Study On The Temperature Effect Of Concrete Filled Steel Tubular Arch-Bridge

Of the concrete filled steel tubular (CFST) arch-bridge, significant development has been made in our country during the past ten years mainly thanks to the features of dexterous structure, artistic shape, super spanning capacity and convenience in site work. Due to the difference in materials and structure between CFST arch-bridge and normal concrete structures, the temperature field and its effect of CFST bridges are different from that of the normal concrete structures. At Present, there are few literatures on the temperature field and its effect of CFST bridges available due to the short research history, and no code captures the calculation of the temperature field and its effect of CFST bridges. It is beneficial to study the temperature field and its effect of CFST bridges.This paper presents the calculation method of nonlinear temperature field of CFST arch-bridge under solar radiation according to heat exchange finite element method (FEM) and temperature field theory of concrete. Based on the analyses on the literatures of the temperature field of the tested CFST elements, the annual linear difference calculation method of CFST arch-bridge is proposed in terms of parameter evaluation. Exemplified by the Wangchangdong river CFST arch-bridge, two case studies, which correspond to CFST tied-arch-bridge model and CFST arch-bridge model, respectively, are analyzed with a FEM code. In these two model calculations, the temperature field and its effect of CFST arch-bridges are calculated and conclusions are presented in terms of both temperature features and calculating methods.The conclusions of this thesis are not only useful to the design of CFST arch-bridges and the revising of related codes, but also valuable to further study on the temperature effect theories of CFST arch-bridges.