Service Stone Arch Bridge Reinforcement Technology

Stone arch bridge with the advantages of drawing materials conveniently, low engineering cost, beautiful shape and so on, gets extensive application in our country, especially in hunan province. At present, because of low building standard, transport operation continually increased, or construction poor and so many other reasons, a large part of stone arch bridges appear the shortage in load capacity. Besides, it is dangerous to bridge that the basis emerges inhomogeneous subsidence because of the reasons that the basis isn't at the bedrock , or the basement is scoured by erosion. However, it is not only capital outlay but also consuming time and continuous traffic loads to remove them which are in a hidden danger. Hence, it is an urgent task for our bridge workers to reinforce and repair the service stone arch bridges.This article's main contents of study on stone arch bridge strengthening are as follows:Firstly, study common methods and theoretical calculation of stone arch bridge strengthening, obtain light moldboard rib stone arch bridge strengthening analysis theory, which provides theory basis how to realize flat hinged arch in ANSYS structural analysis.Secondly, by means of study on stone arch bridge reliability evaluation, obtain main and secondary clearly demarcated reliability synthetic evaluation method considering various factors in order to provide better reliable basis for optimization of strengthening schemes.Thirdly, establish optimization of the service stone arch bridge strengthening schemes evaluation index system, determine and process the evaluate quantitative index and qualitative index by fuzzy comprehensive evaluation principle, determine weight set, establish optimization of the service stone arch bridge strengt- hening schemes decision model, obtain optimal strengthening strategy considering comprehensive evaluation index. In the basis of which make consolidation calculation, and then establish finite element structure, verify strengthening design according to the calculation results.Fourthly, take for zhangjiajie xianrenxi bridge example, by means of study on stone arch bridge reliability evaluation, combine with finite element structural analysis and optimization of the service stone arch bridge strengthening schemes analysis, obtain reasonable, effective and feasible strength -ening method.This thesis focuses on the engineering example's analysis, through introducing and comparing with stone arch bridge strengthening method, and reliability evaluation analysis, by means of fuzzy comprehensive evaluation, determine optimization of strengthening schemes evaluation index system, the evaluate quantitative index and qualitative index and weight set, establish optimization of the service stone arch bridge strengt- hening schemes decision model, and combine with finite element structural analysis result, set mathematical statistics, fuzzy evaluation, numerical analysis, and others to one system , obtain optimal strengthening strategy considering comprehensive, which makes stone arch bridge strengthening more standard, informational, scientific.