Seismic risk assessment of liquid overtopping in a steel storage tank equipped with a single deck floating roof

Caprinozzi, Stefano (avtor), Paolacci, Fabrizio (avtor), Dolšek, Matjaž (avtor)

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

• Jezik: Angleški jezik
• Ključne besede: floating roof, steel storage tanks, simplified model, refined model, petrochemical plants, seismic fragility analysis, seismic risk assessment, risk mitigation, Eurocode 8, civil engineering, construction
• Vrsta gradiva: Znanstveno delo
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2020
• Št. strani: Str. 1-15
• Številčenje: Letn. 67/104269
• PID: 20.500.12556/RUL-124736
• UDK: 624.042.7
• ISSN pri članku: 0950-4230
• DOI: 10.1016/j.jlp.2020.104269
• COBISS.SI-ID: 37389827
• Datum objave v RUL: 13.02.2021

Gradivo je del revije

• Naslov: Journal of loss prevention in the process industries
• Skrajšan naslov: J. loss prev. process ind.
• Založnik: Butterworth Scientific
• ISSN: 0950-4230
• COBISS.SI-ID: 20884519

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 13.02.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: plavajoča streha, jekleni rezervoarji, poenostavljeni modeli, podrobni modeli, analiza potresnega tveganja, zmanjšanje tveganja, Evrokod 8, gradbeništvo, konstrukcije

Projekti

• Financer: EC - European Commission
• Številka projekta: 721816
• Naslov: Extreme loading analysis of petrolchemicals plants and design of metamaterial-based shields for enhanced resilience
• Akronim: XP-RESILIENCE