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Fragility Analysis Methods for Steel Storage Tanks in Seismic Prone Areas

[+] Author Affiliations
Hoang Nam Phan, Fabrizio Paolacci, Silvia Alessandri

Roma Tre University, Rome, Italy

Paper No. PVP2016-63102, pp. V008T08A023; 9 pages
doi:10.1115/PVP2016-63102
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5046-6
  • Copyright © 2016 by ASME

abstract

Catastrophic failure of above ground storage tanks was observed due to past earthquakes causing serious economic and environmental consequences. Therefore, the evaluation of the seismic vulnerability of existing liquid storage tanks located in seismic prone areas is an important task. Seismic fragility functions are useful tools in order to quantify the seismic vulnerability of structures. These functions give a probability that a seismic demand on a structural component meets or exceeds its capacity, and are generally derived by a variety of approaches, e.g., field observations of damage, static structural analyses, judgment, or analytical fragility functions. Unlike the other methods, the analytical fragility functions are developed from a coupling of the structural response analysis and a probabilistic seismic demand model. The objective of this study is to investigate the seismic vulnerability of above ground steel storage tanks using different analytical methods of the fragility function. A comparison of the well-known cloud method and the incremental dynamic analysis is performed at different limit states for two existing cylindrical steel storage tanks. The first tank represents a slender geometry with a fixed-roof and the second one is a broad tank, unanchored, and provided with a floating roof.

Copyright © 2016 by ASME
Topics: Steel , Storage tanks

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