Study On Parameter Of Using Section Enlargement Method Reinforce Of Existing Reinforced Concrete Double Arch Bridge

Double arch bridge as a kind of special bridge in our country,have been built in largequantities,especially many double arch bridges in early time have been led a great deal ofvarying degree plant disease.However,if make all of its demolition and reconstruction, isobviously not economical. Therefore, for these are still in service bridges to maintenance, toimprove the bearing capacity and durability,has become the urgent need to solve the problem.Section enlargement method, as one of the many double arch bridge reinforcementmethod, because of its simple construction technology, reinforcement effect obviously, widerange of applications and so on, therefore is widely applied in the reinforcement of double archbridge main arch ring. At first, this dissereation based on the existing data collection andcollation,introduced the origin,development,construction and structure features of double archbridge,and elaborated our country on the development and research status of double archbridge reinforcement;Secondly,based on the available data and engineering examples, thedissertation summarized both the typical disease types and reasons of double arch bridge andcommon reinforcement methods, and focused on section enlargement method, studied anddiscussed the theory and calculation method of section enlargement method, gave thereinforcement design principle and working conditions of using section enlargement methodreinforced the double arch bridge;Finally, combining with a project example, and using thebridge finite element analysis software Midas/civile, established the bridge space finite elementmodel,and strengthened this bridge with different thickness,location and scope, calculated thedouble arch bridge the section internal force stress and deflection.On this basis,this dissertationanalysed the results before and after reinforcement comparatively,and studied the influence ofthe parameters on strengthening effect.Reinforcement thickness, location and scope are two important aspects used to strengththe double arch bridge.Analysing and studying their seneitivity to the double arch bridgereinforcement effect can understand its effect on the reinforcement effect more directly,andraise the scientific nature of using the section enlargement method to reinforce double archbridge,which has realistic effect on adopting subsequently this method to reinforce the similarproiects.