The Structure Static And Dynamic Behavior Analysis Of The Concrete Self-anchored Suspension Footbridge

Because of many advantages,such as the beautiful sculpt good economic capability and the doughty adaptability to the landform and the geology,concrete self-anchored suspension bridge is favourable by more and more people.Based on the confirmation of many domestic projects , the scheme ,that concrete self-anchored suspension bridge is applied to the large-span footbridge ,is economic and beautiful.Based on the scheme of the concrete self-anchored suspension footbridge(22m+70+22m),the integrated and detailed finite element model of the whole bridge was built by Midas/Civil,to study and analyze some problems.Firstly,this paper caculated and analyzed the stress condition of the main cable hanger and the main beam in the finished bridge.Then,based on the reasonable finished bridge,to analyze the construction processes,the stress of the hangers and the main cables during every phase of the construction were gotten to study the static loads of the concrete self-anchored suspension finished footbridge.Through the force and the stress envelope under every loads combination,the calculation results were analyzed.And then,it was concluded that it satisfied the safty of the bridge design and the reasonability.The vibration of the footbridge is mainly produced by the invigorative function of the pedestrians is decided by the main functions of the footbridge , vice versa could influence the comfort of the pedestrians and even the normal walk.Such as the Millennium Bridge was closed because of the large vibration by the pedestrians in the open day.Finally,the autooscillation characteristics of the concrete self-anchored suspension footbridge was caculated , and the footbridge vibration under different human loads was caculated by time-history .To analyze the most unfavorable position in the middle of the midspan , based on the comfort standard of the annoyance rate , refer to the permissible value of the annoyance rate of the common building high-rise building and the offshore platform structure ,the author synthetically estimated the footbridge.And the dynamic behaviour of the footbridge maked well,and the pedestrians comfort were satisfied well.