SEISMIC ANALYSIS OF BASE-ISOLATED CYLINDRICAL LIQUID STORAGE TANK USING COUPLED ACOUSTIC-STRUCTURAL INTERACTION

Abstract eng:
Seismic analysis of three-dimensional (3-D) ground-supported base-isolated cylindrical liquid storage tank is investigated using coupled acoustic-structural interaction approach. In this approach of finite element (FE) method the contained liquid in tank is modeled with acoustic elements, having only pressure degree-of-freedom. By using the present approach the impulsive and convective or sloshing components acting on the tank can be evaluated separately by using the appropriate boundary conditions on the top of free liquid surface. The study is performed for two base isolation systems, elastomeric bearing and sliding system, which are modeled as non-linear connectors in the present study. A parametric study is performed to study the effectiveness of the proposed analysis method for broad and slender base-isolated tanks. The sloshing displacement and base shear time history responses are evaluated for 3-D tanks subjected to uni-directional earthquake ground motions. The FE time history responses are compared with the non-isolated 3-D tanks and it is found that the impulsive component of base shear has reduced more as compared to convective component of base shear. It is also seen that sloshing displacement was unaffected by the application of both the isolation systems.

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