Concrete-filled tube web member combined box girder

Abstract

The invention discloses a concrete-filled tube web member combined box girder, which comprises a pre-stressed concrete top plate, a pre-stressed concrete bottom plate, a plurality of concrete-filled tube web members, a plurality of connecting pieces and a plurality of shear connectors, wherein the pre-stressed concrete top plate and the pre-stressed concrete bottom plate are arranged up and down along the horizontal direction; the concrete-filled tube web members consist of steel tubes and concrete cores; the plurality of concrete-filled tube web members are connected between the pre-stressed concrete top plate and the pre-stressed concrete bottom plate in a herringbone through the shear connectors arranged on the end parts of the concrete-filled tube web members to form a main body of the box girder; and each connecting piece is connected between two adjacent concrete-filled tube web members. According to the concrete-filled tube web member combined box girder, the concrete-filled tubes are taken as the web members, so the compressive capacity of the stressed web members can be improved; and prestress can be applied to the pulled web members according to requirements, so the pulling stress level is reduced and even the web members can be kept in the compressive stress state. The concrete-filled tube web member combined box girder has the advantages of wide application range, reasonable structural design and the like.

Description

technical field [0001] The invention belongs to the technical field of bridge structure design and construction, in particular to a composite box girder with steel tube concrete web members. Background technique [0002] Corrugated steel web prestressed concrete composite box girder is a form of box girder in which flat steel plates are bent into corrugations to replace concrete webs on prestressed concrete box girders. It has high bearing capacity, high rigidity and unit weight. Low-level characteristics, and can improve the stability of the structure and the use efficiency of materials, convenient transportation and hoisting, short construction period, high efficiency, and significant economic benefits. The use of corrugated steel webs can reduce the thickness of the webs, thus eliminating the need for stiffeners to prevent local buckling, thus helping to resolve the contradiction between web thinning and stability that has plagued the engineering community for a long time...

AI Technical Summary

Problems solved by technology

However, in order to ensure that the shear force on the corrugated steel web on the prestressed concrete composite box girder can be effectively transmitted to the upper and lower concrete roofs, an appropriate shear key connection must be selected to ensure that the corrugated steel web is prestressed. The transverse stiffness and torsional stiffness of the concrete composite box girder make the construction of the corrugated steel web prestressed concrete composite box girder more difficult

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