This dissertation presents the results of an in-depth investigation concerning the vibrational characteristics and seismic analysis of ground supported, circular cylindrical liquid storage tanks subject to a horizontal component of earthquake ground motion. The scope of the study includes empty, partially full, and completely full tanks.;Simple analytical expressions, in the form of cubic polynomials, are developed for empty tanks which accurately predict frequencies and radial mode shapes corresponding to the fundamental mode of vibration. These expressions form the basis of simplified procedures for determining shell stresses and displacements, base shears, and overturning moments induced in empty cylindrical tanks by earthquake ground motion. The effects of a roof structure and support conditions upon the vibrational characteristics of cylindrical tanks are also examined.;Analytical expressions, also in the form of cubic polynomials, are developed which accurately determine the fundamental natural frequency of the shell and the impulsive fluid mass. These expressions are applicable to tanks both half full and completely full with liquid. Simple procedures for assessing impulsive hydrodynamic wall pressures, and the resulting shell stresses, base shears, and overturning moments induced in flexible tanks by a horizontal component of earthquake ground motion are presented. Numerical comparisons which verify the accuracy of the procedures developed in this investigation are provided.
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