System reliability-based criteria for the design of steel storage rack frames by advanced analysis: Part I – Statistical characterisation of system strength

Abstract

This paper concerns the underpinning system reliability calibrations that will enable the implementation of the next generation of system-based design-by-analysis method of steel rack frames, i.e., a design approach where analysis and capacity checks are carried out in a single step by using fully nonlinear analysis. The paper details the design framework of the new approach, referred to as the Direct Design Method (DDM), and derives system strength statistics for five typical configurations of rack frames using Monte-Carlo simulations, taking into account the randomness of geometric and material properties. The nominal models of rack frames are developed in accordance with the Australian Standard AS4084. The mean-to-nominal ratios (bias) and coefficient of variation of the system strengths are obtained, and will be used in the companion paper to derive the system resistance factors consistent with a given structural reliability.