Prefabricated Self-Balancing Steel Beam Buckling Restraint Device

Abstract

The present invention provides a prefabricated self-balanced steel beam buckling restraint device, which includes an aluminum tube, an aluminum plate, two L-shaped plates, two first adjusting plates, two second adjusting plates, two third adjusting plates and a base; the aluminum plate is screwed to the base; the aluminum tube is vertically fixed in the middle of the aluminum plate; two test pieces are arranged on both sides of the aluminum tube in the horizontal direction, and each test piece includes a web, an upper flange and a lower flange; the two L-shaped plates are screwed to both sides of the aluminum tube; the web of each test piece is screwed to the aluminum tube through a second adjusting plate and a number of bolts; the upper flange of each test piece is screwed to the L-shaped plate through a first adjusting plate and a number of bolts; the lower flange of each test piece is screwed to the aluminum plate through a third adjusting plate and a number of bolts. The present invention is a prefabricated self-balanced steel beam buckling restraint device, which can be reused for steel beam test pieces with different cross-sectional forms and sizes, effectively restrains local buckling at the concentrated load acting position of the steel beam, and at the same time avoids torsion caused by load eccentricity.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary devices for flexural tests of thin-walled steel beams, and particularly to an assembled self-balanced steel beam buckling restraint device. Background Art

[0002] In the flexural test of thin-walled steel beams, there are large local compressive stresses at the concentrated load application points, making the steel beam specimens extremely prone to local buckling and resulting in crushing phenomena, thus preventing the true mechanical properties of the steel beams from being obtained from the flexural tests. Additionally, the cross-sections of asymmetric steel beam specimens are extremely prone to torsion under the action of concentrated loads, leading to overall instability.

[0003] Steel beams are the main components that bear bending moments. Therefore, it is very necessary to conduct flexural tests on them to obtain their mechanical properties under the action of bending moments for scientific research and engineering applications. However, since steel beams are generally thin-walled components, in flexural tests with concentrated loads, thin-walled steel beams are prone to local buckling at the concentrated load points under the action of large local compressive stresses, manifested as local crushing of the steel beams, thus affecting the results of mechanical tests and the determination of relevant data.

[0004] Currently, to prevent local crushing at the concentrated load application points in the flexural test of steel beams, the existing implementation schemes are as follows:

[0005] Reinforcement method with fillers. Fill objects suitable for the beam cross-section size, such as wooden blocks or steel blocks, at the concentrated load application points of the flexural steel beam to provide stiffness to resist the concentrated load, thereby playing a restraining role on the steel beam.

[0006] However, for the problem that specimens in the flexural test of thin-walled steel beams are prone to local buckling at the concentrated load application points, an effective restraint device should be set at the concentrated load application points of the steel beam. A reasonable restraint device should have good applicability, installability, and economy, so as to meet the requirements of a large number of repeated mechanical tests. To sum up, the existing technologies have the following defects: poor restraint effect, for example, the wooden blocks in the method of filling wooden blocks have small stiffness due to material reasons and are difficult to provide sufficient stiffness and effective restraint for the steel beam; poor geometric compatibility, the restraint device can only be targeted at a specific cross-section and cannot adapt to changes in cross-section forms and sizes in different tests, such as the method of filling steel blocks; the restraint device is difficult to reuse, and the restraint device usually needs to be replaced with a new one after a group of tests and cannot be reused, resulting in low economic benefits. Summary of the Invention

[0007] Aiming at the deficiencies in the above-mentioned existing technologies, the present invention provides an assembled self-balanced steel beam buckling restraint device, which can effectively restrain the steel beam at the concentrated load application points without affecting the overall performance of the steel beam specimens, and at the same time avoid torsion caused by load eccentricity.

