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Life-Cycle Cost-Effective Optimum Design of Steel Bridges Considering Environmental Stressors  

Lee, Kwang Min (한양대학교 대학원)
Cho, Hyo Nam (한양대학교 토목환경공학과)
Cha, Cheol Jun (시설안전기술공단)
Publication Information
Journal of Korean Society of Steel Construction / v.17, no.2, 2005 , pp. 227-241 More about this Journal
Abstract
This paper presents a practical and realistic Life-Cycle Cost (LCC) optimum design methodology for steel bridges considering the long-term effect of environmental stressors such as corrosion and heavy truck traffics on bridge reliability. The LCC functions considered in the LCC optimization consist of initial cost, expected life-cycle maintenance cost, and expected life-cycle rehabilitation costs including repair/replacement costs, loss of contents or fatality and injury losses, road user costs, and indirect socio-economic losses. For the assessment of the life-cycle rehabilitation costs, the annual probability of failure, which depends upon the prior and updated load and resistance histories, should be accounted for. For the purpose, Nowak live load model and a modified corrosion propagation model, which takes into consideration corrosion initiation, corrosion rate, and repainting effect, are adopted in this study. The proposed methodology is applied to the LCC optimum design problem of an actual steel box girder bridge with 3 continuous spans (40m+50m+40m=130m). Various sensitivity analyses are performed to investigate the effects of various design parameters and conditions on the LCC-effectiveness. From the numerical investigation, it has been observed that local corrosion environments and the volume of truck traffic significantly influence the LCC-effective optimum design of steel bridges. Thus, these conditions should be considered as crucial parameters for the optimum LCC-effective design.
Keywords
Life-Cycle Cost; Indirect Cost Model; Steel Bridge; Optimization; Time-variant Reliability; Corrosion Model;
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