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- W804763247 abstract "The reliability index is examined for steel girder highway bridges designed by AASHTO Load and Resistance Factor Design (LRFD) Strength I limit state for flexure and shear. The reliability analysis is based on the extensive stochastic finite element method (SFEM). The SFEM takes advantage of the conventional advanced first-order second-moment (AFOSM) in that it considers the mechanical connection between the critical member and other members in the whole structure. Simply supported multigirder steel bridges with span length of 30 ft to 120 ft and girder spacing of 4 ft to 12 ft are designed. The bridges are modeled as grillage beam systems. The sectional and material properties as well as dead and live loads are treated as basic design variables. The results obtained in this study indicate that the reliability index is very sensitive to the lateral distribution of live loads such as HS20 truck loading. Consequently, a simplified reliability analysis method for multigirder bridges can be used in the analysis. This simplified method can avoid the complex computation in SFEM yet achieve good accuracy. Based on this study, the AASHTO LRFD specification for Strength I limit state for flexure is a conservative design of steel girder bridges. However, the design based on Strength I limit state for shear achieves the target safety level." @default.
- W804763247 created "2016-06-24" @default.
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- W804763247 date "2002-03-01" @default.
- W804763247 modified "2023-09-27" @default.
- W804763247 title "RELIABILITY VALIDATION OF HIGHWAY BRIDGES DESIGNED BY LRFD" @default.
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