CN114894618A - Geometrically compatible assembly type steel pipe column end buckling constraint system - Google Patents

Abstract

The invention provides a geometrically compatible assembly type steel pipe column end buckling constraint system which consists of two buckling constraint devices sleeved on two ends of a test piece; the test piece adopts a steel pipe with a rectangular cross section; each two bucking restraint device includes four non-regulation steel blocks, four regulation steel blocks and four high-strength screw rods, four the non-regulation steel block set up and laminate in the four corners of test piece, four the regulation steel block set up respectively in adjacent two between the non-regulation steel block and laminate the side of test piece, one that each side of test piece set gradually non-regulation steel block, one adjust steel block and another the non-regulation steel block passes through one the high-strength screw rod links to each other. The invention relates to a geometrically compatible assembly type steel pipe column end buckling restraint system which can be suitable for repeated use of rectangular section test pieces with different sizes for multiple times so as to avoid local crushing of the end part of a short column of a rectangular section steel pipe in a compression test.

Description

Geometrically compatible buckling restraint system of fabricated steel tube column ends

technical field

The invention relates to the field of compression test auxiliary devices for short steel pipe columns with rectangular sections, in particular to a geometrically compatible assembled steel pipe column end buckling restraint system.

Background technique

In the compression test of the short steel pipe column with rectangular section, the steel pipe is prone to local buckling at the end under the action of the pressure at both ends and the collapse phenomenon occurs, so the true mechanical properties of the steel pipe short column cannot be obtained from the test.

The steel tube stub is the main component under pressure, so it is necessary to carry out the compression test to obtain its mechanical properties under the state of axial compression for its application in the field of engineering or research. However, since the steel pipe is generally a thin-walled member, in the axial compression test, the thin-walled steel pipe short column is prone to local buckling at the end under the action of the axial pressure, which is manifested as local collapse at both ends of the steel pipe short column due to bulging. , thereby affecting the results of mechanical tests and the determination of related data.

Therefore, in order to obtain the real mechanical properties of the rectangular steel tube short column in the axial compression test, it is necessary to take appropriate protective measures for the steel tube short column member to prevent the local collapse phenomenon under the action of axial pressure. Currently, the existing implementation solutions are:

In the welding bottom plate method, the two ends of the short column of the steel pipe are welded to the steel plate, and the welded steel plate can restrain the end section of the short column.

The ferrule restraint method is mainly aimed at the round steel pipe short column, using steel ferrules and bolts to restrain the end section of the steel pipe short column.

Aiming at the problem that the end of the short column member of the rectangular steel tube is prone to local buckling under the axial compression test, an effective restraint device should be installed at the end of the steel tube column. A reasonable restraint device should have good applicability and economy to meet the requirements of a large number of groups of repeated mechanical tests. However, the existing technology has the following defects: poor geometric compatibility, the restraint device can only be aimed at a specific section, and cannot adapt to the change of section size in different tests; high processing accuracy is required, and error tolerance is low, such as welding The bottom plate method is relatively difficult to process the bottom plate of the short steel pipe column, and the precision is high, and it will weaken the steel pipe section and affect the bearing capacity of the steel pipe in the test; the restraint device is difficult to reuse, and the restraint device is used after a set of tests. It is usually necessary to replace the new device, which cannot be reused, and the economic benefit is not high.

SUMMARY OF THE INVENTION

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 collapse at the end of the rectangular-section steel pipe short column during the compression test.

In order to achieve the above object, the present invention provides a geometrically compatible assembled steel pipe column end buckling restraint system, comprising two buckling restraint devices hooped at both ends of a test piece; the test piece adopts a rectangular section steel pipe; The two buckling restraint devices include four non-adjusting steel blocks, four adjusting steel blocks and four high-strength screws. Four non-adjusting steel blocks are arranged and attached to the four corners of the test piece, and four adjusting steel blocks are respectively arranged adjacent to each other. The two non-adjustable steel blocks are attached to the side of the test piece, and each side of the test piece is sequentially arranged with one of the non-adjustable steel blocks, one of the adjusted steel blocks and the other of the non-adjustable steel blocks. The steel blocks are connected by a said high-strength screw.

Preferably, the non-adjusting 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 in the first end face and the second end face. adjacent to the four corners of the test piece; 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 The end faces are parallel; the first end face forms a screw hole, the second end face and the fourth end face form a first through hole, and the first through hole is perpendicular to the second end face.

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

Preferably, on the same side of the test piece, the first through hole of the non-adjustment steel block, the second through hole of the adjustment steel block, and the non-adjustment steel block of the other The positions of the screw holes correspond and match, and the high-strength screw rods are sequentially inserted into the first through hole and the second through hole and screwed with the screw holes.

The present invention has the following beneficial effects due to the adoption of the above technical solutions:

The invention can avoid local buckling of the steel pipe column end under the action of axial pressure without affecting the overall performance of the test piece, and can be applied to short column members with different cross-sectional sizes by adjusting the relative positions and sizes of individual components of the device. Meet the requirements of geometric compatibility and device reuse without complex machining processes.

By using adjusting steel blocks and high-strength screws, the present invention becomes a geometrically compatible rectangular steel pipe column end buckling restraint device, which can be adapted to sections of different sizes by changing the relative position of the steel blocks and changing the size of the adjusting steel blocks. , to meet the requirements of multiple sets of variable section size tests.

The invention uses a high-strength screw to fix a series of adjusting steel blocks and non-adjusting steel blocks along the circumference of the end of the test piece, so as to achieve the effect of assembly type, which is simple and practical, and does not require relatively complicated installation processes such as welding and high precision requirements, and There will be no weakening of the specimen section during the test.

