A Research On Seismic Performance Of The Long Span Cable-Stayed Bridge

Because of bridge design theory,construction methods and new materials have been developed significantly in recent decades,the quantity and span of cable-stayed bridge growing fastly,the cable-stayed bridge gradually becomes a main type of the long-span bridge。As a transport hub in the long-span bridge construction,once damaged in the earthquake,will not only result in enormous direct economic losses but also give big difficulties in disaster relief work because of Serviceing as a lifeline and the importance。Therefore,the precise and effective seismic design on cable-stayed bridge to ensure the seismic safety have great significance。On the basis of large amounts of information,this paper introducts the cable-stayed bridge seismic response,the main reasons to cause damage,anti-seismic features,the current situation and problems in detail。Useing the seismic methods—david amendment method do seismic design on cable-stayed bridge(including details in the design process and how to deal with,seismic limit state,the selection of parameters)。On the basis of theoretical design,we checked its anti-seismic using the two anti-seismic analysis Methods commonly used response spectrum and time-response analysis method。The ideology seismic design of the cable-stayed bridge is that the internal forces and displacements are smaller and better,circumstances,but these two aspects are often contradictory normally,to make smaller internal forces of reaction,often have to pay the cost of larger displacement,and vice versa。On the basis of theoretical research of the past bridge workers,research of modern seismic design on the cable-stayed bridge。From the norms of improvement,the new application design method,the seismic design process and specific aspects,to specific the long-span bridge(cable-stayed bridge) seismic design。Combining specific example——Liaoning Yingkou Highway Bridge seismic study,a detailed calculation of the dynamic characteristics,response spectrum and the time-history analysis is done, through the calculating results to find the influencing factors of the cable-stayed bridge。By analyzing we can see that:cable-stayed bridge system,the border restrictive conditions has a certain impact on the bridge seismic design。Besides,the earthquake response is greatly different between Shun qiaoxiang and Heng qiaoxiang and differemt parts of the bridge。Combination of theoretical and computational results,damping seismic measures and the seismic future prospects of cable-stayed bridge have been made。In this paper,the law serving as the bridge seismic design can be used on other similar bridge seismic analysis and has some reference value。...