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Rating and Lifetime Prediction of a Bridge with Maintenance  

Seung-Ie Yang (Department of Civil and Environmental Engineering, University of Colorado)
Han-Jung Kim (School of Agricultural Biotechnology, Seoul National University)
Publication Information
Journal of the Korean Society of Safety / v.18, no.1, 2003 , pp. 108-115 More about this Journal
Abstract
Bridges are rated at two levels by either Load Factor Design (LFD) or Allowable Stress Design (ASD). The lower level rating is called Inventory Rating and the upper level rating is called Operating Rating. To maintain bridges effectively, there is an urgent need to assess actual bridge loading carrying capacity and to predict their remaining life from a system reliability viewpoint. The lifetime functions are introduced and explained to predict the time-dependent failure probability. The bridge studied in this paper was built 30 years ago in rural area. For this bridge, the load test and rehabilitation were conducted. The time-dependent system failure probability is predicted with or without rehabilitation. As a case study, an optional rehabilitation is suggested, and fir this rehabilitation, load rating is computed and the time-dependent system failure probability is predicted. Based on rehabilitation costs and extended service lifes, the optimal rehabilitation is suggested.
Keywords
bridges; bridge rating; system reliability; remaining life; lifetime function; optimal maintenance;
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  • Reference
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