A buckling-restrained steel coupling beam

Abstract

The invention provides a buckling-restrained steel coupling beam. The steel coupling beam includes an H-shaped steel coupling beam and a plurality of buckling-restrained components. The H-shaped steel coupling beam includes an upper flange, a lower flange, and a web. A plurality of buckling-restrained components are symmetrically arranged on both sides of the web. The buckling-restrained components are arranged at intervals along the length direction of the H-shaped steel coupling beam. The buckling-restrained components are only connected to the flanges of the steel coupling beam, avoiding the problem that the welding joint between the stiffener and the web of the traditional steel coupling beam is prone to tearing. The buckling-restrained components limit the out-of-plane deformation of the web of the steel coupling beam, provide stable buckling suppression, and make the web approximately stressed in the plane, further improving the ductility and energy dissipation capacity of the steel coupling beam under seismic action.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and particularly relates to a buckling-restrained steel coupling beam. Background Art

[0002] As an efficient lateral force resisting system, the coupled shear wall system is widely used in high-rise building structures. The coupling beam is an important energy dissipation component in the coupled shear wall structure system under earthquake action, and is the first line of seismic fortification for the ductile shear wall structure. Its strength, stiffness, ductility and energy dissipation capacity have a great influence on the seismic performance of the structure system. When the span-depth ratio of the reinforced concrete coupling beam is less than 2.5, it is prone to shear failure and shows poor ductility and energy dissipation capacity. In order to overcome the shortcomings of the reinforced concrete coupling beam, researchers at home and abroad began to use steel coupling beams instead of reinforced concrete coupling beams and carried out a large number of theoretical and experimental studies. The results show that a reasonably designed steel coupling beam shows good ductility and energy dissipation capacity. The web of the steel coupling beam is prone to out-of-plane elastoplastic buckling after shear yielding, which to a certain extent reduces the ductility and energy dissipation capacity of the steel coupling beam. Setting stiffeners on the web of the steel coupling beam can effectively suppress the buckling problem of the web and improve the strength and energy dissipation capacity of the steel coupling beam. However, the welding joint between the stiffener and the web is prone to tearing, which will lead to a reduction in the ductility of the steel coupling beam.

[0003] In order to overcome the problem that the welding joint between the stiffener and the web of the steel coupling beam is prone to tearing, it is an urgent technical problem for those skilled in the art to propose a steel coupling beam that takes into account both ductility and energy dissipation capacity. Summary of the Invention

[0004] The purpose of the present invention is to provide a buckling-restrained steel coupling beam to solve the problems existing in the prior art.

[0005] The technical solution adopted to achieve the purpose of the present invention is as follows: a buckling-restrained steel coupling beam includes an H-shaped steel coupling beam and a plurality of buckling-restrained components.

[0006] The H-shaped steel coupling beam includes an upper flange, a lower flange and a web. A plurality of buckling-restrained components are symmetrically arranged on both sides of the web.

[0007] The buckling-restrained components are arranged at intervals along the length direction of the H-shaped steel coupling beam. Each buckling-restrained component includes a vertically arranged backing plate and a stiffener. The height of the backing plate is less than the height of the stiffener. One side plate surface of the backing plate is attached to the web, and at least one stiffener is fixed on the other side plate surface. The stiffener is perpendicular to the backing plate. The upper and lower ends of the stiffener are respectively fixedly connected to the upper flange and the lower flange.

[0008] Further, the H-shaped steel coupling beam is of high-frequency welded type or hot-rolled type.

[0009] Further, the H-shaped steel coupling beam is made of low yield point steel, ordinary strength steel or high strength steel.

[0010] Further, the upper and lower ends of the stiffener are respectively connected to the upper flange and the lower flange by fillet welds.

[0011] Further, a stiffener is fixed on one side surface of the gusset plate. The gusset plate and the stiffener form an angle steel or a T-shaped plate.

[0012] Further, two stiffeners are fixed on one side surface of the gusset plate. The gusset plate and the stiffeners form a channel steel.

[0013] The technical effects of the present invention are beyond doubt:

[0014] 1. The buckling restraining component is only connected to the flange of the steel coupling beam, avoiding the problem that the weld between the stiffener and the web of the traditional steel coupling beam is prone to tearing.

[0015] 2. The buckling restraining component restricts the out-of-plane deformation of the web of the steel coupling beam, provides stable buckling suppression, enables the web to be stressed approximately in the plane, and further improves the ductility and energy dissipation capacity of the steel coupling beam under seismic action. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a buckling restrained steel coupling beam;

[0017] Figure 2 is an elevation view of a buckling restrained steel coupling beam;

[0018] Figure 3 is a sectional view taken along line A-A;

[0019] Figure 4 is a sectional view taken along line B-B.

[0020] In the figure: H-shaped steel coupling beam 1, upper flange 101, lower flange 102, web 103, buckling restraining component 2, gusset plate 201, stiffener 202. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter scope of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical idea of the present invention, various substitutions and changes made according to ordinary technical knowledge and customary means in the art shall be included within the protection scope of the present invention.

[0022] Embodiment 1:

[0023] See Figures 1 to 4 , this embodiment discloses a buckling restrained steel coupling beam, including an H-shaped steel coupling beam 1 and a buckling restraining component 2.

