Analysis of Ultimate Load-Bearing Capacity of Long-Span CFST Arch Bridges

Abstract:

In order to study the ultimate load-bearing capacity of the long-span concrete-filled steel tubular (CFST) arch bridge with fly-bird-type, the ANSYS finite element program was used to establish its special model, and to study ultimate load-bearing capacity of this bridge with three different methods. The constitutive relation factors of concrete-filled steel tubular was taken into consideration including confining effect ultimate load coefficients, failure modes, and load-displacement curves of this bridge under different cases. The result indicate that the ultimate load-bearing capacity of the bridge can meet the requirement, all of its failure modes is out-plane, the two methods, linear elastic buckling analysis and only geometric nonlinearity analysis, will over high estimate ultimate load-bearing capacity of this bridge, and linear elastic buckling method cannot reflect real failure mode of this structure. In order to correctly estimate the ultimate load-bearing capacity of the bridge structure, the effect of geometric and material double nonlinearity couldn’t be neglected.

• Periodical: Applied Mechanics and Materials (Volumes 90-93)
• Pages: 1149-1156
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.90-93.1149
• Online since: September 2011
• Authors: Yang Liu, Da Wang, Yi Zhou Zhu
• Keywords: Bridge Engineering, CFST Arch Bridge, Method of Double Nonlinearity, Method of Linear Elastic, Method of Nonlinear, Ultimate Load-Bearing Capacity

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