Transversal Stability And Transversal Seismic Resistance Of Large Span CFST Arch Bridge

Based on the research of Concrete Filled Steel-tube (CFST) arch bridge, the geometrical nonlinearity , material nonlinearity and both nonlinearities of large span CFST arch are taken into account in this paper. The nonlinear stability and seismic resistance of large span Concrete Filled Steel-tube (CFST) arch bridge of different transversal supports are studied in this paper.The study demonstrates: vertical displacement of the rib of arch bridge is influenced by geometrical nonlinearity and material nonlinearity, and the geometrical nonlinearity has less effect on the vertical displacement while the material nonlinearity should be more considered. If both nonlinearities are considered, the result would be precise.In order to study the structural internal forces, it is necessary to analyze and simplify the model of whole bridge. The analysis about boundary restrain, transversal support, arch rigidity and transversal beams is studied according to the difference between the actual bridge and the model. After the comparison with some models, it is distinct that the reinforcement of transversal support is more beneficial than the improvement of arch rigidity .Based on the analysis of nonlinear stability of some models, the load factor of I-type transversal support is 0.52, while the load factor of K-type transversal support is 0.59. The analysis of the transversal seismic effect demonstrates that the reaction on the top of arch with K-type transversal support is stronger than that with I-type transversal support.Between the transversal stability and the transversal seismic resistance, the paper suggests that feeble supports be placed near the top of arch, while the strong supports should be placed near L/4 and arch feet.