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PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, G. Montero and R. Montenegro
Ultimate Load Capacity Analysis of a Long-Span Rigid-Frame with a Flexible Concrete Filled Steel Tubular Arch Bridge
G.J. He1, K.K. Peng1, S.D. Luo2 and A.G. Yan2
1Central South University of Forestry and Technology, Changsha, Hunan, P.R. China
G.J. He, K.K. Peng, S.D. Luo, A.G. Yan, "Ultimate Load Capacity Analysis of a Long-Span Rigid-Frame with a Flexible Concrete Filled Steel Tubular Arch Bridge", in B.H.V. Topping, G. Montero, R. Montenegro, (Editors), "Proceedings of the Eighth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 23, 2006. doi:10.4203/ccp.83.23
Keywords: long-span bridge, geometric nonlinear, material nonlinear, ultimate load capacity.
Since the 1990s, concrete filled steel tubular (CFST) arch bridges have been rapidly developing in China. However, the Yichang Yangtze railway bridge is the first and currently the longest span bridge in China constructed from a combined rigid-frame beam with a flexible CFST arch. It is on the new railway line from Yichang to Wan County over the Yangtze River. The bridge spans are one of 130m, two at 275m each and a final span of 130m. It is under construction and will be completed in 2006. The cross section of the main beam is a box with two cells and gradient webs.
With the increase in train axle load and speed, researching the ultimate load capacity for this bridge is necessary for both design and service. For in situ bridge measurement, the response of displacement and stress-strain are mostly in the elastic range, and scarcely in the ultimate state. However, in the experiments on models in the laboratory, the effects of structural dimensions on the mechanical behavior are significant, especially for civil engineering structures such as long-span bridges.
The mechanical behavior and load response history appears to have been studied only for single circle arch rib, and there has been very little research for integral CFST arch bridges [1,2,3]. Based on the virtual work principles and nonlinear finite element theory, a reasonable method to analyze the double nonlinear problem of structures has been developed in this paper, in which the elastic-plastic constitutive matrix was considered with a geometric nonlinear finite element formulation.
Furthermore, several basic concepts for the structural ultimate load capacity are summarized and compared.
Three different types of three-dimensional finite element model were developed in the present paper, which are the back-bone model, the space beam girder model and the three-dimensional solid model. Considering the geometric and material non-linearity, the ultimate load capacity of the Yichang Yangtze Bridge has been calculated. The effects of different non-linearity parameters on the ultimate load capacity are discussed.
The results show that material non-linearity is more important than geometric non-linearity in the ultimate load capacity analysis
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