Seismic risk assessment of liquid overtopping in a steel storage tank equipped with a single deck floating roof
ID Caprinozzi, Stefano (Author), ID Paolacci, Fabrizio (Author), ID Dolšek, Matjaž (Author)

URLURL - Source URL, Visit https://doi.org/10.1016/j.jlp.2020.104269 This link opens in a new window

Major earthquakes have demonstrated that Natech events can be triggered by liquid overtopping in liquid storage tanks equipped with floating roofs. Thus, research on the dynamic behaviour of steel storage tanks with floating roofs is still required. In this paper, the seismic risk against liquid overtopping in a real steel storage tank with a floating roof was analysed using a simplified model that was validated by a refined finite element model based on the arbitrary Lagrangian-Eulerian approach. The simplified model utilizes the Lagrangian of a floating roof-fluid system and is capable of providing a response history of the floating roof. It was demonstrated that it could predict the maximum vertical displacement very accurately, while some differences were observed in the response history of vertical displacement. The computational time for a single response history analysis based on the simplified model amounted to a few minutes, which is significantly less demanding compared to hours required for response history analysis in the case of the refined FE model. The simplified model is thus appro-priate for the seismic fragility analysis considering the overtopping limit state. It is shown that the fragility curves are significantly affected by the liquid filling level. The risk for liquid overtopping is quite high in the case of a full tank. However, by considering the variation of filling level during the year, the overtopping risk was observed reduced by approximately 30%. Alternatively, the approximate fragility analysis for the liquid over-topping can be performed by utilizing the Eurocode formula for the vertical displacement of liquid. This approach is straightforward, but the formula does not account for the higher mode effects, which may result in overestimated seismic intensity causing overtopping, as discussed in the paper

Keywords:floating roof, steel storage tanks, simplified model, refined model, petrochemical plants, seismic fragility analysis, seismic risk assessment, risk mitigation, Eurocode 8, civil engineering, construction
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status:Published
Publication version:Author Accepted Manuscript
Number of pages:Str. 1-15
Numbering:Letn. 67/104269
PID:20.500.12556/RUL-124736 This link opens in a new window
ISSN on article:0950-4230
DOI:10.1016/j.jlp.2020.104269 This link opens in a new window
COBISS.SI-ID:37389827 This link opens in a new window
Publication date in RUL:13.02.2021
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Record is a part of a journal

Title:Journal of loss prevention in the process industries
Shortened title:J. loss prev. process ind.
Publisher:Butterworth Scientific
COBISS.SI-ID:20884519 This link opens in a new window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:13.02.2021

Secondary language

Keywords:plavajoča streha, jekleni rezervoarji, poenostavljeni modeli, podrobni modeli, analiza potresnega tveganja, zmanjšanje tveganja, Evrokod 8, gradbeništvo, konstrukcije


Funder:EC - European Commission
Project number:721816
Name:Extreme loading analysis of petrolchemicals plants and design of metamaterial-based shields for enhanced resilience

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