Consecutive Earthquakes Evaluation of Berths 100-102 at the Port of Los Angeles

Port of Los Angeles (POLA) berths 100-102, consisting of 2,500 foot-long (762 m) concrete container wharves, were constructed in three phases over a 10-year period. This paper discusses the seismic analysis and evaluation of post-seismic conditions for these wharf structures, which included three levels of ground motion with corresponding performance criteria, and identified vulnerabilities based on the expected structural response for a typical wharf section. Single and multiple consecutive discrete earthquake events were analyzed. No established methods exist to determine displacement demand due to consecutive discrete earthquake events, defined as an event that occurs after the first event allowing sufficient time for the structure to unload and reach a rest position. In this paper, two methods were proposed to determine these displacement demands, the algebraic addition and residual methods, were analyzed. Additionally, repair methods were proposed and analyzed for single and consecutive post-seismic events to verify/confirm the performance of the proposed repair method.