Studying The Seismic Of Single Tower With Single Cable Plane Large Cable Bridge In Strong Earthquake Zone

In recent years, the frequent worldwide earthquakes have caused great destructionsto bridge engineering, which made great economic and personnel loss. Single tower withsingle cable plane cable-stayed bridge, one kind of spectacle bridges, are very popular inrecent years. Due to special structure form and dynamic characteristic difference withordinary cable-stayed bridge, Single tower with single cable plane cable-stayed bridgerequires special study in seismic design, which makes it very necessary to study theseismic performances and the dynamic characteristics of such important bridges. Thestudies of this paper also have certain significance for earthquake response analysis ofthe long span cable-stayed bridge.This paper has analyzed the types and causes of the bridge earthquake damages,and has expounded the goal and design methods of bridge seismic resistance. Accordingto the 《highway bridge seismic design detailed rules》(JTG/T B02-01-2008), takingsingle tower with single cable plane cable-stayed bridge in Caofeidian industrial zone forengineering background, considering the different connection vertical way of tower withbeam, this paper has made an analysis taking the response spectrum method from thepoint of seismic performance. According to the lasso sag nonlinear effect andpile-soil-structure interaction, taking the different levels of ground motion inputting,expounding finite element model by the ANSYS software, this paper has analyzeddynamic properties and seismic performances.This paper make the program election according to the tower, beam in the differentconnection vertical way, from the view of the seismic performance analysis, it result thatbetween the beam, tower in longitudinal using elastic connected device to the seismicstructure is advantageous; For the selected elastic connecting scheme, this paper makethe parameters analysis of the spring stiffness and the elastic connection systemoptimization design; Flexible connection device choice viscous dampers is moreadvantages than rubber support device. Through the nonlinear time history analysis,beam and tower in the longitudinal use damper design parameters for dampingcoefficient C=12000and speed index ξ=0.3, under the P1and P2submitted seismicaction, the main tower, transition pier, pile foundation can meet the requirements of theperformance objectives, basic structure is safe.