晃动分量对储罐地震响应的影响研究

Effects of Sloshing Component on Seismic Response of Tanks

基于Haroun模型,考虑罐壁液固耦联及罐体的平动和转动,将储罐体系简化为三质点体系力学模型,罐内液体质量等效为对流质量、脉冲质量和刚性质量,通过时程分析法计算储罐的地震响应,并与不考虑液体晃动分量影响的两质点体系的地震响应进行对比,分析晃动质量对储罐抗震的影响。以系列储罐为例,分析两种体系不同场地储罐的地震响应。结果表明:通过两质点体系模型计算的基底剪力和基底弯矩与三质点体系的计算结果相差不大,实际工程中,可以按照两质点进行计算分析;按照三质点体系模型进行计算能够得出液体的晃动波高,利于分析液体晃动对浮顶产生的影响,因此在进行储罐抗震计算时,将储罐简化为考虑液体晃动分量的三质点体系力学模型便于分析晃动效应。

The tank system is simplified as a mechanical model for a three -particle system based on Haroun＇s model, with liquid - solid coupling of tank walls and the translation and rotation of the tank body considered. The continuous liquid mass is lumped as convective mass, impulsive mass and rigid mass. The seismic response of tanks is calculated by the time - history analysis method. Effects of the sloshing mass on the seismic resistance of tanks are analyzed through comparison with the seismic response of a two - particle system in which effects of the liquid＇s sloshing component is not considered. With a series of tanks as an example, the seismic response of tanks at different sites is analyzed for the two systems. The result shows that： there are small differences in calculation results of base shear and base moment between the two - par- ticle system and the three -particle system, so the two -particle system can be adopted for cal- culation and analysis in real - world projects; the sloshing wave height of the liquid can be worked out based on the three -particle system model, which is beneficial to analyzing effects of liquid sloshing on the floating roof. As a result, simplifying tanks as a three - particle system model in which the sloshing component of the liquid is considered is beneficial to analyzing slos-hing effects when the seismic resistance of tanks is calculated.