The device of the invention is easy to disassemble and can be used repeatedly. After one set of tests is completed, other sets of steel pipe short-column axial compression tests can be immediately performed by selecting an appropriate adjusting steel block.

Description of drawings

1 is a schematic structural diagram of a geometrically compatible prefabricated steel tube column end buckling restraint system according to Embodiment 1 of the present invention;

FIG. 2 is a top view of the geometrically compatible prefabricated steel tube column end buckling restraint system according to the first embodiment of the present invention;

FIG. 3 is a top view of the geometrically compatible prefabricated steel tube column end buckling restraint system according to the second embodiment of the present invention.

Detailed ways

1 to 3 of the accompanying drawings, preferred embodiments of the present invention are given and described in detail, so that the functions and features of the present invention can be better understood.

Please refer to FIG. 1 and FIG. 2 , a geometrically compatible assembled steel tube column end buckling restraint system according to the first embodiment of the present invention includes two buckling restraint devices hooped at both ends of a test piece 4; the test piece 4 adopts a rectangular section Steel pipe; each two buckling restraint devices include four non-adjusting steel blocks 1, four adjusting steel blocks 3 and four high-strength screws 2, four non-adjusting steel blocks 1 are arranged and fit on the four corners of the test piece 4, and four adjusting steel blocks 3 are respectively It is arranged between two adjacent non-adjustable steel blocks 1 and is attached to the side of the test piece 4. A non-adjustable steel block 1, an adjustment steel block 3 and another non-adjustment steel block 1 are sequentially arranged on each side of the test piece 4. Connected by a high-strength screw 2 .

The non-adjusting 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 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; the first end face forms a screw hole 13, and the second end face and the fourth end face form a The first through hole 12 is perpendicular to the second end face.

The adjusting steel block 3 is rectangular and forms a second through hole 31 , and the second through hole 31 is perpendicular to one side surface of the adjusting steel block 3 forming the second through hole 31 .

On the same side of the specimen 4, the first through hole 12 of a non-adjusting steel block 1, the second through hole 31 of an adjusting steel block 3 and the screw hole 13 of the other non-adjusting steel block 1 correspond to and cooperate with each other, and the high-strength screw 2 The first through hole 12 and the second through hole 31 are sequentially inserted into the first through hole 12 and screwed with the screw hole 13 .

A geometrically compatible prefabricated steel tube column end buckling restraint system according to the first embodiment of the present invention can avoid local buckling at the end of the rectangular steel tube short column as the test piece 4 without affecting the overall performance of the test piece 4. The crushing phenomenon occurs, which affects the results of mechanical tests and the determination of related test data.

In the axial compression test of the steel tube short column specimen, the section at the end of the column will generate a hoop tensile force, and the end of the specimen is prone to local buckling and collapse under the action of the hoop 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-adjusting steel block 1, the tension between the high-strength screw 2 and the steel block The shear strength can provide effective restraint on the end of the rectangular steel tube short column specimen 4. Even under the action of the axial pressure, the end of the specimen 4 will not be locally crushed due to buckling, which ensures the Overall performance and test results are not affected by localized crushing of the ends.

Please refer to Figure 3. When multiple sets of axial compression tests with variable cross-sectional dimensions are carried out, the relative position and size of the steel blocks 3 can be adjusted to adapt to different sizes of rectangular cross-section test pieces 4, so the device has a good geometry. Compatibility and tolerance of errors; in addition, the device adopts a fully bolted assembly connection, which is fast and convenient, and does not require professional welding operations. It can be disassembled and used many times, which has certain economic benefits.

The present invention has been described in detail above with reference to the embodiments of the accompanying drawings, and those skilled in the art can make various modifications to the present invention according to the above description. Therefore, some details in the embodiments should not be construed to limit the present invention, and the present invention will take the scope defined by the appended claims as the protection scope of the present invention.

Claims (4)

1. A geometrically compatible assembly type steel pipe column end buckling constraint system is characterized by comprising two buckling constraint devices hooped at two ends of a test piece; the test piece adopts a steel pipe with a rectangular cross section; each two bucking restraint device includes four non-regulation steel blocks, four regulation steel blocks and four high-strength screw rods, four the non-regulation steel block set up and laminate in the four corners of test piece, four the regulation steel block set up respectively in adjacent two between the non-regulation steel block and laminate the side of test piece, one that each side of test piece set gradually non-regulation steel block, one adjust steel block and another the non-regulation steel block passes through one the high-strength screw rod links to each other.

2. The geometrically compatible assembly steel tubular column end buckling constraint system of claim 1, wherein said non-adjusting steel block comprises a notch, a first end face, a second end face, a third end face and a fourth end face; the notch is formed at the adjacent position of the first end surface and the second end surface and is attached to four corners of the test piece; 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; the first end surface is provided with a screw hole, the second end surface and the fourth end surface are provided with a first through hole, and the first through hole is vertical to the second end surface.

3. The geometrically compatible assembly steel tubular column end buckling constraint system of claim 2, wherein said adjustment steel block is rectangular and forms a second through hole perpendicular to a side of said adjustment steel block forming said second through hole.

4. The geometrically compatible assembly type steel pipe column end buckling constraint system according to claim 3, characterized in that the first through hole of one of the non-adjusting steel blocks, the second through hole of one of the adjusting steel blocks and the screw hole of the other non-adjusting steel block on the same side of the test piece correspond in position and cooperate, and the high-strength screw rod is sequentially inserted into the first through hole and the second through hole and screwed with the screw hole.

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