Seismic Vulnerability Assessments of Marine Structures Using Non-Linear Static Analysis Procedures

摘要

As part of maintenance and future planning for marine structures, a condition assessment and load rating are traditionally performed every 2 to 5 years, depending on the use and importance of the structure. Traditionally, the load rating of these structures only considers the "day-to-day" vertical service loading. As a greater understanding of the inherent, seismic hazards present in areas of the United States with marine infrastructure including those on the east and west coasts, vulnerability studies of existing structures are becoming more common. These studies estimate the expected behavior of the structure under a variety of loading conditions. This assessment helps determine if the facility needs to be repaired, given its current condition, or upgraded for changes in operational loading or use. This paper will demonstrate the implementation of non-linear static analysis techniques for assessing the vulnerability of existing marine infrastructure. In particular, the effects of concrete pile deterioration and concrete pile-to-pile cap connectivity on the service and lateral/seismic resistance of a typical pile supported marine structure is presented. The impact of considering the current condition state of the structure throughout the analysis will be emphasized.