Segmented prestressed concrete-filled steel tube truss continuous combined bridge and construction method thereof

Abstract

The invention provides a segmented prestressed concrete-filled steel tube truss continuous combined bridge and a construction method thereof. The bridge comprises a segmented prestressed concrete-filled steel tube truss and concrete bridge deck slabs. The concrete-filled steel tube truss comprises a concrete-filled steel tube upper chord member, a concrete-filled steel tube lower chord member anda steel tube web member. Prestress is applied to the interiors of a bridge hogging moment area concrete-filled steel tube upper chord member and a hogging moment area concrete-filled steel tube lowerchord member, and the concrete-filled steel tube upper chord member and the upper concrete bridge deck slab are connected through shear connectors to form integration to work together. The characteristics that the concrete-filled steel tube tension chord member is suitable for applying prestress, and the concrete-filled steel tube compression chord member is high in bearing capacity and good in stability are comprehensively utilized; prestress is applied to the tensioned chord members in the hogging moment area, and prestress is applied to the tensioned chord members in the hogging moment area, so that the cracking risk of the concrete slab is reduced, the strength and rigidity of the section are improved, and thus ideal stress performance, construction performance and comprehensive economic indexes are obtained.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a segmented prestressed steel pipe concrete truss continuous composite bridge and a construction method thereof. Background technique [0002] The concrete filled steel pipe structure is a combined structure formed by filling concrete into the steel pipe, which can more effectively utilize the respective advantages of steel and concrete. The core concrete is in a three-dimensional compression state by means of the hoop effect of the steel pipe on the concrete, so that it has higher compressive strength and deformation capacity. Therefore, the CFST structure is mainly composed of axial compression and small eccentric compression members. [0003] The steel tube concrete truss composite bridge is a flexible application of the steel tube concrete structure, which can better solve the problem that the steel tube concrete structure is not suitable for bending, so that the ...

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Problems solved by technology

[0006] In order to solve the problems of the prior art, the present invention provides a segmented prestressed steel tube concrete truss continuous composite bridge with reasonable stress, good crack resistance, high durability and short construction period and its construction method. Concrete tension chords are suitable for applying prestress, and CFST compression chords have the advantages of high bearing capacity and good stability. By applying prestress to the CFST chords in the negative moment zone, the concrete bridge in the negative moment zone can be solved. The panel is susceptible to tension cracking, so as to obtain ideal mechanical performance, construction performance and comprehensive economic indicators

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