Effect of fill depth, compressibility and surface waves on hydrodynamic response due to seismic excitation of a rectangular tank.

摘要

The present work was undertaken to understand how fill depth, compressibility and surface waves affect hydrodynamic response in a rigid rectangular tank excited by ground motion. In order to execute a comprehensive study several ground motions of varied characteristics, specific tank geometry defining fill depth ratios ranging from 0.08 to 1.0 and three fluid models representing acoustic and surface waves have been investigated. The fluid models have been developed using the boundary element method and validated. The fluid models have then been applied to predict hydrodynamic response parameters such as maximum hydrodynamic pressure, normalized hydrodynamic force, surface elevation, surface profile and pressure distribution on the vertical walls of a rigid rectangular tank subject to seismic excitation. Comparative study of the response parameters has established relationships between the dynamic characteristics of ground motion and the dynamic characteristics of fluid system taking into account the effects of compressibility and surface waves. The generality of the established dynamic relation between ground motion and that of a fluid system has been verified by testing with different ground motion data. The knowledge of the interaction between input ground motion and fluid system in the context of fluid compressibility and surface waves will enable an engineer or researcher to compute realistic hydrodynamic pressure values in a cost effective manner by choosing the appropriate fluid model suited for the problem at hand.