The Study Of Economic Evaluation On The Old Bridge Reinforcement

With the time going, any new bridge will be turned old. At present, it is very strenuous to maintain or reinforce the old bridge ,and it spends enormously on domestic and international. But there are less concerns on economic evaluation to the reinforcement of old bridges. Generally speaking, the bridge reinforcement cost very less at the construction, the investment is "economy ". This paper does some discussions to the economic evaluation on the old bridge reinforcement.Economic evaluation needs cost and benefit. So does the old bridge reinforcement.In the discussion of the cost, it is expansion from the disposable input at construction to the whole life cycle cost, from detection, design and operation, to Invalid through the Life Cycle Cost (LCC). Meanwhile, the old bridge reinforcement project social cost and environmental cost in life cycle are considered.In the discussion of benefit, the direct economic benefits and indirect economic benefits of old bridge reinforcement project are introduced systematically. The reinforced old bridge service state and degradation rate is not as same as the new bridge. Through based on structural reliability bridge model, we can calculate the expected value of economic benefits, and use the structure resists the decay speed of strength to describe the degradation rate of the bridge. The economic benefits difference of the old bridge and new bridge is reflection. Meanwhile, the old bridge reinforcement project social benefit and environmental benefit have been described briefly."Cost-Benefit Analyses " is a general evaluation method in public basic project investment. With economic development and social progress, the investment evaluation has transited evaluation system made up from single economic evaluation by economic evaluation, social evaluation and environmental impact evaluation. The social cost-effective of the project, the environmental cost-effective is difficult to measure, these two items evaluations are determined in the nature description stage at present. According to old bridge reinforcement character, this paper sets up second...