Authors
Richard J Bathurst, Sina Javankhoshdel, Tony M Allen
Publication date
2017/9/1
Journal
Journal of geotechnical and geoenvironmental engineering
Volume
143
Issue
9
Pages
04017053
Publisher
American Society of Civil Engineers
Description
A general closed-form solution for the reliability index (or probability of failure) of a simple linear limit-state design function with one load term and one resistance term is used to compute the resistance factor expressed in a load and resistance factor design (LRFD) format. The solution considers method bias, bias dependencies, and uncertainties in choice of nominal values of load and resistance determined as part of the project-specific design process. Uncertainty in the choice of nominal values for design is linked quantitatively to the concept of project level of understanding that has been recently adopted in Canadian design practice. All random variables are assumed to be lognormally distributed. Parametric analyses are carried out to show that ignoring possible correlations between random variables can lead to conservative (safe) values of resistance factor and in other cases to nonconservative (unsafe …
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