The Analysis On Mechanical Property Of Maocaojie Long-span Bridge Model Test

With the rapid development of long-span concrete-filled steel tubular tie-arch bridge, the static analysis and the stability analysis in construction stage and on the completion are paid to more and more attention. Therefore ,the research on the static analysis and the stability analysis of concrete-filled steel tubular tie-arch bridge has great engineering value and theory significance. In this thesis, the research results of domestic and overseas scholars on static and stability of Concrete-Filled Steel-Tube Arch Bridge are roundly summarized. The technique on birth and death of element in ANSYS and geometrical nonlinear are applied to Forward-simulation analysis, as a result the simulation analysis becomes more simple and accurate. Then on the basis of model of MAOCAOJIE Bridge of NANXIAN Country in HUNAN Province, the finite element model is constructed. The test dates which are collected from construction stage after steel tube closed and the static loading test are contrasted and analysed with the simulation analysis. As a result, it proves that the simulation analysis is accurate and gets a some regulation conclusion. Then the stability analysis theory is simpliedly introduced. The linear elastic stability analysis is applied theory to analyz the stabiltiy capacity of construction and completed stage and analyzs the effection on stability analysis if the cables are reserved. At last the geometrical nonlinear stability analysis and the double nonlinear stability are applied the operation stage with the least stabiltiy capacity. The results show that double nonlinear stability analysis is necessary and important. At last, the effects of different loading sequence and wind loads on stability capacity of long-spar concrete-filled steel tubular tie-arch bridge are dicussed through threemethods of stability analysis to analyze. The related conclusion is shown up.