Analysis Of The Stability Of Concrete-filled Steel Tube Arch Bridge In Construction Procedure

In recent years, as a bridge type used concrete filled steel tube,concrete arch bridge with stiff skeleton (SRC) has received a rapid development for it's advantages and closing to the actual conditions of bridge construction in our country. As one part of bearing of completed bridge, and also stent of arch bridge moulding, stiff skeleton is more and more flexible with increasing of the span, therefore, constructing stability is one of the the key factors that constrains its development.Based on study and summarization of the calculation results of the same bidge type in our country, this dissertation establish 3-D finite element model of one deck type concrete single span concrete arch bridge of box girder with stiff skeleton with software ANSYS and get the solution.It calculate how many arch ribs can be hoisted and closed when it meets the requirements of constructing stability and benefit to construction work,find the construction stage which goes against stability,and then it considers influences of geometric nonlinear factors on the most unfavorable step .Basing on the achievements of domestic and abroad research,and engineering practice, according to the stability of concrete arch bridge with stiff skeleton of large span, this dissertation analyze by using finite element calculating method. The results can provide theoretical guidance to design andconstruction of the similar bridge type.