Seismic Fragility Study of Fire Sprinkler Piping Systems with Grooved Fit Joints
Publication: Journal of Structural Engineering
Volume 141, Issue 6
Abstract
A comprehensive analytical model is developed for a pressurized fire sprinkler piping system of a hospital building. A suite of ninety-six artificial triaxial floor acceleration histories is used to generate seismic fragility parameters of the sprinkler piping system. The analytical model accounts for the inelastic behavior of braces, hangers, and wire restrainers. It incorporates an experimentally validated hysteresis model developed, as part of this study, for the moment-rotation relationship of grooved fitted joints. Component fragility parameters were obtained for lateral restrainers, hangers, and pipe joints. Three system-level damage states were defined based on the level of functionality of fire sprinkler systems and severity of leakage after a seismic event and a joint probabilistic model were utilized to obtain system-level fragility parameters. Finally, the seismic fragility of fire sprinkler systems with grooved fit joints is compared to that of a piping system with threaded joints.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. 0721399. This GC project to study the seismic response of nonstructural systems is under the direction of M. Maragakis from the University of Nevada, Reno and Co-PIs: T. Hutchinson (UCSD), A. Filiatrault (UB), S. French (G. Tech), and B. Reitherman (CUREE). Any opinions, findings, conclusions, or recommendations expressed in this document are those of the investigators and do not necessarily reflect the views of the sponsors. The input provided by the Practice Committee of the NEES Nonstructural Project, composed of W. Holmes (Chair), D. Allen, D. Alvarez, and R. Fleming; by the Advisory Board, composed of R. Bachman (Chair), S. Eder, R. Kirchner, E. Miranda, W. Petak, S. Rose, and C. Tokas, has been crucial for the completion of this research. The authors are especially grateful to A. Gupta for providing the piping plan.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 141 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 29, 2013
Accepted: May 30, 2014
Published online: Jul 28, 2014
Discussion open until: Dec 28, 2014
Published in print: Jun 1, 2015
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