Study On Select Of Strength Scheme Of Bridge In Service

In recent years, the construction of bridge is booming, and achieves a lot success.Bridges distributed in the city and rural are still bury the critical traffic. For various historyreasons, a great amount of bridges cannot satisfy the requirement of traffic capacity. It isimpossible to pull down them to new build them, whatever from the economic or from keepthe traffic moving, so it is necessary to strength or rebuild the bridges.First, the paper summarizes the general principles and methods used in bridgestrengthening, analyze the impact of bridge strengthening program selection factors and putforward the principles of bridge strengthening program selection. The advantages anddisadvantages of several common bridge strengthening methods are summarized and as theeconomic basis for comparison. Then, overall consideration the impacts of different methodsof strengthening for bridge strengthening program.and put forward the best available method.Level optimum Seeking Method build on the basic theory of Analytic Hierarchy Process.It impacts the factors of Reliability, economical, rationality, technical feasibility andconstruction convenience of bridge strengthening program, then subdivision those factors, andformation the Level2evaluation index system of bridge strengthening program, thendetermine the important of every factor for the strengthening target through the way ofweighting, and obtain the final conclusion. This method is simple, understandable, andconvenient operation.multi-objective decision method is improved based on the Level Optimum SeekingMethod which analyse factors from the angle of qualitative quantitative. And calculate therelative membership degree of factors, then select every program and obtain the finalconclusion.This paper take specific engineering project as an example for the analysis andcalculation, verify the Rationality and feasibility of each methods. Finally the paper gives amethod which Combine the Value engineering theory with bridge strengthening. It rised theissue of optimum seeking of bridge strengthening to optimum seeking of Scheme value. Thismethod provide us with new ideas and directions to solve those questions.