| Modern cable-stayed bridge has been existing over half a century since Stromsund bridge in Sweden has been built. It possesses a competitive advantage in the structures of bridge with excellent figuration, favorable cost and graceful style. Thus modern cable-stayed bridge has been paid more and more attention in bridge engineering. With the increase in number and span capacity of cable-stayed bridge, earthquake response analysis becomes a major concern for most.Some widely used seismic response analysis theories of bridges are mainly introdused in this thesis. Then the constructing Jianbang Bridge, which is a prestressed concrete cable-stayed bridge with three towers and main span of 300 metres in Shangdong Province is taked as a illustrative engineering example. The author builds up an elaborate finite element model with MIDAS/CIVIL and makes an analysis for the bridge with two methods, spectrum response analysis and elastic time-history analysis of earthquake.The influence of pile group and traveling wave are studied on seismic response of long-span cable-stayed bridge. The main content of this paper includes:(1) The free vibration characteristic of the bridge is studied on the basis of two models, one of which is without piled foundation (model A) and the other one is with piled foundation (model B). Additionaly, the effect of piled foundation is analyzed on the seismic response of cable-stayed bridge in respect of the free vibration characteristic, internal force and displacement.(2) The longitudinal, transverse, vertical responses and their maximum values along with the combined seismic response are analyzed by the means of the response spectrum analysis.(3) The spectral analysis of the bridge is compared with dynamic time-history analysis considering the linear factors. The earthquake response is gained according to the calculation results of the two methods. And non-uniform seismic excitation of traveling wave effects is focused on. |
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