Seismic Isolation System for a Floating Dry Dockby James M. Keith, URS-John A. Blume & Associates, San Francisco, CA, USA,
Leo P. Conoscente, URS-John A. Blume & Associates, San Francisco, CA, USA,
Terry Harvey, URS-John A. Blume & Associates, San Francisco, CA, USA,
Abstract: The seismic isolation system consists of two dolphins, each a relatively large-diameter cantilevered steel pipe pile anchored in Franciscan rock, and buffered connections to the floating dry dock. The buffered connections use flexible shear sandwich panels to provide an additional 2 feet of elastic horizontal displacement between the collar around each dolphin and the support bracket integral with the floating dry dock. The resulting fundamental period for horizontal motion of the system is appreciably lengthened by this arrangement. This net result is that high ground accelerations are not transmitted to the dry dock and the increased elastic displacements result in a mooring unlikely to fail during a major earthquake.
Subject Headings: Shipyards | Seismic tests | Base isolation | Connections (structural) | Steel structures | Seismic effects | Offshore structures | Steel piles
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