CN-224228100-U - Structure for improving section grade of composite beam through double-stiffening rib

Abstract

The utility model provides a structure through two stiffening ribs improvement combination beam section grades, including girder steel, vertical stiffening rib and short stiffening rib, concrete floor passes through the connecting piece with the girder steel and connects, the girder steel has the neutralization axle, the above part of neutralization axle forms the pressurized district, install vertical stiffening rib and short stiffening rib in the girder steel outside, vertical stiffening rib is located neutralization axle department, vertical stiffening rib is in the web both sides symmetry arrangement of girder steel, short stiffening rib is located between girder steel T shape pressurized district and the vertical stiffening rib, short stiffening rib is along the vertical even interval arrangement of girder steel, short stiffening rib is in the web both sides symmetry arrangement of girder steel. This novel through set up the reinforcement of two stiffening ribs at the pressurized district of girder steel, with the T shape pressurized district reinforcement of girder steel for H shape cross-section, short stiffening rib provides the side direction for the top flange simultaneously and supports, avoids local buckling, makes top flange and web pressurized district all satisfy the requirement of S1 cross-section level, has improved the bending-resistant bearing capacity of composite girder simultaneously.

Inventors

• ZHANG KEWEI
• LIU ZHIXIN

Assignees

• 安徽省建筑设计研究总院股份有限公司

Dates

Publication Date

20260512

Application Date

20250225

Claims (5)

1. 1. The structure for improving the section grade of the composite girder through the double-strength ribs comprises a steel girder (1) and a concrete floor (5), and is characterized in that the concrete floor (5) is connected with the steel girder (1) through a connecting piece (6), a pressure receiving area is formed in the upper portion of the steel girder (1) and provided with a T-shaped pressure receiving area (3) of the steel girder (1) and the concrete floor (5), longitudinal stiffening ribs (21) and short stiffening ribs (22) are arranged on the outer side of the steel girder (1), the longitudinal stiffening ribs (21) are located at the position of the neutralization shaft (4), the longitudinal stiffening ribs (21) are symmetrically arranged on two sides of a web of the steel girder (1), the short stiffening ribs (22) are located between the T-shaped pressure receiving area (3) of the steel girder and the longitudinal stiffening ribs (21), the short stiffening ribs (22) are evenly distributed at intervals along the longitudinal direction of the steel girder (1), and the short stiffening ribs (22) are symmetrically arranged on two sides of the web of the steel girder (1).
2. 2. A structure for improving the cross-sectional grade of a composite girder by means of double-stiffening ribs according to claim 1, characterized in that the longitudinal stiffening ribs (21), the short stiffening ribs (22) and the steel girders (1) are welded.
3. 3. The structure for improving the sectional grade of the composite girder through the double-rib according to the claim 1, wherein the steel girder (1) is provided with an upper flange, a lower flange and a web, and a web compression area is formed between the upper flange and the upper side of the neutralization shaft (4) of the steel girder (1).
4. 4. A structure for increasing the cross-sectional grade of a composite girder by means of double ribs according to claim 1, characterized in that the connecting piece (6) is a peg welded to the upper flange of the girder (1).
5. 5. A structure for improving the cross-sectional grade of a composite girder by means of double-bracing according to claim 1, characterized in that the connecting element (6) is a channel steel welded to the upper flange of the girder (1).

Description

Structure for improving section grade of composite beam through double-stiffening rib Technical Field The utility model relates to the technical field of steel structures, in particular to a structure for improving the section grade of a composite beam through double-rib. Background In recent years, the requirements of the existing building reconstruction projects on the steel structure reinforcement technology are higher and higher, the bending resistance bearing capacity of the original steel girder can not meet the use requirements due to the reasons of the change of the using functions of the building, the newly added partition wall body, the improvement of the load subentry coefficient and the like, and the bending resistance bearing capacity of the steel girder can be improved by considering the combined girder under the action of the concrete floor slab. The existing steel structure design standard (GB 50017 2017) requires that the composite beam needs to meet the S1 section grade of the plastic design requirement, and meanwhile, the arrangement requirement of bolts is provided to restrain the pressed flange, but the arrangement of bolts of the conventional composite beam is difficult to meet the requirement of restraining the pressed flange, and the web plate of the steel beam is thinner, so that the requirement of the S1 section grade is more difficult to meet. Meanwhile, even if the original steel beam is designed according to the combined beam, the requirement of the steel structure design specification (GB 50017 2003) on the width-thickness ratio of the web is lower, which is equivalent to the S2 section grade of the current steel structure design standard (GB 50017 2017), the requirement of S1 cannot be met, and the web is reinforced at the moment. The conventional reinforcement mode comprises the steps of cutting a concrete floor slab, cutting off studs, re-welding the studs, encrypting the stud spacing, pouring concrete, and adhering steel to the whole web of the steel beam for reinforcement, so that the original structure is damaged, steel is wasted, and the construction process is complex. Therefore, the structure for improving the section grade of the combined beam through the double-rib is provided, and the web plate and the upper flange of the pressed area of the steel beam are reinforced, so that the steel beam meets the requirement of the section grade S1. Disclosure of utility model Aiming at the problems in the prior art, the utility model provides a structure for improving the section grade of a composite beam through double-stiffening ribs. In order to achieve the above purpose, the present utility model provides the following technical solutions: The structure for improving the section grade of the composite girder through the double-stiffening ribs comprises a steel girder and a concrete floor slab, wherein the concrete floor slab is connected with the steel girder through a connecting piece, the steel girder is provided with a neutralization shaft, a compression area is formed above the neutralization shaft and comprises a T-shaped compression area of the steel girder and the concrete floor slab, longitudinal stiffening ribs and short stiffening ribs are arranged on the outer side of the steel girder, the longitudinal stiffening ribs are symmetrically arranged on the neutralization shaft, the longitudinal stiffening ribs are symmetrically arranged on two sides of a web of the steel girder, the short stiffening ribs are located between the T-shaped compression area of the steel girder and the longitudinal stiffening ribs, the short stiffening ribs are uniformly arranged at intervals along the longitudinal direction of the steel girder, and the short stiffening ribs are symmetrically arranged on two sides of the web of the steel girder. As a further improvement of the scheme, the longitudinal stiffening ribs, the short stiffening ribs and the steel beams are all welded. As a further improvement of the scheme, the steel beam is provided with an upper flange, a lower flange and a web, and a web compression area is formed between the upper flange and the upper part of the middle shaft of the steel beam. As a further improvement of the solution, the connecting piece is a peg, which is welded with the upper flange of the steel beam. As a further improvement of the scheme, the connecting piece is a channel steel, and the channel steel is welded with the upper flange of the steel beam. Compared with the prior art, the bending-resistant composite girder has the beneficial effects that the T-shaped compression area of the girder is reinforced into the H-shaped section by arranging the double-rib reinforcement in the compression area of the girder, meanwhile, the short stiffening rib provides lateral support for the upper flange, local buckling is avoided, the compression areas of the upper flange and the web meet the requirement of S1 section grade, and meanwhile, the bending-resistant bea