Geometrically compatible buckling restraint system for assembled steel pipe column ends

Abstract

The present invention provides a geometrically compatible assembled steel pipe column end buckling restraint system, which is composed of two buckling restraint devices hooped at both ends of a specimen; the specimen adopts a rectangular cross-section steel pipe; each of the two buckling restraint devices includes four non-adjustable steel blocks, four adjustable steel blocks and four high-strength screws, the four non-adjustable steel blocks are arranged and attached to the four corners of the specimen, the four adjustable steel blocks are respectively arranged between two adjacent non-adjustable steel blocks and attached to the side of the specimen, and one non-adjustable steel block, one adjustable steel block and another non-adjustable steel block arranged in sequence on each side of the specimen are connected by one high-strength screw. The present invention is a geometrically compatible assembled steel pipe column end buckling restraint system, which can adapt to the repeated use of rectangular cross-section specimens of different sizes to avoid local crushing of the ends of rectangular cross-section steel pipe short columns during compression tests.

Description

Technical Field

[0001] The invention relates to the field of compression test auxiliary devices for rectangular cross-section steel pipe short columns, and in particular to a geometrically compatible assembled steel pipe column end buckling restraint system. Background Art

[0002] In the compression test of rectangular cross-section steel tube short columns, the steel tube is prone to local buckling and crushing at the ends under the action of pressure at both ends, so the true mechanical properties of the steel tube short columns cannot be obtained from the test.

[0003] Steel tube short columns are the main components that bear pressure, so it is necessary to conduct compression tests on them to obtain their mechanical properties under axial compression for their application in engineering or research fields. However, since steel tubes are generally thin-walled components, in axial compression tests, thin-walled steel tube short columns are prone to local buckling at the ends under axial pressure, which is manifested as local collapse at both ends of the steel tube short column due to bulging, thus affecting the results of mechanical tests and the determination of related data.

[0004] Therefore, in order to obtain the true mechanical properties of rectangular steel tube short columns in axial compression tests, appropriate protection measures must be taken for the steel tube short column components to prevent them from being locally crushed under axial compression. Currently, the existing implementation solutions are:

[0005] The welded base plate method welds both ends of the steel pipe short column to the steel plate. The welded steel plate can restrain the end section of the short column.

[0006] The hoop constraint method is mainly used for short circular steel pipe columns, and steel hoop and bolts are used to constrain the end section of the short circular steel pipe column.

[0007] In view of the problem that the ends of rectangular steel tube short columns are prone to local buckling under axial compression tests, an effective restraint device should be installed at the ends of the steel tube columns. A reasonable restraint device should have good applicability and economy to meet the requirements of a large number of repeated mechanical tests. However, the existing technology has the following defects: poor geometric compatibility, the restraint device can only be targeted at a specific cross-section, and cannot adapt to the changes in cross-sectional dimensions in different tests; high processing accuracy requirements and low error tolerance. For example, the welding base plate method is relatively difficult when welding the base plate of the steel tube short column, and the accuracy requirements are high. It will also weaken the cross-section of the steel tube, affecting the bearing capacity of the steel tube in the test; the restraint device is difficult to reuse, and the restraint device usually needs to be replaced with a new device after a set of tests, and cannot be reused, and the economic benefits are not high. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, the present invention provides a geometrically compatible assembled steel pipe column end buckling restraint system, which can avoid local crushing of the ends of rectangular cross-section steel pipe short columns during compression tests.

[0009] In order to achieve the above-mentioned purpose, the present invention provides a geometrically compatible assembled steel pipe column end buckling restraint system, including two buckling restraint devices clamped on both ends of a specimen; the specimen adopts a rectangular cross-section steel pipe; each of the two buckling restraint devices includes four non-adjustable steel blocks, four adjustable steel blocks and four high-strength screws, the four non-adjustable steel blocks are arranged and fitted to the four corners of the specimen, the four adjustable steel blocks are respectively arranged between two adjacent non-adjustable steel blocks and fit the side of the specimen, and one non-adjustable steel block, one adjustable steel block and another non-adjustable steel block arranged in sequence on each side of the specimen are connected by one high-strength screw.

