立式储罐储液晃动波面振动分析

针对真实地震作用下立式储罐的波面振动是否有高阶阵型的参与这一问题,通过有限元软件ADINA对一万方立式储罐作在地震作用下的晃动响应分析,并得出以下结论:立式储罐的晃动波高与输入地震动峰值加速度成线性关系,两激励波高与响应峰值加速度的比值相同;不同储液比对晃动波高和一阶晃动周期的影响较小;不同地震动作用下的晃动波高径向极值点位置不同,极值点越靠近罐心处,晃动参与振型越丰富,振型叠加越明显,并表明储液在地震作用下的晃动是由多阶振型叠加的结果。

A Wave Surface Vibration Analysis of Liquid Sloshing in Vertical Storage Tanks

Sloshing wave height of vertical storage tanks under earthquake action is one of the main criteria for tank design, and the wave height formulas of seismic codes for storage tanks at home and abroad are based on the theoretical formulas of first-order sloshing. Whether the wave surface vibration of vertical storage tanks under real seismic action involves the participation of higher order array is a problem needed to determine. In this study, the sloshing response of 10,000 square vertical storage tanks under earthquake action was analyzed by finite element software ADINA. The test results show that the sloshing wave height of vertical storage tanks is linearly related to the peak acceleration of input ground motion, and the ratio of the two excitation wave heights to the response peak acceleration keeps the same, and the influence of different liquid storage ratio on the sloshing wave height and the first-order sloshing period is small. In addition,the location of the radial extreme point of sloshing wave height remains different under different earthquake motions. The closer the extreme point was to the core of the tank, the richer the mode of sloshing participation is, the more obvious the mode superposition is. It shows that the sloshing of liquid storage under earthquake is the result of multi-order mode superposition.