DESIGN OPTIMIZATION OF STEEL TUBEWALL THICKNESS OF CONCRETE-FILLED STEEL TUBULAR ARCH BRIDGE

Lan Zhang and Yao Xie

Keywords

Concrete-filled steel tubular (CFST) arch bridge, wall thickness, steel ratio, optimization

Abstract

As the main load-bearing component of a concrete-filled steel tubular arch bridge, the calculation of ultimate bearing capacity of archring is the key of structural design. The ultimate bearing capacity of a concrete-filled steel tube arch bridge is mainly related to hoop coefficient, initial stress of steel pipe and concrete shrinkage and creep. To optimize the design of a steel pipe wall thickness of arch bridge, a general relationship between section steel ratio and hoop coefficient, initial stress of steel pipe and concrete shrinkage and creep is derived. The design method of steel pipe wall thickness for a large-span concrete-filled steel tube arch bridge is proposed. A finite element model based on the Xianghuoyan Bridge is established. The research results show that the strength, stiffness, and stability of the bridge meet the requirements of the JTG/T D65-06-2015standard when the steel pipe wall thickness is optimized. The design method can provide theoretical basis for the design of a large-span concrete-filled steel tube arch bridge in the future.

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