The Calculation And Analysis Of Large-Span Cable-stayed Bridge

The cable-stayed bridge is a composite bridge composed of cables,girder,tower three basic bearing structure which belongs to the spatial stress characteristic of an indeterminate structure with high degrees.In order to make the stress and deformation of cable-stayed bridge being in reasonable range in the whole construction process and operation stage,it establishes a calculation model of the precise,calculates stress and deformation in each construction stage and operation stage and gets the change rules to make construction control more convenient.Based on the engineering design of the main bridge of Shui Yang Jiang Bridge,this article performed the bridge structural analyses during the periods of construction,in-place and operation via the commercial finite element analysis software Midas/Civil.The analyses reported cable stresses and the deformation in the pre-stressed main girder,which gives a favorable structural in-place state.The critical step for the simulation of construction analyses for cable-stayed bridge is to identify suitable finished state.By precise modelling of the bridge main girder,tower and cable,it could accurately predict the internal forces and stresses in the cables and girders as well as the deflections during each construction period.The sensitivity analyses were also performed to investigate the influence of the potential error on the in-place state,which will provide a guidance for the design,construction and monitor.