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Abstract
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Sponsored by the Task Committee on Lift-Slab Construction of the Technical Council on Forensic Engineering of ASCE.
In 1987, the collapse of Ambiance Plaza in Bridgeport, Connecticut, demonstrated the need to re-evaluate the engineering of lift-slab construction and determine what is needed to make it safe. This report addresses engineering requirements for lift-slab construction and presents recommendations to engineers, architects, and lift-slab contractors for its safe use.
Topics include: concepts and details of various lift-slab systems; theories on the cause of the Ambiance Plaza collapse; discussions on other failures and problems; considerations and recommendations for lifting collars and lifting equipment; considerations and recommendations for stability; recommendations for construction loads; discussions and recommendations for preventing progressive collapse; and considerations for planning and execution of lift-slab projects.