A Reliability-Based Approach to Determine Local Ice Design Pressures

摘要

Design values of local ice pressure may govern the member sizing of an arctic structure that is subject to ice actions. Although the local pressure-area relationships are provided in some design codes (e.g. ISO 19906:2012), questions remain on how to apply such a relationship to a structural design process, which often utilizes finite element method. In this paper, a structural reliability-based approach is proposed to define the design local pressure distributions associated with the structural members under design. The local pressures are treated as random processes with pre-defined correlation functions. These random processes are transferred to a new set of independent processes to enable the Monte Carlo simulations (MCS). The First-Order Reliability Method (FORM) and Second-Order Reliability Method (SORM) can then be applied to define the design pressure distributions. Finally, this new approach is illustrated in an example using beam finite element.