Study On Economy Assessment For Bridge Strenghtening

With the development of the communication, the imminency problem the reconstruction to lots of bridges. In the face of the instance of the lack of bankroll, how important the objective, scientific, rational to analyse the strengthening.This paper mainly put forward the economical estimate research aim at the service bridge in the construction and maintain. How to choose between the strengthening and rebuild, how to choose the best opportunity in the strengthening, how to choose the greatest strengthening method, how to upper-estimate the techo-economy in the bridge strengthening and so on. Expounding the relative theories, applying in the actual bridge strengthening , analyzing the bridge economic situation so as to ensure the best value and cost in the whole life-span cycle .First of all, take stone arch bridge as a type. Classify and measure the abrasion block , adopt the principle of benefit-cost radio , choose the project between rebuild and strengthening; Secondly, perfect whole life-span theory, optimize the project with dynamic and static methods , calculate the decision benefit maximize and cost minimize ; Thirdly choose the best strengthening opportunity adopt the following methods: base on the running quality exponential criterion, base on the use performance advance estimate and base on the least annual cost ; At the same time, illustrate five strengthening methods , adopt Blurry Analytical Hierarchy Pross combining with practice to choose the most appropriate strengthening method ;Lastly, estimate practicality effectiveness after strengthening from the following aspects: technology effectiveness, economy effectiveness, society and environment effectiveness and continuable effectiveness.This paper creationaryly bring engineering economy principle to bridge strengthening technique and establish economy model combining with practical strengthening engineer. On the one hand , make sure the anticipate investment goal achieve or not ;On the other hand , summarize the strengthening project experience to affect later strengthening project about research, design, construction and management. The research of the paper is possible to assist strengthening theoty develop to theorization, systematism and standardization.