[0010] Preferably, the non-adjustable steel block includes a notch, a first end face, a second end face, a third end face and a fourth end face; the notch is formed adjacent to the first end face and the second end face and fits with the four corners of the specimen; the first end face is perpendicular to the second end face, the third end face is parallel to the first end face, and the fourth end face is parallel to the second end face; a screw hole is formed on the first end face, and a first through hole is formed on the second end face and the fourth end face, and the first through hole is perpendicular to the second end face.

[0011] Preferably, the adjusting steel block is rectangular and forms a second through hole, and the second through hole is perpendicular to a side surface of the adjusting steel block forming the second through hole.

[0012] Preferably, the first through hole of a non-adjustable steel block, the second through hole of an adjustable steel block and the screw hole of another non-adjustable steel block on the same side of the specimen correspond to and match each other, and the high-strength screw rod is sequentially inserted into the first through hole and the second through hole and screwed to the screw hole.

[0013] The present invention adopts the above technical solution, so it has the following beneficial effects:

[0014] The present invention can avoid local buckling of the steel pipe column end under axial pressure without affecting the overall performance of the specimen. By adjusting the relative positions and sizes of individual components of the device, it can be applied to short column components with different cross-sectional sizes, meeting the requirements of geometric compatibility and device reuse without the need for complex processing technology.

[0015] By adopting an adjusting steel block and a high-strength screw, the present invention becomes a rectangular steel pipe column end buckling restraint device with geometric compatibility. By changing the relative position of the steel block and replacing the size of the adjusting steel block, it can adapt to cross-sections of different sizes and meet the requirements of multiple groups of variable cross-section size tests.

[0016] The present invention uses high-strength screws to fix a series of adjusting steel blocks and non-adjusting steel blocks along the circumferential direction of the end of the specimen, thereby achieving an assembly effect. The method is simple and practical, does not require relatively complex installation processes such as welding that require high precision, and will not weaken the cross section of the specimen during the test.

[0017] The device of the present invention is easy to disassemble and can be reused. After completing a set of tests, the axial compression test of other sets of steel pipe short columns can be immediately carried out by selecting a suitable adjustment steel block. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a geometrically compatible assembled steel pipe column end buckling restraint system according to Embodiment 1 of the present invention;

[0019] Figure 2 A top view of a geometrically compatible assembled steel pipe column end buckling restraint system according to a first embodiment of the present invention;

[0020] Figure 3 It is a top view of the geometrically compatible assembled steel pipe column end buckling restraint system of the second embodiment of the present invention. DETAILED DESCRIPTION

[0021] According to the attached figure Figure 1 to Figure 3 , give the preferred embodiments of the present invention, and describe them in detail so that the functions and features of the present invention can be better understood.

[0022] See also Figure 1 and Figure 2 A geometrically compatible assembled steel pipe column end buckling restraint system according to a first embodiment of the present invention comprises two buckling restraint devices which are hooped at both ends of a specimen 4; the specimen 4 adopts a rectangular cross-section steel pipe; each of the two buckling restraint devices comprises four non-adjustable steel blocks 1, four adjustable steel blocks 3 and four high-strength screws 2, the four non-adjustable steel blocks 1 are arranged and fitted at the four corners of the specimen 4, the four adjustable steel blocks 3 are respectively arranged between two adjacent non-adjustable steel blocks 1 and fit the side of the specimen 4, and a non-adjustable steel block 1, an adjustable steel block 3 and another non-adjustable steel block 1 arranged in sequence on each side of the specimen 4 are connected by a high-strength screw 2.

[0023] The non-adjustable steel block 1 includes a notch 11, a first end face, a second end face, a third end face and a fourth end face; the notch 11 is formed adjacent to the first end face and the second end face and fits with the four corners of the specimen 4; the first end face is perpendicular to the second end face, the third end face is parallel to the first end face, and the fourth end face is parallel to the second end face; a screw hole 13 is formed on the first end face, and a first through hole 12 is formed on the second end face and the fourth end face, and the first through hole 12 is perpendicular to the second end face.

