Structural Analysis Of The Cable Stayed Assemble System Of Long-span Arch Bridge

This article introduced the ususal means of nonsupported construction technology of large-span arched bridge. Thoroughly discussed the jack cable inclined pulling and buckling methods.On the basis of the construction of Qiandao Lake Bridge in Hangzhou,it has an structure analysis of the jack cable inclined pulling and buckling system .The hoisting of the rib of the long-span arch bridge has the remarkable non-linear characteristic. Therefore, it needs to establish the buckle to hang the system the non-linear finite element analysis model of cable-stayed system in the FEM of structure . On the basis of the finite element analysis software-ansys this article had a calculation of cable-stayed system under different situation .Through comparison, it chosed the nonlinear method to establish the equations,the solution methods, the convergence criterions and the optimized analysis theories, and compiled the optimized procedure of cable element with the APDL language according to the stress characteristic of the cable-stayed system.This article separately analyses the cable and tower of installs systems in the long-span arch bridge and contrasted the main calculation methods of long-span arch bridge, chosed the positive analytic method to computate the cable-stayed systems of Qiandao Lake bridge. According to the actual situation, established the simplified computation model.lt has a calculation of cable under optimization, and use foreordain lifted elevation method, which can making the arch segments satisfy the reasonable arch axial after hoisting. Considering the effection of change of temperatural to the force of cable and the displacement of arch's node.In the construction of arch bridge ,it usually set reasonable cables in the top of tower to counteract the effection of wind in the analysis,ignoring the effection of the displacement of the tower to the hoisting of arch segments.The article has proved the way is reasonable , and finally checked the strength the distortion and stability of the Qiandao Lake bridge,and gived some advises to the design..This article studied whole character of the system which concluding the cable,tower and the arch segmens in the hoisting construction.Set up a model of the global system considereing the cooperation of cable and tower of the cable-stayed system and the temperature effection, have a structural analysis of global model.After comparing ,pointed out the merit and the demerit and the applicability of the separate model and the global model.