模型储罐三维地震反应振动台试验研究

针对立式钢制模型罐,进行了三维地震激励和一维地震激励振动台的动响应试验研究。结果表明:储罐在三维地震动激励下的反应与一维激励相比,加速度反应、罐壁的应变反应、储罐提离反应具有较明显的放大效应。位移反应在不同地震激励下,其放大效应不同,El Centro波激励下各测点三维激励下位移较一维激励下位移放大明显,Taft、天津波激励下各测点三维激励下位移较一维激励下位移有放大也有缩小,幅度均不大。由罐壁测点加速度功率谱分析表明:一维激励其峰值频率区域较为集中,主峰突出,能量主要集中于低频区;在三维地震激励下,频率峰值区域明显拉长,峰值点模糊,频率成份十分丰富,表现出多主峰的特点。

Finite element analysis of 3D seismic response of unanchored liquid storage tanks

This paper aims at studying the dynamic responses of vertical steel model tank under three dimensional and one dimensional seismic inputs on the shaking table.The results indicate that the wall acceleration,the base uplifting,the wall strains of the tank under three-dimensional seismic input is greater than that under one-dimensional seismic input.Magnifying effects of the displacement under different seismic inputs are different.There is either magnifying or reducing effect for the measuring point displacements of the tank wall under three-dimensional seismic input compared with that under one-dimensional seismic input.The analysis of measuring point acceleration power spectrum shows that the frequency extent of peak value is collective,and the main peak is significant,and the energy is concentrated on the lower frequency extent under one-dimensional seismic input.The frequency extent of peak value is broadened,and the frequency content is quite rich under three-dimensional seismic input.