen (13); 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) and facing outward; a base (5) is fixed inside the left and right ends of the H-shaped steel beam section (2); front and rear roller mechanisms (3) are horizontally arranged in front and behind the base (5) and facing outward; the left and right roller mechanisms (4) can roll up and down along the limit frames (14) on the left and right sides of the steel frame beam column; and the front and rear roller mechanisms (3) can roll up and down along the limit frames (14) on the front and rear sides of the steel frame beam column.

3. The restraint device for steel frame beam-column node test according to claim 2 is characterized in that: 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 from the limiting frame (14) can be adjusted by adjusting the installation positions.

4. The restraint device for steel frame beam-column node test according to claim 3 is characterized in that: The H-shaped steel beam section (2) comprises an H-shaped steel beam (7), an end plate (6) and a lug plate (8), two vertical circular holes are respectively left on the left and right sides of the end plate (6), and an oblong hole is left in the middle part of the lug plate (8); The front and rear roller mechanism (3) comprises a box-shaped steel beam (9), a roller (10) and a roller shaft (11); the box-shaped steel beam is welded from four steel plates, and four circular holes are left on each of the two side surfaces; the roller is installed on the outer side of the box-shaped steel beam through the roller shaft and a nut; there are two rollers (10) on the outer side of the front and rear roller mechanism (3); The left and right roller mechanisms (4) comprise 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, and two circular holes are left on each of the two side surfaces; the roller (10) is mounted on the outer side of the brick-shaped steel beam through the roller shaft (11) and a nut, and there is a roller (10) on the outer side of the left and right roller mechanisms (4); The base (5) is welded from five steel plates, wherein the front and rear steel plates each have two transverse long strip holes reserved therein and are fixedly connected to the front and rear roller mechanisms (3) by bolts; the right side steel plate is connected to the H-shaped steel beam section (2) by bolts.

5. The restraint device for steel frame beam-column node test according to claim 1, characterized in that: A set of roller mechanisms (1) are fixed at both the upper and lower ends of the test specimen (13).

6. The restraint device for steel frame beam-column node test according to claim 2, characterized in that: There are six limit frames (14), two of which are arranged on the front and rear sides of the test specimen (13), and one on the left and right sides.

7. The restraint device for steel frame beam-column node test according to claim 1, characterized in that: The limiting frame (14) is A-shaped and is welded from three sections of I-beams and a bottom plate (15). The bottom plate of the limiting frame (14) is evenly provided with ground anchor holes (16) along the length direction and is connected to the reaction floor through the ground anchors.

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