Earthquake Response Analysis Of Cable-Stayed Bridges And Research On Seismic Mitigation And Isolation Measures

With the continuous improvement of my country’s transportation system,many large-span bridges have been built.among which cable-stayed Bridges have been widely used in bridge engineering due to their good mechanical performance and large span capacity.However,in recent years,earthquake disasters have occurred frequently,seriously endangering human life and property safety.Among them,long-span bridges represented by cable-stayed bridges,as the hub of the transportation system,play a key role in the rescue channel after the earthquake.Therefore,the seismic response of cable-stayed bridges and their anti-seismic measures have attracted much attention.This paper takes a large-span cable-stayed bridge as the engineering background and conducts the following researches:1.Briefly describe the development history of cable-stayed bridges,the experience and lessons of bridge failure in earthquakes,and the current seismic response analysis methods,and introduce the research status of viscous dampers and lead rubber bearings and their engineering applications.2.The finite element software is used to simulate the consolidation of the pier bottom and the pile-soil effect,that is,the difference in dynamic characteristics of the structure under the two conditions of whether to build a pile foundation is considered.3.Based on the pile-soil spring model,time history analysis under different seismic input modes was carried out,and the results were checked with the response spectrum.The effect of traveling wave on the seismic response of cable-stayed bridge is discussed.4.Through the arrangement of viscous dampers on cable-stayed bridge and the nonlinear time-history analysis of the structure,the influence of different viscous dampers and damper parameters on the structure is discussed.5.Establish the research conditions of different types of lead rubber bearings and their layout positions,analyze them by using nonlinear time-history analysis methods,and then discuss the seismic effect of the seismic isolation bearings.6.The mixed shock isolation system of viscous dampers and lead-core rubber bearings was adopted to study the seismic performance of the structure,and the scheme of damping viscous dampers and lead-core rubber bearings was compared and analyzed.