Analysis On The Effect Of Variations In Structure Parameters Upon The Seismic Response Of A Six Tower Cable-Stayed Bridge

As an important traffic lifeline projects, long-span multi-tower cable-stayed bridges have rapidly developed both at home and abroad for its strong spanning capacity and elegant appearance. But due to its complicated structure,once damaged in the earthquake.it will lead to huge economic losses and seriously affect the relief work and reconstruction in the disaster zone.Therefore, whether the structural parameters which could affect seismic performance of long-span multi-tower cable-stayed bridge were correctly selected or not, was very important in reasonable structure form selection and seismic design.Based on the basic theory of seismic response analysis, the time history analysis of Jiashao Bridge, which is a long-span six-tower cable-stayed bridge, was investigated with different structure parameters. The main work has been listed as follows:1. The development history and the current research situation of seismic response of multi-tower cable-stayed bridge were summarized.2. While the certainty analysis method of bridge seismic theory which includes static method, response spectrum method and time history analysis method was compared, the merits and demerits of these methods were concluded.3. The finite element models of Jiashao Bridge, of which the structural parameters were changed, were established by MIDAS on the basis of the finite element theory. Then the change of structure parameters’influence on bridge seismic properties was studied by compared the calculation results.4. Analysis the models which changed structure parameters under uniform excitation by time history analysis and compared calculation results to study the change of structure parameters’influence on bridge seismic performance, and provide a reference for the select of reasonable structure parameters of similar bridge.