The Seismic Response Analysis Of Double V-shaped Steel Arch Single Tower Cable-stayed Bridge

This article discusses the history and structural features of this cable-stayed bridge type, focusing on the dual-arch single tower cable-stayed bridge which appeared in recent years. Our country has high incidence of earthquakes, which always cause serious damage to our country, The research about cable-stayed bridge seismic can largely reduce the losses caused by earthquakes. In this paper, taking Fenghe Bridge(double V-shaped steel arch single tower cable-stayed bridge) as the research object. And then Carryed eigenvalue analysis and seismic response analysis of cable-stayed bridge.First of all, combining with the Finite element theory, simplify the cable-stayed bridge properly. Next, using the Midas Civil finite element software, building bridges and structural finite element model which include the interaction of pile-soil-structure. To solve the dynamic characteristics of Fenghe Bridge, the former results were further analyzed, At last, summarized the characteristics of Fenghe bridge; Referring the dynamic characteristics of Fenghe Bridge, the response spectrum of cable-stayed were analysed. On the basis of Fenghe Bridge’s seismic safety evaluation report, determine the appropriate response spectrum curve. What’s more,analysis the internal force responses and displacement responses of the key section in the rich road Feng River Bridge to seismic load; Based on the analysis of the response spectrum, Using the finite element program to establish a physical model of cable-stayed bridge pylon steel arch root steel-concrete composite segment, Analysis the mechanical properties of steel-concrete composite segment when they are under seismic loads to determine the maximum stress distribution of each composite segment part; Analysis the seismic time history response of the Fenghe Bridge, Obtained the displacement response time curve and internal force response time curve of joint section of bridge. Based on these, determine the most unfavorable position to earthquakes. Of course, the model considerd the geometric nonlinearity of the structure; Analysis the nonlinear viscous damper parameters on the result of the earthquake response of the structure sensitivity, to determine the optimal values of the damping parameter. And finally take a comparative analysis to determine the reduction and isolation effect of the structure of the bridge when damping parameter is the optimal damper.