传统钢与耐候钢桥生命周期成本对比分析

Comparative Analysis of Life Cycle Costs between Traditional Steel and Weathering Steel Bridges

钢结构桥梁由于刚度高、重量轻、建设周期短及碳排放量低等优点,已在桥梁建设中广泛应用。但传统钢结构桥梁由于钢材腐蚀,需定期养护维修,导致生命周期成本增加。本文以景中高速机场连接线主匝道高架桥为例,在综合考虑日平均车流量年增长率及资金时间价值等因素的基础上利用Monte Carlo分别对其使用传统钢和ASTM A1010钢建造时生命周期成本现值进行仿真模拟分析。研究表明,传统钢结构桥梁生命周期成本现值受日平均车流量年增长率及资金时间价值的影响较大,而ASTM A1010钢结构桥梁生命周期成本现值则影响较小,且ASTM A1010钢结构桥梁生命周期成本现值低于传统钢结构桥梁。本文研究结论可为该类桥梁的投资决策提供参考。

Steel structure bridges have been widely used in bridge construction due to their high stiffness,light weight,short construction period,and low carbon emissions.However,traditional steel structure bridges require regular maintenance and upkeep due to steel corrosion,resulting in increased lifecycle costs.This article takes the main ramp viaduct of the Jingzhong Expressway Airport Connection Line as an example,and uses Monte Carlo simulation analysis to analyze the present value of life cycle costs when constructed using traditional steel and ASTM A1010 steel,taking into account factors such as the annual growth rate of daily average traffic flow and the time value of money.Research has shown that the present value of life cycle cost of traditional steel structure bridges is greatly affected by the annual growth rate of daily average traffic flow and the time value of funds,while the present value of life cycle cost of ASTM A1010 steel structure bridges is less affected,and the present value of life cycle cost of ASTM A1010 steel structure bridges is lower than that of traditional steel structure bridges.The research conclusion of this article can provide reference for investment decisions of this type of bridge.