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Structural Engineering and Mechanics
  Volume 21, Number 1, September10 2005, pages 101-119

Seismic evaluation of fluid-elevated tank-foundation/soil systems in frequency domain
R. Livaoglu and A. Dogangun

    An efficient methodology is presented to evaluate the seismic behavior of a Fluid-Elevated Tank-Foundation/Soil system taking the embedment effects into accounts. The frequency-dependent cone model is used for considering the elevated tank-foundation/soil interaction and the equivalent spring-mass model given in the Eurocode-8 is used for fluid-elevated tank interaction. Both models are combined to obtain the seismic response of the systems considering the sloshing effects of the fluid and frequency-dependent properties of soil. The analysis is carried out in the frequency domain with a modal analysis procedure. The presented methodology with less computational efforts takes account of; the soil and fluid interactions, the material and radiation damping effects of the elastic half-space, and the embedment effects. Some conclusions may be summarized as follows; the sloshing response is not practically affected by the change of properties in stiff soil such as S1 and S2 and embedment but affected in soft soil. On the other hand, these responses are not affected by embedment in stiff soils but affected in soft soils.
Key Words
    fluid-structure-foundation/soil interaction; elevated tanks; freqency domain analaysis.
Karadeniz Technical University, Department of Civil Engineering, 61080, Trabzon, Turkey

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