A distortion buckling structure of a lower flange of a narrow flange H-shaped steel beam

Abstract

The utility model discloses a kind of narrow flange H-shaped steel beam lower flange distortion buckling structures. The structure is composed of H-shaped steel beam, reinforced concrete floor, T-shaped transverse stiffening rib, H-shaped embedding fixture and stud. By symmetrically setting T-shaped transverse stiffening rib on both sides of H-shaped steel beam web, it forms H-shaped combined cross-section transverse stiffening rib, improves the bending stiffness and strength of transverse stiffening rib, and at the same time, extends H-shaped transverse stiffening rib upward and embeds it in reinforced concrete floor, improves the restraint capacity outside H-shaped steel beam surface, thereby effectively solves the problem of narrow flange H-shaped steel beam lower flange distortion buckling. It improves the stability of steel beam lower flange, saves cost, has good economic benefit and beneficial effect.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, and specifically relates to a structure for constraining the lower flange distortion buckling of a narrow-flange H-beam. Background Technology

[0002] Steel structures are widely used in industrial and civil buildings due to their high strength and lightweight characteristics. Among them, the distortion buckling of the lower flange at the beam end of the steel frame beam under negative bending moment is a problem of great concern in steel structure design. It is generally solved by setting corner braces or transverse stiffeners.

[0003] Currently, the country is vigorously promoting the application of industrialized prefabricated steel structure housing. In residential steel structures, to ensure that the steel frame beams are not exposed outside the walls, narrow-flange H-beams with a width of no more than 150mm are often used. To meet building requirements, according to Article 6.2.7 of the "Steel Structure Design Standard" GB50017-2017, only transverse stiffeners can be used to control the distortion buckling of the lower flange at the beam ends. However, due to the large height and narrow flanges of the steel frame beams, the out-of-plane stiffness of the steel beams themselves is relatively weak. The cross-shaped section formed by the narrow transverse stiffeners and the web is insufficient to restrain the out-of-plane distortion buckling of the lower flange. Under seismic loading, distortion buckling will occur when plastic hinges form at the beam ends, thus affecting the plastic deformation capacity of the overall structure and significantly reducing the seismic performance of steel structure buildings. Developing a structure that can effectively restrain the distortion buckling of the lower flange of narrow-flange H-beams without affecting the building's functionality is a problem that structural engineers urgently need to solve in order to vigorously promote the development of industrialized prefabricated steel structure housing.

[0004] This invention aims to develop a structure for constraining the lower flange distortion buckling of narrow-flange H-beams, in order to solve the problem of lower flange distortion buckling of narrow-flange H-beams. At the same time, it does not affect the usable space of the building, and the structure is simple and easy to construct, so as to vigorously promote the application of industrialized prefabricated steel structure systems in good houses. Utility Model Content

[0005] To address the aforementioned problems, this utility model aims to provide a structure for constraining the lower flange distortion buckling of narrow-flange H-beams. By symmetrically arranging T-shaped transverse stiffeners on both sides of the web, transverse stiffeners with an H-shaped composite section are formed, improving the bending stiffness and strength of the transverse stiffeners. At the same time, the H-shaped transverse stiffeners are extended upward and embedded in the reinforced concrete floor slab, enhancing the out-of-plane constraint capacity of the H-beam, thereby effectively solving the problem of lower flange distortion buckling of narrow-flange H-beams.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A structure for constraining the lower flange distortion buckling of a narrow-flange H-beam is disclosed. The structure comprises an H-beam, a reinforced concrete slab, T-shaped transverse stiffeners, H-shaped inserts, and studs. The T-shaped transverse stiffeners are symmetrically welded to both sides of the web of the H-beam. The H-shaped inserts are welded to the upper flange of the H-beam and embedded in the reinforced concrete slab. The studs are welded to the flanges of the H-shaped inserts and horizontally embedded in the reinforced concrete slab, thus forming a structure for constraining the lower flange distortion buckling of the narrow-flange H-beam.

[0008] The T-shaped transverse stiffener is a hot-rolled T-shaped steel or a welded T-shaped steel. The flange width of the T-shaped transverse stiffener is 100mm to 200mm, the section height is the same as the width of the lower flange extension of the H-shaped steel beam, and the length is the same as the height of the web of the H-shaped steel beam.

