波頭衝突を伴う固定屋根付き円筒タンク内容液の地震時スロッシング解析

抄録

This paper describes the applicability of the numerical model on estimating of sloshing wave crest impact pressure acting on a fixed roof of cylindrical tank. A large shaking table test, conducted on the E-Defence shaking table, has been analyzed. In the shaking table test, partially water-filled cylindrical tank with the flat fixed roof was subjected to the earthquake motion recorded in the site of the existing nuclear power plant, when the Niigataken Chuetsu-oki earthquake occurred in 2007. In order to clarify the liquid sloshing behaviour observed from the tests, we conducted the numerical simulations of the observed violent sloshing phenomena with strong nonlinearity, such as splash of the tank liquid, breaking waves and so on, by using the open source code “OpenFOAM”. Based on the computed results, time histories of pressure acting on the tank roof and wall is presented. The numerical model well simulated the observed waveform with a sharp large pressure peak at the time of liquid impact on the tank wall. As for the liquid impact zone of the tank roof, the numerical computations indicated good agreement with the observed results.