Analysis Of Mechanical Behavior Of Long Span Railway Steel Truss Cable-Stayed Bridge During Construction

According to the characteristics of the railway long span steel truss cable-stayed bridge, this thesis focuses on the study of the features of the railway cable-statyed bridge in construction process. The main contents of the thesis are constisuted of two parts:the analysis of the features of the railway cable-stayed bridge in construction process and geometric nonlinear behavior of this type of structure during construction.Firstly, the features of the railway cable-statyed bridge in construction process are introduced. Then according to the characteristics of the railway long span cable-stayed bridge, the whole construction process finite element model of Hanjiatuo Yangtze River Raliway Bridge is simulated. By studying the deformation and the internal force of some important structures such as tower, main trusses, calbe, etc. during overall process, the cable-stayed's mechanical behavior during construction will be estimated. At last, for further understanding the features of the railway cable-statyed bridge in construction process, the different influence of some impact parameters to the bridge deformation and the stress of the cables between the railway cable-statyed bridge and the Highway cable-statyed bridge during some typical process are showed.Secondly, based on the construction of the Hanjiatuo Yangtze River Raliway Bridge, the whole construction process is simulated using the large and general and finite software ANSYS, the calculation includes linearity, part nonlinearity (do not consider the sag effect) and complete nonlinearity. Then it is analyzed the geometric nonlinear hehavior in the maximum symmetric cantilever stage, maximum single cantilever stage, the post cast stage and live load stage. By studying deformation and the internal force during the above stages, the magnitude and rule of geometric nonlinear effects of the railway long span steel truss cable-stayed bridge are fully researched.