A risk-targeted seismic performance assessment of elephant-foot buckling in walls of unanchored steel storage tanks

Luz Elizabeth Vasquez Munoz (Author), Matjaž Dolšek (Author)

Abstract

Unanchored steel storage tanks are used in industrial plants to store oil and other petrochemical liquids. In a major earthquake, such tanks may sustain different types of damage, including elasto-plastic buckling in the shape of an elephant’s foot, which is the object of the research. The methodology introduced in this paper consists of cloud-based 1D site response analysis (SRA) and pushoverbased seismic performance assessment of the tank wall using a 3D non-linear model of the tank. The SRA, which considers the recorded ground motions on the rock outcrop and the sample of interval shear-wave velocity profiles, is carried out to estimate spectral accelerations at the tank impulsive period. By adopting the code-based model of hydrodynamic pressures, the seismic demand on the tank wall is then calculated by pushover analysis. The risk-targeted decision model is used for safety verification. The proposed methodology is demonstrated through an example of a large liquid storage tank for which it is shown that the fragility function for peak ground acceleration at the rock outcrop is on the left side of the target fragility function, indicating that the tank cannot be considered safe from elephant-foot buckling. The introduced assessment process is relatively simple if the cloud-based SRA is automated. However, further experimental and numerical investigations are required to confirm the validity range of the pushover analysis for the seismic performance assessment of tanks.

Keywords

elephant-foot buckling;pushover analysis;seismic fragility analysis;seismic risk;site response analysis;unanchored steel storage tanks;uklon slonje noge;potisna analiza;analiza potresne ranljivosti;potresno tveganje;analiza odziva tal;nepritrjeni jekleni rezervoarji;

Data

Language:	English
Year of publishing:	2023
Typology:	1.01 - Original Scientific Article
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
UDC:	624.042.7
COBISS:	165428483
ISSN:	0098-8847
Views:	73
Downloads:	7
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	uklon slonje noge;potisna analiza;analiza potresne ranljivosti;potresno tveganje;analiza odziva tal;nepritrjeni jekleni rezervoarji;
Type (COBISS):	Article
Pages:	str. 4126-4147
Volume:	ǂVol. ǂ52
Issue:	ǂiss. ǂ13
Chronology:	okt. 2023
DOI:	10.1002/eqe.3903
ID:	20386143