[0024] The H-shaped steel coupling beam 1 is of the shear yielding energy dissipation type. The H-shaped steel coupling beam 1 is connected to the shear wall by end plates. The H-shaped steel coupling beam 1 includes an upper flange 101, a lower flange 102, and a web 103. Buckling restraining components 2 are symmetrically arranged on both sides of the web 103.

[0025] The buckling restraining components 2 are arranged at intervals along the length direction of the H-shaped steel coupling beam 1. Each buckling restraining component 2 includes a vertically arranged backing plate 201 and a stiffener 202. One side plate surface of the backing plate 201 is attached to the web 103, and a stiffener 202 is fixed on the other side plate surface. The stiffener 202 is perpendicular to the backing plate 201, and the backing plate 201 and the stiffener 202 form a T-shaped plate. The upper and lower ends of the stiffener 202 are respectively connected to the upper flange 101 and the lower flange 102 by fillet welds. The difference between the height of the backing plate and the height of the web is greater than twice the fillet weld size of the flange and the web. The width of the backing plate is selected to be 3 - 5 times the thickness of the backing plate. The thickness of the backing plate is not less than the thickness of the flange. The height of the stiffener is the same as the height of the web. The thickness of the stiffener is not less than the thickness of the flange.

[0026] It should be noted that the surface-to-surface contact is adopted between the backing plate 201 and the web 102 to construct a deformation mechanism in which the two surfaces of the backing plate 201 and the web 102 are mutually displaced in-plane and constrained out-of-plane, ensuring that the steel coupling beam does not buckle and improving the energy dissipation capacity.

[0027] Example 2:

[0028] This example provides a basic buckling restraining steel coupling beam, including an H-shaped steel coupling beam 1 and buckling restraining components 2.

[0029] The H-shaped steel coupling beam 1 includes an upper flange 101, a lower flange 102, and a web 103. Buckling restraining components 2 are symmetrically arranged on both sides of the web 103.

[0030] The buckling restraining components 2 are arranged at intervals along the length direction of the H-shaped steel coupling beam 1. Each buckling restraining component 2 includes a vertically arranged backing plate 201 and a stiffener 202. The height of the backing plate 201 is less than the height of the stiffener 202. One side plate surface of the backing plate 201 is attached to the web 103, and at least one stiffener 202 is fixed on the other side plate surface. The stiffener 202 is perpendicular to the backing plate 201. The upper and lower ends of the stiffener 202 are respectively fixedly connected to the upper flange 101 and the lower flange 102.

[0031] Example 3:

[0032] The main structure of this example is the same as that of Example 2, wherein the H-shaped steel coupling beam 1 is of the high-frequency welded type or the hot-rolled type.

[0033] Example 4:

[0034] The main structure of this embodiment is the same as that of Embodiment 2. Among them, the H-shaped steel coupling beam 1 is made of low yield point steel, ordinary strength steel or high strength steel.

[0035] Embodiment 5:

[0036] The main structure of this embodiment is the same as that of Embodiment 2. Among them, the upper and lower ends of the stiffener 202 are respectively connected to the upper flange 101 and the lower flange 102 by fillet welds.

[0037] Embodiment 6:

[0038] The main structure of this embodiment is the same as that of Embodiment 2. Among them, a stiffener 202 is fixed on one side surface of the backing plate 201. The backing plate 201 and the stiffener 202 form an angle steel or a T-shaped plate.

[0039] Embodiment 7:

[0040] The main structure of this embodiment is the same as that of Embodiment 2. Among them, two stiffeners 202 are fixed on one side surface of the backing plate 201. The backing plate 201 and the stiffeners 202 form a channel steel.

Claims

1. A buckling-restrained steel coupling beam, characterized in that: It includes an H-shaped steel coupling beam (1) connected to a shear wall, and several buckling-restrained components (2); The H-shaped steel coupling beam (1) is connected to the shear wall by end plates; the H-shaped steel coupling beam (1) includes an upper flange (101), a lower flange (102) and a web (103); several buckling-restrained components (2) are symmetrically arranged on both sides of the web (103); The buckling-restrained components (2) are arranged at intervals along the length direction of the H-shaped steel coupling beam (1); each buckling-restrained component (2) includes a vertically arranged backing plate (201) and stiffeners (202); the height of the backing plate (201) is less than the height of the stiffeners (202); one side plate surface of the backing plate (201) is attached to the web (103), and at least one stiffener (202) is fixed on the other side plate surface; the stiffeners (202) are perpendicular to the backing plate (201); the upper and lower ends of the stiffeners (202) are respectively connected to the upper flange (101) and the lower flange (102) by fillet welds.

2. The buckling-restrained steel coupling beam according to claim 1, characterized in that: The H-shaped steel coupling beam (1) is of high-frequency welded type or hot-rolled type.

3. The buckling-restrained steel coupling beam according to claim 1, wherein: The H-shaped steel coupling beam (1) is made of low-yield-point steel, ordinary-strength steel or high-strength steel.

4. A buckling-restrained steel coupling beam according to claim 1, characterized in that: One stiffener (202) is fixed on one side plate surface of the backing plate (201); the backing plate (201) and the stiffeners (202) form an angle steel or a T-shaped plate.

5. A buckling-restrained steel coupling beam according to claim 1, characterized in that: Two stiffeners (202) are fixed on one side plate surface of the backing plate (201); the backing plate (201) and the stiffeners (202) form a channel steel.

Images