Dumbbell CFST Tied Arch Bridge Construction Optimization And Stress Analysis

In recent years,steel tube concrete arch bridges have been put into widely use due to their delicate appearance,convenient construction,and good mechanical performance,etc.This paper was composed with the engineering background of Guxu high-speed screw walled bearing type tied arch bridge.The construction methods of of CFST arch bridge have been contractively analyzed on aspects of technique difficulty and economic indexes.Also,there is constrictive analysis that is based on the stress state of finite element program for different structure.The main content and the conclusion are summarized as follows:1.The characteristics of concrete filled steel tube,and the development of concrete filled steel tubular arch bridge and the research status quo of the research are introduced.In order to introduce the construction method of the steel tube concrete arch bridge,the construction method of the steel pipe concrete arch bridge is briefly introduced.2.Through the finite element software Midas/Fea establish local entity model of arch rib,MIDAS/civil arch rib bar system model is established,considering the construction stage of the whole bridge model,the stress of steel tube section,concrete in pipe stress has arch rib stability analysis to determine the concrete in the tube of the pump send order,finally draws the conclusion:first perfusion bottom chord tube for the optimal construction method,in the middle decorated plate is not concrete but also to ensure the construction period and the operation safety.3.Based on the Saint Venant's principle using finite element software MIDAS/FEA establish arch foot local model,the shaft system model of the rod internal force in accordance with the principle of equivalent static imposed on the arch foot local model of arch rib end section.By analyzing the local stress of the arch foot in different stages of construction,it can provide some reference for further study of this kind of structure.