Study On Seismic Response Analysis Of Long-span Cable-stayed Bridge And Seismic Isolation Design

The Hong Kong-Zhuhai-Macao bridge is a large project connecting the places of Guangdong, Hong Kong and Macao, which is related to China national economy. The characteristics of this bridge are higher demand for the load standard, structural performance, management programs, safety standards, and the requirements higher investment and unique geography and political significance. Therefore, the seismic analysis and seismic design of Qingzhou sea channel bridge are researched in the paper, the main content as follows.(1) The self-vibration characteristics of Qingzhou sea channel bridge are calculated by the modal analysis method, considering beam, shell, solid elements and other models and pile-soil interaction effect.(2) In the low-level earthquake, the seismic response analysis based on the response spectrum analysis and elastic time-history analysis are calculated for Qingzhou sea channel bridge, considering geometrical non-linearity and prestressing effect, and the analysis results such as twave effect and their comparison are given.(3) The seismic response analysis under the high-level earthquake are calculated for Qingzhou sea channel bridge, using geometrically and materially nonlinear time-history method to calculate the displacements, bending moments and axial forces in the worst members along the longitudinal and vertical directions of the main span of the bridge.(4) The eismic response analysis by the time-history method under the low and high level earthquake are calculated for Qingzhou sea channel bridge considering different isolation systems, the sensitivity analysis to the reasonable nonlinear viscous dampers and the effect of ball bearings on the seismic performance of the bridge, are presented in the paper.