[0009] The web of the T-shaped transverse stiffening rib is fully welded to the web of the H-beam, the upper flange of the H-beam, and the lower flange of the H-beam using double-sided fillet welds. The flange of the T-shaped transverse stiffening rib is welded to the upper flange of the H-beam and the lower flange of the H-beam using bevel penetration welds.

[0010] The H-shaped insert is a hot-rolled H-beam or a welded H-beam, with a cross-sectional height equal to the width of the lower flange of the H-beam, a cross-sectional width equal to the width of the flange of the T-shaped transverse stiffener, and a length of 80mm-100mm, not exceeding the thickness of the reinforced concrete floor slab.

[0011] The web of the H-shaped insert and the upper flange of the H-shaped steel beam are fully welded with double-sided fillet welds, and the flange of the H-shaped insert and the upper flange of the H-shaped steel beam are welded with equal strength by bevel penetration welding.

[0012] The studs consist of four pieces, with a diameter of 16mm, 19mm, or 22mm and a length of 80mm-100mm, embedded at the center of the thickness of the reinforced concrete floor slab.

[0013] The present invention proposes a restrained narrow-flange H-beam lower flange distortion buckling structure, the advantages of which are as follows:

[0014] 1. By symmetrically arranging T-shaped transverse stiffeners on both sides of the web to form an H-shaped composite section, the bending stiffness and bearing capacity of the transverse stiffeners are significantly increased by 3-5 times compared to the original cross-shaped section. At the same time, the top part of the beam is fixed in the reinforced concrete floor slab with H-shaped fasteners with studs, which can effectively suppress the distortion buckling deformation of the lower flange of the H-shaped steel beam, thereby enhancing the overall seismic performance and ductility of the steel structure building.

[0015] 2. The T-shaped transverse stiffeners do not protrude from the steel beams, and the H-shaped inserts do not protrude from the reinforced concrete slabs. They can be hidden within the walls and floors without affecting the building's functionality.

[0016] 3. It has a simple structure and is easy to construct, which is of positive significance for promoting the application of industrialized prefabricated steel structure systems in good houses. Attached Figure Description

[0017] Figure 1 Axonometric drawing of the lower flange distortion buckling structure of a constrained narrow-flange H-beam according to this utility model.

[0018] Figure 2 A top view of the constrained narrow-flange H-beam lower flange distortion buckling structure of this utility model.

[0019] Figure 3 A front view of the confined narrow-flange H-beam lower flange distortion buckling structure according to this utility model.

[0020] In the diagram, 1-H-shaped steel beam; 11-H-shaped steel beam upper flange; 12-H-shaped steel beam lower flange; 13-H-shaped steel beam web; 2-T-shaped transverse stiffener; 21-T-shaped transverse stiffener flange; 22-T-shaped transverse stiffener web; 3-H-shaped insert; 31-H-shaped insert flange; 32-H-shaped insert web; 4-Stud; 5-Reinforced concrete floor slab. Detailed Implementation

[0021] The following description, in conjunction with the accompanying drawings, details a specific implementation of the constrained narrow-flange H-beam lower flange distortion buckling structure proposed in this invention.

[0022] As attached Figures 1-3 As shown, a structure for constraining the distortion buckling of the lower flange of a narrow-flange H-beam is provided. The structure consists of an H-beam 1, a reinforced concrete slab 5, T-shaped transverse stiffeners 2, H-shaped inserts 3, and studs 4. The T-shaped transverse stiffeners 2 are symmetrically welded to both sides of the web 13 of the H-beam. The H-shaped inserts 3 are welded to the upper flange 11 of the H-beam and embedded in the reinforced concrete slab 5. The studs 4 are welded to the flange 31 of the H-shaped inserts and horizontally embedded in the reinforced concrete slab 5, forming a structure for constraining the distortion buckling of the lower flange 12 of the narrow-flange H-beam.

[0023] As attached Figures 1-3 As shown, the T-shaped transverse stiffener 2 is a hot-rolled T-shaped steel or a welded T-shaped steel. The width of the flange 21 of the T-shaped transverse stiffener is 100mm to 200mm, the section height is the same as the overhang width of the lower flange 12 of the H-shaped steel beam, and the length is the same as the height of the web 13 of the H-shaped steel beam.

