Analysis Of Seismic Response Characteristics Of Curved Cable-stayed Bridges And Its Influence Factors

Curved cable-stayed bridge is the bridge that has its main girder arranged curvedly to fit the curved lane.Because of the curved main girder,under the bending-twisting coupling effect,curved cable-stayed bridge performs as a space coupling structure.And this situation makes the spatial arrangement of stay cable complicated,so that the strained condition of the whole structure under the dynamic load becomes complicated.Hence,it is necessary to analyse the seismic response characteristics of curved cable-stayed bridge.With Brazaville riverside drive curved cable-stayed bridge as engineering background,this thesis establishes a finite element modle of this bridge,and analysed the seismic response characteristics and its influence factors.The main contents of this dissertation are as follows:1.The main types of seismic disarsters and existing seismic response analysis methods are summarized.And a research overview about current study on seismic analysis of cable-stayed bridge is also analyzed and summarized.2.Finite element simulation of curved cable-stayed bridge with appropriate element types is established.Based on finite element modle,the dynamic characteristics of this bridge are deeply analyzed.And the change regularity of dynamic characteristics with different girder central angle and supporting system are studied.3.Based on Bresler yield surface function,this paper inferred a new method to find the seismic critical angle using the CQC method of modes combination,with two orthogonal response spectrums considered.And then,the seismic critical angle are gained,with the finite element calculation of different seismic angle using response spectrum method.And based on seismic critical angle,the displacement and internal force response characteristics are analyzed.4.Considering seismic soil pile superstructure interaction and traveling wave effect,intensive studies on curved cable-stayed bridge seismic response characteristics with different girder central angle and supporting system are researched.