Finite Element Analysis On Rigid-Framed Through Tied-Arch Bridge With Concrete Filled Steel Tublar

Based on rigid-framed through tied-arch bridge with concrete-filled steel tublar, this thesis builds up a integrated and elaborate finite element model with MIDAS/CIVIL, a large-scale FEM software, to discuss and analyze the CFST arch bridge's static behavior, shrinkage, creep, stability and dynamic characaters. The paper first calculates the structure behaviors of this kind bridge under loads of all construction stages and entire bridge stage, especially simulating the structure system change from steel tube to concrete filled steel tube, analyzing the effects of prestressing force, shrinkage, creep, differences of full temperature and part temperature and ten-type load combinations to the bridge, then computes the seismic responses of pile foudation bridge combined with the interaction of pile earth structure, which include the strcutural self-vibration characteristics and the seismic response characteristics calculated by the means of the response spectrum analysis and the time history analysis, finally calculates the structural stability and discusses the main influencing factors of the structure stablity. Therefore, the static, dynamic, stable behavior and computing method of large span bridge are comprehensively understood.