Load Influence On Ultimate Load-carrying Capacity Of CFST Arch Bridge With Long-span

The span of the concrete-flled steel-tube arch bridge is more and more long, and the problem of its stability is more and more important,which is one of decisive factors in designing process of arch bridge.Then the research of the stability and ultimate bearing capacity of concrete-filled steel-tube arch bridge have great engineering value and theory significance.In this paper,the research results of domestic and overseas scholars on stability and ultimate bearing capacity of concrete-filled steel-tube arch bridge are roundly summarized first.Then the base way of CFST arch bridge' s stability and ultimate bearing capacity analysis are elaborated.The study based on the project of WuXia bridge in SiChuang,analyzed ultimate bearing capacity of sixteen cases after construction by the finite element analysis of ANSYS software. The main works are as follows:1.Through calculation and analysis, the change rule of internal force of CFST arch bridge is investigated.2.The coeffient of stability,failure route, failure mechanism and collapse shape of different state are discussed in detail.Some important conclusions are given,which are useful for reference to the readers who engage in bridge design of such kind.3.Live load ration has some effect on CFST arch bridge's ultimate bearing capacity coeffient,and the fitting formula is given for the relationship between them.4. According to criterion,a implified method of utility for calculating ultimate bearing capacity of CFST arch bridge with truss section is presented .The results are compared with finite element method.It is proved to be safe. Ultimate bearing capacity of CFST arch bridge with truss section can be evaluated through the method.