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Surrogate Modeling for the Seismic Performance Assessment of Liquid Storage Tanks

2016; American Society of Civil Engineers; Volume: 143; Issue: 4 Linguagem: Inglês

10.1061/(asce)st.1943-541x.0001667

1943-541X

Konstantinos Bakalis, Michalis Fragiadakis, Dimitrios Vamvatsikos,

Fluid Dynamics and Vibration Analysis

A three-dimensional surrogate model is presented for the seismic performance assessment of cylindrical atmospheric liquid storage tanks. The proposed model consists of a concentrated fluid mass attached to a single vertical beam-column element that rests on rigid beam-spokes with edge springs. The model is suitable for rapid static and dynamic seismic performance assessment. Contrary to other simplified models for tanks, its properties are determined through a simple structural analysis that can be performed in any nonlinear analysis software, without the need for complex finite-element models. The results compare favorably to those of three-dimensional finite-element models on three tanks of varying aspect ratios. A step-by-step example of the modeling procedure is presented for a squat unanchored tank, and a sensitivity analysis is conducted in order to investigate the effect of various modeling parameters on the seismic response of the proposed tank model.