Displacement-Based Seismic Design of a Large Naval Pier

摘要

This paper discusses the displacement-based seismic design of the newest naval pier at Naval Station Bremerton in Bremerton, Washington. It is 45.72 meters wide by 399.3 meters long and is capable of simultaneously berthing two aircraft carriers. Displacement-based design is the state-of-the-art in seismic design and its basic premise is to determine what displacement will occur during the design earthquake and detail the structure to accommodate its displacement. This is a significant change from most current codes, which are force based. The project enjoyed a 50 percent reduction in piling by using the displacement-based when compared to the force-based method. rn Soil-structure interaction, push-over analysis, material overstrengths, and site-specific response spectra are used to determine the displacement response of the pier under Levels 1 and 2 earthquakes, the “displacement demand.” A push-over analysis is then performed to the displacement demand and the expected capacity of individual members and connections are evaluated and compared to the displacement demand on each member and connection.