Abstract

Abstract When a cylindrical tank is excited by seismic waves, liquid surface motion occurs in the tank. This motion is referred to as sloshing. When a large amplitude sloshing occurs, the liquid surface collides with the roof of the tank, and an impulsive vertical load acts on the roof. In our previous study, we proposed a predictive evaluation method of the vertical load. The proposed method consists of an impact pressure model, a simplified nonlinear sloshing liquid surface model, and a local liquid surface wave model. The predictive evaluation method almost agreed with test results of the vertical loads acting on load measurement equipment which is attached to a part of the roof of the test model. However, it is necessary to verify the predictive evaluation method for the vertical load acting on the whole roof. In this study, we proposed the modified predictive evaluation method to deal with large excitation amplitudes and verified this method for the vertical load on the whole roof by the CFD analysis. The modified predictive evaluation method tended to be larger than the CFD analysis under the high and low roof height conditions. On the other hand, the CFD analysis result was extremely larger than the modified predictive evaluation method under the middle roof height condition, despite the small excitation amplitude. In addition, the CFD analysis and the test under the same condition were extremely larger than the modified predictive evaluation method in the maximum load on load measuring equipment. In this study, we have also discussed this extremely large load, by the CFD analysis. We have found that the previous weak roof collision made the liquid surface a flat shape, and the collision between the flat liquid surface and the roof caused the extremely large load. The result shows that the collision history between the liquid surface and the roof has a significant effect on the vertical load on the roof.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.