[0008] To achieve the above object, the present invention provides an assembled self - balancing steel beam buckling restraint device, which includes an aluminum tube, an aluminum plate, two L - shaped plates, two first adjusting plates, two second adjusting plates, two third adjusting plates and a base; the aluminum plate is screwed to the base; the aluminum tube is vertically fixed in the middle of the aluminum plate; two specimens are arranged on both sides of the aluminum tube in the horizontal direction. The specimens are thin - walled steel beams with a C - shaped cross - section, and each specimen includes a web, an upper flange connected to the upper end of the web, and a lower flange connected to the lower end of the web; the two L - shaped plates are screwed to both sides of the aluminum tube; the web of each specimen is screwed to the aluminum tube through a second adjusting plate and a number of bolts; the upper flange of each specimen is screwed to the L - shaped plate through a first adjusting plate and a number of bolts; the lower flange of each specimen is screwed to the aluminum plate through a third adjusting plate and a number of bolts.

[0009] Preferably, the cross - section of the aluminum tube is rectangular, and two first long grooves are respectively formed along the longitudinal direction on both sides of the aluminum tube, and two first screw holes are formed at the bottom of both sides of the aluminum tube.

[0010] Preferably, two connection through - holes are formed in the middle of the aluminum plate along the length direction of the specimen. Two second screw holes are respectively formed along the length direction of the specimen on both sides of the connection through - hole, and two third screw holes are respectively formed in the direction perpendicular to the length of the specimen outside the second screw holes; the aluminum plate is screwed to the base through the connection through - hole; the aluminum tube is connected to the aluminum plate through the first screw hole, the connection piece and the second screw hole.

[0011] Preferably, the L - shaped plate includes a bottom plate and a side plate. A fourth screw hole is formed in the side plate, and a second long groove is formed in the bottom plate along the direction perpendicular to the length of the specimen; the two L - shaped plates are respectively connected to both sides of the aluminum tube through the fourth screw hole and the first long groove.

[0012] Preferably, a number of fifth screw holes are formed in the first adjusting plate, and the first adjusting plate, the upper flange and the L - shaped plate are fixed by bolts sequentially passing through the fifth screw hole, the upper flange and the second long groove.

[0013] Preferably, a number of sixth screw holes are formed in the second adjusting plate, and the second adjusting plate, the web and the aluminum tube are fixed by bolts sequentially passing through the sixth screw hole, the web and the first long groove.

[0014] Preferably, a number of third long grooves are formed in the third adjusting plate along the direction perpendicular to the length of the specimen, and the third adjusting plate, the lower flange and the aluminum plate are fixed by bolts sequentially passing through the third long groove, the lower flange and the third screw hole.

[0015] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0016] The present invention fixes the test piece through components such as an aluminum tube, an aluminum plate, an L-shaped plate, an adjusting plate, and bolts, which can provide sufficient local stiffness for the test piece and prevent local crushing of the test piece.

[0017] By replacing the appropriate adjusting plate, it can adapt to cross-sections of different forms and sizes, meet the constraint requirements of multiple groups of flexural tests of variable cross-section steel beams, and has good geometric compatibility and error tolerance.

[0018] The device adopts all-bolt assembly connection, which is fast and convenient, can be disassembled and reused multiple times, and has certain economic benefits.

[0019] The device divides through the middle aluminum tube so that the flexural test of the steel beam can be carried out symmetrically on both sides at the same time, effectively avoiding the torsional effect caused by the concentrated load and the mutual contact of the test pieces due to buckling deformation, and achieving the purpose of self-balanced flexural test of the steel beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the assembled self-balanced steel beam buckling restraint device according to the embodiment of the present invention;

[0021] Figure 2 It is a front view of the aluminum tube according to the embodiment of the present invention;

[0022] Figure 3 It is a side view of the aluminum tube according to the embodiment of the present invention;

[0023] Figure 4 It is a top view of the aluminum tube according to the embodiment of the present invention;

[0024] Figure 5 It is a top view of the aluminum plate according to the embodiment of the present invention;

[0025] Figure 6 It is a front view of the aluminum plate according to the embodiment of the present invention;

[0026] Figure 7 It is a top view of the L-shaped plate according to the embodiment of the present invention;

[0027] Figure 8 It is a front view of the L-shaped plate according to the embodiment of the present invention;

[0028] Figures 9 to 10 It is a top view of the first adjusting plate of different sizes according to the embodiment of the present invention;

[0029] Figures 11 to 13 It is a top view of the second adjusting plate of different sizes according to the embodiment of the present invention;

[0030] Figures 14 to 15This is a top view of the third adjusting plates of different sizes according to the embodiments of the present invention. Detailed Embodiments

[0031] The following is based on the attached drawings Figures 1 to 15 to give the preferred embodiments of the present invention and describe them in detail, so as to better understand the functions and features of the present invention.

