Study On Design Parameters Affecting The Seismic Response Of Asymmetry Continuous Rigid Frame Bridges

Along with the national economy's development, the long span bridge is developing quickly in our country, and the long span continuous rigid frame bridge is one of the most widely application bridge types, there were lots of this bridge built and building in our country. At the same time, our country is muti-seismal, therefore, the bridge construct as the lifeline project, especially the long span bridge construct, it is necessary and essential to make a detailed and deeply analyze the reaction of earthquake effect.Limitations because of various circumstances, such as terrain, navigation requirements, continuous rigid frame bridge often have to use asymmetric structure. The purpose is to seek the seismic sensitive parameters of asymmetry lone span continuous rigid-frame bridge through plentiful numerical analyses. To guide the seismic design and seismic fortification.In the Paper, In order to seek the sensitive parameters of the bridge type under earthquake, calculation models of the asymmetry large-span curved continuous rigid frame bridges are proposed with finite element methods, respectively. The dynamic behavior and seismic performance are analyzed. The substructure and superstructure of the continuous asymmetric rigid frame bridge were carried out asymmetrical design parameters and design parameters seismic performance impact analysis. Of the factors are: (1) Substructure: Pier height asymmetry, pier type of asymmetry; (2) Superstructure: T structure with a cantilever length of the asymmetry around the main beam, main beam structure of different T asymmetric cantilever length.Using response spectrum and time history analysis method, separately for different models and the lateral direction along the bridge to seismic response analysis, the main response peak obtained with the variation of each parameter. In a large number of numerical analysis based on the obtained asymmetric continuous rigid frame bridge under earthquake some useful conclusions, for the same bridge design reference.