Results of international code ACI-350 show that, the international codes assumptions have imprecise estimations of natural sloshing frequency in the range of hard to very soft soil categories. On the contrary, significant effects of wall flexibility are achieved considering SSI theory. Results indicate that there is no significant effect of wall s flexibility on natural sloshing frequency regarding fixed base assumptions of vessels. Fixed base condition with an emphasis on recommendations of international code ACI-350, analytical FSSI regarding equivalent mass spring method, and the numerical direct method regarding theory of finite element are taken into consideration. Regarding the aim of current study three different conditions of elevated tanks are applied. Furthermore, two new efficiently relations to find both of wall flexibility and soil-structure interaction effects on natural frequency are developed. The main purpose of this study is to establish the effects of vessel walls flexibility on its natural sloshing frequency considering soil-structure-fluid interaction theory. The result shows that the structure responses are exceedingly influenced by the presence of water and the earthquake characteristics. Tank responses including base shear, overturning moment and roof displacement have been observed, and then the results have been compared and contrasted. In addition to that impulsive mass of water has been added to the container wall using Westergaard's added mass approach.

For later conditions water mass has been considered in two parts as impulsive and convective suggested by GSDMA guidelines. Two models were simulated in empty, Half-full and full condition. The main objective of this study is the analytical evaluation of seismic response of elevated water tanks under different earthquake time history records with SAP2000 structural software. Also, dynamic fluid-structure interaction (FSI) plays an important effect in this complexity. Seismic analysis of hydrodynamic structure such as elevated concrete water tank is somewhat complex when compared with other structures.

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