[0032] Please refer to Figures 1 to 15 , an assembled self-balanced steel beam buckling restraint device according to an embodiment of the present invention, comprising an aluminum tube 1, an aluminum plate 2, two L-shaped plates 3, two first adjusting plates 4, two second adjusting plates 5, two third adjusting plates 6 and a base 8; the aluminum plate 2 is screwed to the base 8; the aluminum tube 1 is vertically fixed in the middle of the aluminum plate 2; two specimens 7 are arranged on both sides of the aluminum tube 1 in the horizontal direction. In this embodiment, the specimen 7 is a thin-walled steel beam with a C-shaped cross-section, and the specimen 7 includes a web, an upper flange connected to the upper end of the web, and a lower flange connected to the lower end of the web; in other embodiments, specimens 7 with other structures can also be used according to needs; two L-shaped plates 3 are screwed to both sides of the aluminum tube 1; the web of each specimen 7 is screwed to the aluminum tube 1 through a second adjusting plate 5 and a plurality of bolts; the upper flange of each specimen 7 is screwed to the L-shaped plate 3 through a first adjusting plate 4 and a plurality of bolts; the lower flange of each specimen 7 is screwed to the aluminum plate 2 through a third adjusting plate 6 and a plurality of bolts.

[0033] The cross-section of the aluminum tube 1 is rectangular, and a first long groove 11 is respectively formed along the longitudinal direction on both sides of the aluminum tube 1, and two first screw holes 12 are formed at the bottom of both sides of the aluminum tube 1.

[0034] Two connection through holes 21 are formed in the middle of the aluminum plate 2 along the length direction of the specimen 7, two second screw holes 22 are respectively formed along the length direction of the specimen 7 on both sides of the connection through holes 21, and two third screw holes 23 are respectively formed in the direction perpendicular to the length of the specimen 7 outside the second screw holes 22; the aluminum plate 2 is screwed to the base 8 through the connection through holes 21; the aluminum tube 1 is connected to the aluminum plate 2 through the first screw holes 12, connection pieces and the second screw holes 22.

[0035] The L-shaped plate 3 includes a bottom plate and a side plate, the side plate forms a fourth screw hole 31, and the bottom plate forms a second long groove 32 in the direction perpendicular to the length of the specimen 7; the two L-shaped plates 3 are respectively connected to both sides of the aluminum tube 1 through the fourth screw hole 31 and the first long groove 11.

[0036] The first adjusting plate 4 is provided with a plurality of fifth screw holes 41, and the first adjusting plate 4, the upper flange and the L-shaped plate 3 are fixed by bolts sequentially passing through the fifth screw holes 41, the upper flange and the second long groove 32.

[0037] The second adjusting plate 5 is provided with a plurality of sixth screw holes 51, and the second adjusting plate 5, the web and the aluminum tube 1 are fixed by bolts sequentially passing through the sixth screw holes 51, the web and the first long groove 11.

[0038] The third adjusting plate 6 is provided with a plurality of third long slots 61 along the direction perpendicular to the length of the test piece 7. The third adjusting plate, the lower flange and the aluminum plate 2 are fixed by bolts sequentially passing through the third long slots 61, the lower flange and the third screw holes 23.

[0039] In the flexural test of the steel beam, a concentrated load is generally applied at a specific position of the test piece 7 to generate a bending moment in the beam, so that the mechanical properties of the steel beam under the action of the bending moment can be measured. However, there is a large local compressive stress at the position where the concentrated load acts. The thin-walled steel beam as the test piece 7 is very likely to undergo local buckling and crushing at these places. Therefore, it is necessary to restrain the steel beam test piece 7 at the position where the concentrated load acts. The present invention is an assembled self-balanced steel beam buckling restraint device, which can prevent local crushing at the position where the concentrated load acts without affecting the overall performance of the flexural test piece 7, and effectively avoid the torsion of the test piece 7.

