Abstract
The dynamic characteristics of rigid, cylindrical or square tanks with concentric openings (manholes) are studied using detailed FEM and approximate discrete models. Parametric studies are presented, in the form of practical design charts, for various geometrical configurations. Further on, the dynamic analysis of a historic water tower is attempted, where the hollow cylindrical tank and the supporting structure are modelled in detail. Comparison studies to other approximate analyses are discussed. Seismic analyses of the water tower are performed considering fixed base conditions, the usual design assumption, and complete fluid–structure-soil interaction effects. The dynamic characteristics of the soil are accounted via a simplified frequency-independent mass-spring-damping model for rigid ring foundations.
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