Probabilistic Seismic Safety Evaluation of Precode Cylindrical Oil Tanks
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 6
Abstract
Cylindrical steel liquid storage tanks are important components of many process industries. They are usually used to store toxic, flammable, and hazardous liquids. Hence damage to liquid storage tanks may cause serious direct and indirect impacts. Many of the existing tanks in old industrial plants are precode tanks or were designed based on early editions of seismic codes. Meanwhile, the performance of old liquid storage tanks during the past earthquake revealed that they are noticeably vulnerable. In this paper, analytical and empirical probabilistic seismic safety analysis (PSSA) of precode tanks were performed. Fragility curves were developed in terms of the height-to-diameter ratio () and the relative amount of stored liquid (% full). To this end, 750 tank-liquid-earthquake analysis cases have been performed. Furthermore, performances of 43 unanchored old liquid storage tanks during three major earthquakes were observed. Results of this study revealed that the can be considered the most important source of uncertainty in PSSA of precode tanks. Moreover, the variation of % full causes shows noticeable changes in the values of fragilities of tanks.
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Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 6 • December 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 21, 2014
Accepted: Jul 29, 2014
Published online: Sep 26, 2014
Discussion open until: Feb 26, 2015
Published in print: Dec 1, 2015
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