[0040] Installing this restraint device at the position where the concentrated load acts in the flexural test of the steel beam can effectively increase the local stiffness of the test piece 7. At the position where the concentrated load acts, the steel beam test piece 7 will not buckle due to excessive local compressive stress and cause local crushing.

[0041] When performing multiple groups of flexural tests on variable cross-section steel beams, by changing the forms and sizes of the first adjusting plate 4, the second adjusting plate 5 and the third adjusting plate 6, it is possible to adapt to steel beam flexural test pieces 7 with different cross-sections. Therefore, this device has good geometric compatibility; in addition, this device adopts a fully bolted assembled connection, which is fast, convenient and can be disassembled and reused multiple times, having certain economic benefits.

[0042] In addition, the flexural test of the steel beam can be carried out symmetrically on both sides of the action of this device, and the concentrated load action line passes through the centers of the steel beams on both sides, which can effectively avoid the torsional action caused by the load deviating from the shear center. At the same time, the test pieces 7 on both sides are separated by the aluminum tube 1 in the middle of the device, which can avoid the mutual contact of the two test pieces 7 due to buckling deformation during the test.

[0043] The present invention has been described in detail above in conjunction with the embodiments with the attached drawings. Those of ordinary skill in the art can make various variations of the present invention according to the above description. Therefore, some details in the embodiments should not constitute a limitation to 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

1. An assembled self - balanced buckling restraint device for steel beams, characterized in that, It includes an aluminum tube, an aluminum plate, two L-shaped plates, two first adjusting plates, two second adjusting plates, two third adjusting plates and a base; the aluminum plate is screwed to the base; the aluminum tube is vertically fixed in the middle of the aluminum plate; two specimens are arranged on both sides of the aluminum tube in the horizontal direction, the specimens are thin-walled steel beams with a C-shaped cross section, and each specimen includes a web, an upper flange connected to the upper end of the web and a lower flange connected to the lower end of the web; the two L-shaped plates are screwed to both sides of the aluminum tube; the web of each specimen is screwed to the aluminum tube through a second adjusting plate and a number of bolts; the upper flange of each specimen is screwed to the L-shaped plate through a first adjusting plate and a number of bolts; the lower flange of each specimen is screwed to the aluminum plate through a third adjusting plate and a number of bolts; the cross section of the aluminum tube is rectangular, two first long grooves are respectively formed along the longitudinal direction on both sides of the aluminum tube, and two first screw holes are formed at the bottoms of both sides of the aluminum tube; two connecting through holes are formed in the middle of the aluminum plate along the length direction of the specimen, two second screw holes are respectively formed along the length direction of the specimen on both sides of the connecting through hole, and two third screw holes are respectively formed in the direction perpendicular to the length of the specimen outside the second screw hole; the aluminum plate is screwed to the base through the connecting through hole; the aluminum tube is connected to the aluminum plate through the first screw hole, the connecting piece and the second screw hole.

2. The prefabricated self-balanced steel beam buckling restraint device according to claim 1, characterized in that, The L-shaped plate includes a bottom plate and a side plate, the side plate forms a fourth screw hole, and the bottom plate forms a second long groove along the direction perpendicular to the length of the specimen; the two L-shaped plates are respectively connected to both sides of the aluminum tube through the fourth screw hole and the first long groove.

3. The prefabricated self-balanced steel beam buckling restraint device according to claim 2, characterized in that, The first adjusting plate is provided with a number of fifth screw holes, and the first adjusting plate, the upper flange and the L-shaped plate are fixed by bolts sequentially passing through the fifth screw hole, the upper flange and the second long groove.

4. The prefabricated self-balanced steel beam buckling restraint device according to claim 3, characterized in that, The second adjusting plate is provided with a number of sixth screw holes, and the second adjusting plate, the web and the aluminum tube are fixed by bolts sequentially passing through the sixth screw hole, the web and the first long groove.

5. The prefabricated self-balanced steel beam buckling restraint device according to claim 4, wherein The third adjusting plate is provided with a number of third long grooves along the direction perpendicular to the length of the specimen, and the third adjusting plate, the lower flange and the aluminum plate are fixed by bolts sequentially passing through the third long groove, the lower flange and the third screw hole.

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