American Society of Civil Engineers

Attaching Tower Cranes to Buildings in New York City

by Dan Eschenasy, P.E., M.ASCE, (Chief, Structural Engineer, New York City Buildings Department. E-mail:
Section: Forensics, pp. 1561-1569, (doi:

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Document type: Conference Proceeding Paper
Part of: Structures Congress 2011
Abstract: The paper presents an overview of the issues related to the application of tower crane loads to buildings under construction. Intended for the structural engineers who design these buildings, it provides a primer on the derivation of these loads by the crane installation designers. Based on a review of tower cranes installations designs executed in New York City, the author finds that the attachments at the top of the structure can develop horizontal loads of same order of magnitude as the wind loads used for the base building design. Interaction and responsibility between crane and building engineers is examined. The building designers are better suited to evaluate the effects on the main lateral load resisting system. The crane installation designers need to use more consistency and clarity when presenting the loads for evaluation by the engineers of record.

ASCE Subject Headings:
New York City
New York