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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.

Concrete construction. --- Concrete slabs. --- Slabs --- Concrete construction --- Construction engineering --- Forensic engineering --- Construction equipment --- Failure loads --- Urban areas --- Infrastructure construction --- Connecticut --- United States