Based on the life-cycle cost analysis theory of bridges,the cost characteristics of long lasting weathering steel bridges at different stages were systematically summarized,and the contents and characteristic parameters of the life-cycle economic evaluation of long lasting weathering steel bridges were clarified.Also,the basic assumptions for cost calculation of long lasting weathering steel bridges were provided.Two cost calculation methods at construction and operation stages were analyzed by comparing the cost difference between uncoated weathering steel bridges and coated steel bridges,and a life-cycle economic evaluation model of long lasting weathering steel bridges was established.Three long lasting uncoated weathering steel composite bridges in China were taken as examples to calculate the life-cycle cost of bridges at each stage.The economic parametric influence of coating and maintenance methods on the life-cycle cost of long lasting weathering steel bridges was clarified,and the economic advantage of the life-cycle cost of long lasting uncoated weathering steel bridges was analyzed.Research results show that the cost difference between uncoated weathering steel bridges and coated steel bridges mainly lies in the prices of steel and welding materials,patina detection cost,coating maintenance cost,and resulting environmental and user cost.Compared with four coated steel bridges,the cost of uncoated weathering steel bridges reduces by 11％-21％in the life-cycle,and they have significant economic advantages throughout the life-cycle.Washing cycle has a significant influence on cost that increases by 5％-11％throughout the life-cycle when the cycle changes from once every six years to once every year.When the coating area of uncoated weathering steel bridges reaches about 70％,their life-cycle costs are greater than that of coated steel bridges.The life-cycle economic evaluation model of long lasting weathering steel bridges can provide a basis for bridge scheme design and analysis of techno-economic cost performance,which will promote the promotion and application of long lasting weathering steel bridges.3 tabs,9 figs,30 refs.
NETL
NSTL
万方数据
