Analytical and Experimental Evaluation of Progressive Collapse Resistance of a Flat-Slab Posttensioned Parking Garage
Publication: Journal of Structural Engineering
Volume 141, Issue 11
Abstract
Despite the popularity of posttensioned (PT) floors for parking garages and the likelihood of a column loss, due to blast or vehicle impact, there is a lack of research on the progressive collapse potential of this structural system subsequent to initial damage. In this paper, progressive collapse resistance of an actual posttensioned parking garage is evaluated experimentally and analytically. An interior column was removed by explosion and the structure resisted progressive collapse with a permanent maximum vertical displacement of about 61 mm (2.4 in.). Analytical models of the garage are developed using computer software and nonlinear dynamic analyses are performed. The interaction between the tendon and the slab is modeled explicitly. The analytical results show that despite the fact that the slab around the removed column had no bottom reinforcement and the tendons were placed close to the top of the slab, pushing the slab down, the compressive membrane forces developed in the slab helped increase the flexural strength of the slab sections. The gravity load redistribution is discussed and characterized.
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Acknowledgments
This paper is based upon research supported by the National Science Foundation (NSF) Award No. CMMI-0547503. The help provided by Dr. Marlon Bazan, Dr. Serkan Sagiroglu, and Scott Forest in the research reported in this paper is acknowledged. The reviews and valuable comments made by Dr. Mohammad Jonaidi, Justin Murray, and Dr. Serkan Sagiroglu are acknowledged and appreciated. The writers greatly appreciate the support provided by James Redyke (Dykon Explosive Demolition Corporation), without the help of whom the research reported in this paper would not have been possible to complete. The help provided by Leonard Cherry (Cherry Demolition), site manager Michael Dokell, and assistant Jaime Castaneda is also appreciated.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 11, 2014
Accepted: Jan 7, 2015
Published online: Feb 20, 2015
Discussion open until: Jul 20, 2015
Published in print: Nov 1, 2015
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