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Risk-targeted seismic design of the freeboard for steel storage tanks equipped with floating roofs

  • S.I. : Natech Risk Assessment of Hazardous Facilities
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Abstract

The loss of containment due to seismically induced liquid overtopping tanks with floating roofs was addressed by introducing a risk-targeted freeboard seismic design. The proposed practice-oriented procedure can be applied to new or existing tanks for which the freeboard was designed based on the tank wall height or liquid height, respectively. It combines the conventional seismic risk equation, and the code-based equation for the maximum vertical liquid displacement at the tank wall corresponding to the seismic action. The inconsistency in the intensity measures used in the two equations was solved by a carefully estimated mean acceleration spectrum that was used to convert spectral accelerations at different periods. The proposed design approach was verified in two numerical examples based on the previously assessed seismic risk for a given freeboard of a broad liquid storage tank located in Italy. Parametric studies were conducted to obtain insights into the sensitivity of risk-targeted freeboards to the design input parameters. It was realised that the assumed standard deviation of the logarithmic values of the spectral accelerations causing the loss of containment did not significantly affect the design, whereas the seismicity level at the site and the target probability of loss of containment had a significant impact. A design procedure was also used to develop risk-targeted freeboard maps for Slovenia. It was demonstrated that variation in the risk-targeted freeboard in Slovenia could be as much as 12-fold, which is certainly not negligible when selecting tank sites or defining the maximum liquid height for existing tanks.

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Data availability

The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.

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Funding

The work presented herein was partially carried out with a financial grant from the H2020 Marie Skłodowska Curie Innovative Training Network as part of the research project, XP-RESILIENCE (G.A. 721816). The authors also acknowledge funding from the Slovenian Research Agency (Research Program Earthquake Engineering, J2-0185). The first author acknowledges the support from the SafePlant s.r.l. (Rome, Italy).

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Authors and Affiliations

  1. Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, 1000, Ljubljana, Slovenia

    Stefano Caprinozzi, Jure Žižmond & Matjaž Dolšek

Authors
  1. Stefano Caprinozzi
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  2. Jure Žižmond
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  3. Matjaž Dolšek
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All authors contributed to the study conception and design, writing and reviewing of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Matjaž Dolšek.

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Caprinozzi, S., Žižmond, J. & Dolšek, M. Risk-targeted seismic design of the freeboard for steel storage tanks equipped with floating roofs. Bull Earthquake Eng 22, 5–28 (2024). https://doi.org/10.1007/s10518-022-01564-z

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