Reinforced concrete combined box girder with steel tube-steel plate combined web

Abstract

The invention discloses a reinforced concrete combined box girder with a steel tube-steel plate combined web, and relates to the technical field of bridge projects. The reinforced concrete combined box girder with the steel tube-steel plate combined web mainly includes a concrete roof, a concrete floor, a striping structure and a steel tube-steel plate combined web. The steel tube-steel plate combined web, the concrete roof and the concrete floor are connected to form a box girder main body, and the striping structure is arranged at the two end fulcrums and the middle of the box girder main body. According to the reinforced concrete combined box girder with the steel tube-steel plate combined web, the self-weight of a bridge is reduced, the spanning capacity of the bridge is enhanced, thecracking of a web is avoided, the efficiency of prestress putting is improved, and the secondary internal force caused by temperature effect and shrinkage and creep of concrete is decreased. Therefore, the advantages of two materials, steel and the concrete, are fully taken, and so good economic efficiency is provided.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a steel-concrete composite box girder with steel pipe-steel composite webs. Background technique [0002] Concrete box girders are often used as the preferred structural form of medium- and long-span bridges because of their high flexural and torsional stiffness. However, concrete box girder bridges are generally prone to two diseases: web cracking at the girder root (beam end); and mid-span deflection continue to decrease. Many long-span prestressed concrete girder bridges at home and abroad have serious diseases. The reason is that the weight of the concrete box girder is relatively large, the bending moment and shear force at the root of the box girder are relatively large, and the web and the top and bottom plates are connected as a whole, the stress caused by the temperature difference between the top and bottom plates and the drying shrinkage and creep of the web...

AI Technical Summary

Problems solved by technology

However, concrete box girder bridges are generally prone to two kinds of diseases: web cracking at the girder root (beam end); mid-span deflection continues to decline, and many long-span prestressed concrete girder bridges at home and abroad have serious diseases

The reason is that the weight of the concrete box girder is relatively large, the bending moment and shear force at the root of the box girder are relatively large, and the web and the top and bottom plates are connected as a whole, the stress caused by the temperature difference between the top and bottom plates and the drying shrinkage and creep of the web The concentration problem is more prominent, resulting in web cracking, which seriously affects the load-bearing performance and durability of the structure

[0003] In order to solve the above two common problems of concrete box girders, one solution is to use flat steel webs instead of concrete webs. The flat steel webs have high shear strength and light weight, but the longitudinal stiffness of the flat steel webs is large and will lose The longitudinal prestress should be applied to the concrete structure, and the longitudinal and transverse stiffeners must be welded to prevent buckling, which wastes materials and complicates the structure

Another solution is to use corrugated steel plates instead of concrete webs. The corrugated steel plates have a large out-of-plane rigidity and do not need stiffeners. At the same time, the longitudinal rigidity is small, which has a wrinkle effect and improves the efficiency of prestressing. However, the corrugated steel web composite box girder also Low shear rigidity, large shear deformation, complex manufacturing and processing of folded steel webs, requiring specific processing equipment, difficult welding, high cost, and difficult to use in long-span girder bridges

Images