| The long span arch and rigid frame composite-system bridge appears lately in China. It is a new type of bridge with complex structure. This type of bridge utilizes powerful stiffness of rigid frame to supply extension bearing for steel arch rib which is rigidly connected with rigid frame and minishes long span effect relatively, so it is propitious to increase the length of main span.This thesis focuses on the design scheme of Xinguang Bridge which is under construction in Guangzhou. A large-scale FEM software MIDAS/CIVIL is used to establish the integrated finite element model of this bridge, in order to discuss the problems of the static stucture behavior, dynamic characateristics and stability of this style of bridge.The structure behavior of all construction stages and completed bridge stage under dead load, live load, temperature load, wind load, running water pressure and various types of load combinations are computed in this thesis, especially analyzing the effect of concrete time-dependent effect on bridge structure. The dynamic characateristics of this bridge and the influence of longitudinal caging device in bridge deck on natural vibration frequency are discussed in this thesis. And then, seismic responses are studied by response spectrum method and main factors which influence elstatic stability of structure are discussed. Lastly, it draws conclusions about all parts of computation contents to be consulted.
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