[0024] The adjusting steel block 3 is rectangular and forms a second through hole 31 . The second through hole 31 is perpendicular to a side surface of the adjusting steel block 3 where the second through hole 31 is formed.

[0025] The first through hole 12 of a non-adjustable steel block 1, the second through hole 31 of an adjustable steel block 3 and the screw hole 13 of another non-adjustable steel block 1 on the same side of the specimen 4 correspond to and cooperate with each other, and the high-strength screw rod 2 is sequentially inserted into the first through hole 12 and the second through hole 31 and screwed to the screw hole 13.

[0026] A geometrically compatible assembled steel pipe column end buckling restraint system according to embodiment 1 of the present invention can avoid local buckling and crushing at the column end of a rectangular steel pipe short column as specimen 4 without affecting the overall performance of specimen 4, thereby affecting the results of mechanical tests and the determination of relevant test data.

[0027] In the axial compression test of the steel tube short column specimen, the cross section of the column end will generate circumferential tension, and the specimen end is prone to local buckling and crushing under the action of the circumferential tensile stress. If the restraint device is installed at both ends of the specimen 4 before the axial compression test, the tensile strength between the rod end of the high-strength screw 2 and the screw hole 13 of the non-adjustable steel block 1, and the shear strength between the high-strength screw 2 and the steel block can provide effective restraint for the end of the rectangular steel tube short column specimen 4, and even under the action of axial pressure, the end of the specimen 4 will not be locally crushed due to buckling, ensuring that the overall performance and test results of the specimen 4 are not affected by the local crushing of the end.

[0028] See also Figure 3 When conducting multiple groups of axial compression tests with variable cross-sectional sizes, by replacing and adjusting the relative position and size of the steel block 3, it is possible to adapt to rectangular cross-sectional specimens 4 of different sizes, so the device has good geometric compatibility and error tolerance; in addition, the device adopts a full bolt assembly connection, which is quick and convenient and does not require professional welding operations. It can be disassembled and used repeatedly, and has certain economic benefits.

[0029] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A geometrically compatible prefabricated steel pipe column end buckling restraint system, It is characterized in that It comprises two buckling restraint devices which are hooped at both ends of a specimen; the specimen adopts a rectangular cross-section steel pipe; each of the two buckling restraint devices comprises four non-adjustable steel blocks, four adjustable steel blocks and four high-strength screws, the four non-adjustable steel blocks are arranged and attached to the four corners of the specimen, the four adjustable steel blocks are respectively arranged between two adjacent non-adjustable steel blocks and attached to the side of the specimen, and one non-adjustable steel block, one adjustable steel block and another non-adjustable steel block which are arranged in sequence on each side of the specimen are connected by one high-strength screw; The non-adjustable steel block includes a notch, a first end face, a second end face, a third end face and a fourth end face; the notch is formed adjacent to the first end face and the second end face and fits with the four corners of the specimen; the first end face is perpendicular to the second end face, the third end face is parallel to the first end face, and the fourth end face is parallel to the second end face; a screw hole is formed on the first end face, and a first through hole is formed on the second end face and the fourth end face, and the first through hole is perpendicular to the second end face.

2. The geometrically compatible assembled steel pipe column end buckling restraint system according to claim 1, It is characterized in that The adjusting steel block is rectangular and forms a second through hole, and the second through hole is perpendicular to a side surface of the adjusting steel block forming the second through hole.

3. The geometrically compatible assembled steel pipe column end buckling restraint system according to claim 2, It is characterized in that The first through hole of a non-adjustable steel block, the second through hole of an adjustable steel block and the screw hole of another non-adjustable steel block on the same side of the specimen correspond to and match each other, and the high-strength screw rod is sequentially inserted into the first through hole and the second through hole and screwed to the screw holes.

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