| The cable-stayed bridge,a kind of indeterminate flexible structure with many redundant degrees, consists of three basic members: towers, cables and girders. The cable-stayed bridge with single tower usually includes two types:bilateral symmetry and bilateral asymmetry. Asymmetric tend on disposition cable-stayed bride is a new cable-stayed bride. Back-stays of this kind of bride not only can provide resisting moment for tower, but also can chance the whole bride's property through adjust cable tension. So,this kind of cable-stayed bride appears different regular rule with ordinary cable-stayed bride when strained an aberration exist under external load.In the cantilever construction and service stage,the girder and pylon of the long-span cable-stayed bridge have high compressive force,so the whole stability of the bridge should be considered.In this thesis,it takes an asymmetric tend on disposition cable-stayed bride as an example to analyze the stability of long-span cable-stayed bridge by the general finite element software. First,it introduce the stability analysis methods of cable-stayed bridge. And then special stages are analyzed.Long span cable-stayed bridge is one of the most important modem bridge types,including the asymmetric tend on disposition cable-stayed bride.In fact,considering the geological condition,terrain condition and hydrological condition,most projects use the bilateral asymmetry.As a result of increasing bridge span,deck flexibility and structure complexity, earthquake analysis of long span cable-stayed bridge is essential.So,except stability analysis,it also introduces structure dynamic analysis,which mainly studies on eigenvalue buckling analysis, response spectrum analysis and analysis.Througth the static stability analysis and dynamic analysis of this bilateral asymmetry,it accomplishes most of the analysis of the constrcture and reach the research goal in this thesis. |
