000020076 001__ 20076
000020076 005__ 20170118182353.0
000020076 04107 $$aeng
000020076 046__ $$k2017-01-09
000020076 100__ $$aPrinz, Gary
000020076 24500 $$aSeismic Fragility Analysis for Unanchored Steel Tanks Considering Shell Buckling

000020076 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020076 260__ $$b
000020076 506__ $$arestricted
000020076 520__ $$2eng$$aWhen unanchored steel liquid storage tanks are subjected to strong ground motions, the contained liquid impulses the tank shell causing uplift of the tank base. As the tank undergoes uplift, sections of the shell that remain in contact with the ground can experience large compressive forces often leading to buckling failure. This phenomenon has been documented in several reconnaissance reports following major earthquakes. In these reports, two types of shell buckling are commonly encountered: 1) elastic buckling (sometimes referred to as diamond bucking from the distinct diamond pattern that often emerges in the tank shell), and 2) plastic buckling (also called elephant foot buckling from the deformed tank shape which resembles an elephants foot bulging out at the bottom). This paper presents a method for determining the buckling vulnerability of unanchored steel tanks using simplified massspring models incorporated into the Open System for Earthquake Engineering Simulation (OpenSEES), and incremental dynamic analysis. The simplified mass-spring models simulate resistance to uplift, tank rocking, and provide an equilibrium-based approach to determining tank shell compressive forces resulting from dynamic earthquake loadings. Four existing tanks (considering both broad and slender geometries) are analyzed under 20 recorded ground motions, scaled at 30 different levels (from 0.05g to 1.5g) for a total of 2,400 dynamic analyses. Results from the incremental dynamic analyses are used to create fragility curves, wherein shell buckling probabilities are related to the level of seismic excitation. Results from the analyses on the four existing tank geometries highlight vulnerabilities for both broad and slender tank geometries under moderate seismic excitation.

000020076 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020076 653__ $$aunanchored steel tanks; fragility curves; dynamic analysis; shell buckling

000020076 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020076 720__ $$aPrinz, Gary$$iCortes, Gustavo
000020076 8560_ $$ffischerc@itam.cas.cz
000020076 8564_ $$s240575$$uhttps://invenio.itam.cas.cz/record/20076/files/509.pdf$$yOriginal version of the author's contribution as presented on USB, paper 509.
000020076 962__ $$r16048
000020076 980__ $$aPAPER