Study On The Cable Forces Optimization Of Long-span Cable-stayed Bridge With S-shaped Cable-stayed Footbridge On The Construction Stage

The construction force of cable-stayed bridge is a vital link in the design ofcable-stayed bridge,the situation of construction force is not just related to theconstruction safety,also play a decisive role to bridge,although part of the deviationcan be corrected through the2nd tension,but the thing of determining the constructionforce of cable-stayed bridge is also a very important work.With the development of cable-stayed bridge,the span of cable-stayed bridge islonger and longer,the style varies more and more,along with this developmenttrend,constantly innovative cable-stayed bridge come to the fore.This article made aspecific study on cable-stayed bridge with a S-shaped footbridge in the MianYangcity,how optimizes this new type of cable-stayed bridge.This paper uses the spatialdisplacement as control parameters and focuses on the following aspects:(1) Make a proof on the desirability of spatial displacement offootbridge,because footbridge has three aspects of spatial displacement,not alldirection can be controlled to optimize the construction force,this article uses reversemethod in theory to make a proof on the relationship among the desirability ofdisplacement、the bridge state and reasonable construction force.(2) The space direction of footbridge which can be used is used in dress analysisas control parameters,adding the construction cable force which is obtained by thezero displacement method and the rigid support for beam method,then compare andget the optimized cable force of the footbridge.(3) Adopting the same three kinds of methods for construction of cable force toanalys vehicular bridge,then obtained the better construction force.(4) Verified the impact of the footbridge which is in the construction project ofvehicular bridge,and compare the state of footbridge.(5) When the footbridge in the full-bracket construction,it uses six differentconditions to the comparative analysis of the construction force,obtained theoptimized cable force in the situation.Study shows that optimize the construction force of these special cable-stayedbridge with when use spatial displacement as parameters can get better constructionforce.Through the study of construction cable force of this type of cable-stayed bridge in this paper,it want to be able to achieve the purpose of optimizing construction forcethat result in a more satisfactory bridge,also hopes that can provide references to theconstruction forces of similar cable-stayed bridge.