| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 92 === Abstract
A finite element computation procedure for linear and non-linear static and dynamic analysis of three-dimension long-span cable-stayed bridge under action of live loads and seismic loads is presented in the study. The system equation of cable-stayed bridges including the nonlinearities due to large displacement, beam-column and cable sag effects is first set up and compared with the results of the linear computation procedure. the Kao-Ping-Hsi cable-stayed bridge in Kao-hsiung, Taiwan is taken as example. First of all, the initial shape of cabled-stayed bridge is determined by using shape iteration technique. Based on the initial shape the linear static deflection, natural frequencies and modes, linearized and nonlinear dynamic responses seismic action are determined. In order to examine the behavior of the cable-stayed bridge under strong seismic excitation, five different combinations of seismic excitation are applied in this paper. It is shown in the numerical results that this bridge is mainly controlled by the horizontal X seismic excitation along the direction of girder axis. The results also show that geometric nonlinear effects and vertical seismic excitation have to be considered in the seismic analysis of cable-stayed bridge.
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