Improved reliability determination when testing cold-formed steel components

摘要

The objectives of this paper are to (a) determine the sensitivity of the reliability calculations in Chapter F of the AISI Specification (AIS1-S100-07) to controlling load combinations and loading ratios, and (b) develop a more robust alternative for the use of Chapter F. To complete this study the bias factors and variances for all loading conditions are established. In addition, a range of practical load ratios is agreed upon. Parametric studies are performed to explore load case and load ratio dependency for use in the determination of the resistance factor, φ; specifically, the pre-factor term Cφ and the load variance term Vq. The parametric studies are simplified into a table that provides load case dependent Cφ and Vq factors. The table is recommended for use in Chapter F reliability analysis of new products.