[0024] As attached Figures 1-3 As shown, the T-shaped transverse stiffening rib web 22 is fully welded to the H-shaped steel beam web 13, the upper flange 11 of the H-shaped steel beam, and the lower flange 12 of the H-shaped steel beam using double-sided fillet welds. The T-shaped transverse stiffening rib flange 21 is welded to the upper flange 11 of the H-shaped steel beam and the lower flange 12 of the H-shaped steel beam using bevel penetration welds.

[0025] The H-shaped insert 3 is a hot-rolled H-beam or a welded H-beam, with a cross-sectional height equal to the width of the lower flange 12 of the H-beam, a cross-sectional width equal to the width of the flange 21 of the T-shaped transverse stiffener, and a length of 80mm-100mm, not exceeding the thickness of the reinforced concrete floor slab 5.

[0026] The web 32 of the H-shaped insert and the upper flange 11 of the H-shaped steel beam are fully welded with double-sided fillet welds, and the flange 31 of the H-shaped insert and the upper flange 11 of the H-shaped steel beam are welded with bevel penetration welds of equal strength.

[0027] The studs 4 consist of four pieces, each with a diameter of 16mm, 19mm, or 22mm and a length of 80mm-100mm, and are embedded in the center of the thickness of the reinforced concrete floor slab 5.

[0028] The above embodiments are merely advantages, features, and basic principles of this utility model. It should be understood that this utility model is not limited to the above embodiments. Without departing from the concept of this utility model, there may be new changes and improvements, all of which fall within the protection scope of this utility model.

Claims

1. A buckling restrained configuration for restraining distortional buckling of a lower flange of a narrow flange H- shaped steel beam, characterized by: The structure consists of an H-beam, a reinforced concrete slab, T-shaped transverse stiffeners, H-shaped inserts, and studs. The T-shaped transverse stiffeners are symmetrically welded to both sides of the web of the H-beam. The H-shaped inserts are welded to the upper flange of the H-beam and embedded in the reinforced concrete slab. The studs are symmetrically welded to the flanges of the H-shaped inserts and horizontally embedded in the reinforced concrete slab, forming a structure that restrains the distortion buckling of the lower flange of the narrow-flange H-beam.

2. The constrained narrow-flange H-beam lower flange distortion buckling structure according to claim 1, characterized in that: The T-shaped transverse stiffeners are made of hot-rolled T-shaped steel or welded T-shaped steel. The flange width of the T-shaped transverse stiffeners is 100mm to 200mm, the section height is the same as the width of the lower flange extension of the H-shaped steel beam, and the length is the same as the height of the web of the H-shaped steel beam.

3. The buckling restrained configuration for the lower flange of a restrained narrow flange H- shaped steel beam according to claim 1, characterized in that: The web of the T-shaped transverse stiffening rib is fully welded to the web of the H-beam, as well as the upper and lower flanges of the H-beam. The flanges of the T-shaped transverse stiffening rib are welded to the upper and lower flanges of the H-beam using bevel penetration welding.

4. The buckling restrained configuration for lower flange distortional buckling of a restrained narrow flange H- shaped steel beam according to claim 1, characterized in that: The H-shaped insert is a hot-rolled H-beam or a welded H-beam, with a cross-sectional height equal to the width of the lower flange of the H-beam, a cross-sectional width equal to the width of the flange of the T-shaped transverse stiffener, and a length of 80mm-100mm, not exceeding the thickness of the reinforced concrete floor slab.

5. The buckling restrained configuration for the lower flange of a restrained narrow flange H- shaped steel beam according to claim 1, characterized in that: The web of the H-shaped insert and the upper flange of the H-shaped steel beam are fully welded with double-sided fillet welds, and the flange of the H-shaped insert and the upper flange of the H-shaped steel beam are welded with equal strength by bevel penetration welding.

6. The buckling restrained configuration for lower flange distortional buckling of a restrained narrow flange H- shaped steel beam according to claim 1, characterized in that: The studs consist of four pieces, with a diameter of 16mm, 19mm, or 22mm and a length of 80mm-100mm, embedded at the center of the thickness of the reinforced concrete floor slab.

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