EXPERIMENTS ON THE WATER PRESSURE ON THE SIDE WALLS OF RECTANGULAR WATER TANK USING OBSERVED WAVE EXCITATION

Abstract

 Damage to stainless steel panel water distribution tanks has been reported in recent earthquakes. The guidelines for the seismic design of water supply facilities have been updated to include an examination of the seismic resistance of water tanks in terms of bulging. In the 2024 Noto Peninsula earthquake, stainless steel panel water tanks that had also been damaged in the 2007 Noto Peninsula earthquake were again at the exact location. Since many of the strong seismic motions observed were predominant in the periods of 1s or more, the effects of long-period responses due to sloshing (liquid surface oscillation) and short-period responses are considered. In this study, we conducted a shaking table experiment using a model water tank, assuming a rectangular water tank, and examined the dynamic water pressure on the side walls due to short-period waves, long-period waves, and observed waves, as well as visualizing the water flow. As a result, it was found that sloshing vibrations contributed to the side wall water pressure when the observed waves were used for excitation.