Performance of Urban Cofferdams Braced with Segmental Steel and Reinforced Concrete Ring Beams
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 4
Abstract
The performance of two urban cofferdams is presented in this paper. The first case history is a cofferdam built for the One Museum Park West structure (OMPW), braced with segmental steel ring beams. The second is a cofferdam braced with cast-in-place reinforced concrete ring beams. The main goal of this paper is to study the excavation-induced ground deformations arising from these two cofferdams built in similar geologic settings but different bracing systems, installation sequences, and material responses to time-dependent effects. The deformations at the OMPW cofferdam are attributed to the compliance in the overall retaining system caused by a large initial unsupported cantilever depth and gaps left open between segmental steel ring beams and sheet piles. For the cofferdam at Site 2, observed ground movements are attributed to a rapid construction sequence, low temperatures during concrete curing, and concrete material time-dependent behavior of the concrete ring beams.
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Acknowledgments
Financial support for this work was provided by the National Science Foundation Grant No. CMMI-1538506. The support of Dr. Richard Fragaszy, program director at the National Science Foundation, is greatly appreciated.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 14, 2017
Accepted: Oct 13, 2017
Published online: Feb 8, 2018
Published in print: Apr 1, 2018
Discussion open until: Jul 8, 2018
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