Seismic Response Analysis And Vibration Mitigation Research For Long Span Cable-stayed Bridges

In recent years,with the rapid development of modern economy and basic construction in our country,the development of coastal urban traffic has led to the construction of a long-span cable-stayed bridge.These large-scale project investment is huge,the construction period is long,once under the earthquake action damage,will directly cause the entire area traffic paralysis,brings the huge economic loss and the personnel casualty,therefore these long-span cable-stayed bridges under the earthquake action safety must receive the attention.Based on the actual design data of cable-stayed bridge,a finite element model is established by using the finite element software in Dalianwan Long-span cable-stayed bridge.The dynamic characteristics of Long-span cable-stayed bridge and the dynamic response law under the action of E2 earthquake are analyzed,and the damping measures of long-span cable-stayed bridges are studied.The main contents of this paper are as follows:(1)Firstly,the paper introduces the research background and significance,the characteristics and causes of bridge earthquake damage.This paper summarizes the research status of seismic response and isolation measures of cable-stayed bridge through literature review,and makes clear the main research contents.(2)This paper introduces the seismic response analysis methods of bridges,including static method,response spectrum method and dynamic Time-history analysis method,and summarizes the advantages and disadvantages of three kinds of methods and their applicable range.The most commonly used method for Long-span cable-stayed bridges is the dynamic Time-history analysis method.(3)This paper introduces the engineering survey of Long-span cable-stayed bridge in Dalian Bay,and introduces the process of establishing the finite element model of the bridge in detail.The natural vibration characteristics of the pile-soil interaction and the pile-soilinteraction are analyzed respectively,and the effect of pile-soil interaction on the natural vibration characteristics of the structure is compared and analyzed.(4)The dynamic response of the Dalianwan Long-span cable-stayed bridge under the action of ground motion is obtained by the consistent excitation of the two computational models.In this paper,the seismic response time-history analysis considering the traveling wave effect is carried out,and the effect of traveling wave effect on the large span diagonal pull is studied.(5)To study the damping measures of long-span cable-stayed bridges.Under the action of E2 earthquake,the yield bearing capacity and damping coefficient of viscous damper are studied,and the seismic response law of Long-span cable-stayed bridge and its damping effect are analyzed,and the appropriate damping device and damping device parameters are selected by Taliang.