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Seismic assessment of unanchored steel storage tanks by endurance time method
Authors:M Alembagheri  H E Estekanchi
Institution:1. Department of Civil Engineering, Sharif University of Technology (SUT), P.O. Box 11155-9313, Tehran, Iran
Abstract:Liquid storage tanks are essential structures that are often located in residential and industrial areas; thus an assessment of their seismic performance is an important engineering issue. In this paper, the seismic response of unanchored steel liquid storage tanks is investigated using the endurance time (ET) dynamic analysis procedure and compared to responses obtained for anchored tanks under actual ground motions and intensifying ET records. In most cases, the results from ground motions are properly obtained with negligible differences using ET records. It is observed that uplifting of the tank base, which is closely related to the tank aspect ratio, has the greatest significance in the responses of the tank and can be predicted with reasonable accuracy by using currently available ET records.
Keywords:steel liquid storage tanks  endurance time method  seismic assessment  intensifying dynamic excitation  tank base uplifting
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