Research On Ultimate Bearing Capacity Of Concrete Filled Steel Tube Arch Bridge With Truss Section

Arch bridge because of advantagesof large capacity, high-capacity, high utilization of space, low cost and the aesthetic appearance, more and more people are in favor of constructions of arch bridges in recent years.wit the development of new technologies and the birth of high-strength materials, the Span are growing larger and larger. When long-span arch bridges are built ,the issues of geometric nonlinear takes more and more people's attention.Little work has been done to the research of the influnce of geometric nonlinear to the cerement pouing procedure. According to the research of the concrete-filled steel tube at present,the influence of geometric nonlinear was considered to analyze the inner force,the deflection and the stalibity of the construction procedure for concrete-filled steel Tube Arch Bridge. Numerical analysis methods are used to compare elastic and non-linear results in stability analysis. After comparing we found that the results of elastic stabilities are all small,and at the begaining of the procedure of pouring the cerement the impact of the geometric nonlinear.is larger The change of rigidity is the main factor in the analysis of the inner force with the impact of geometric nonlinear. By analyzing the impact of the change of the structural rigidity to the non-linear rate,we found that with the increase of I/(L3) the non-linear rate is exponentially decreased and begain to stabilize.At the begaining of the structual procedure, geometric nonlinear do more influence. After comparing results of elastics and geometric nonlinear,we found that results of elastic are all small.