Non-Linear Analysis and Redundancy Approach for Analysing Offshore Steel Structures During Ship Impact

摘要

This paper outlines the general approach to analyse fixed offshore steel platforms for accidental ship impact. The objective is not to design the platform to resist the ship impact but rather to absorb the impact energy. The approach is to utilise non-linear behaviour of the steel materials and system redundancy of the structures in assessing the platform integrity. A series of plastic hinges and member damages are allowed during the impact, however there should be no danger of platform collapsing. The structure should be able to withstand a specified weather window so that the damage members could be repaired if necessary within a reasonable time.