Research Of The Long Span Cable-stayed Bridge Seismic Response Analysis

Long span cable-stayed bridge is one of the most important modern bridge types. As a result of increasing bridge span, deck flexibility and structure complexity, earth- quake analysis of long span cable-stayed bridge becomes one of the most concern and challenge problems in bridge engineering field.Earthquake analysis for long span cable-stayed bridges has two aims: the first is to ensure an enough safety margin against earthquake intensity; the second is to pro- vide scientific bases and effective ways for vibration resistance design of bridge.Lots of investigations on bridge vibration resistance show that the analysis of cable-stayed bridge acts importantly on it's ability. As longer span of cable-stayed bridge ,nonlinear earthquake analysis is another importanter problem for vibration resistance design.The classical frequency-domain theory forms a basis of bridge vibration analysis,however such method has some limitations. Some literatures show that the time domain analysis method has advantages for vibration analysis. Because of the research ontime-domain vibration analysis developed only in recent years and the theory isn't perfect enough, it needs to be made further investigation.This paper concentrates on analytical theories and methods of cable-stayed bridge responding to earthquake vibration, three-dimensional characteristic of vibration response and nonlinear effects. This paper applies ANASY software to analysize the time-domain response of cable-stayed bridge vibration, wish to get some helpful conclusion applied to bridge design.