Abstract
In 1978 an out-of-control ship hit and severely damaged a bascule bridge across the Duwamish West Waterway in Seattle seriously affecting both ship and highway traffic. The high level West Seattle Bridge was subsequently constructed to handle all through-highway traffic. A swing bridge was also designed to handle local traffic over the ship channel. The function of the pier protection system described in this paper is to protect the pivot piers and swing spans of this new bridge from damage by absorbing the part of the tranverse energy component imparted by a colliding ship, which is not absorbed by deformation of the ship's hull.
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