不同场地类型下基础隔震高举架储油罐减震效果分析

Analysis of the earthquake absorption effect of the base isolation highly-elevated oil storage tanks on different sites

在高举架储油罐支架底部设置基础隔震橡胶垫，建立了考虑刚性脉冲质量、对流质量、液固耦合质量的三质点基底隔震体系简化分析模型，分析了不同体积的高举架储油罐在不同场地条件下的地震反应．以及高举架储油罐隔震效果受地震场地的影响．结果表明：I类场地减震效果对隔震频率的变化不敏感．可用频率段宽，Ⅱ．Ⅲ，Ⅳ类场地减震效果对隔震频率的变化较敏感．可用频率段窄．4类场地的理想隔震频率段为0．5～4．0rad／s=对应某一减震效果．4类场地的可用频率段发生明显变化；4类场地对波高均产生放大作用，但放大幅度较小．可不予考虑．

The rubber pillow of base isolation is installed in the bottom of the bracket of the highly-elevated oil storage tanks. The simplified analysis model for the three-particle base isolation system is given, considering the rigid impulse convection and liquid-solid coupling mass. The analysis of the seismic response of highly-elevated oil storage tank of different body forms is processed under the different sites, and the effects of different sites on the effect of earthquake mitigation is analyzed. The research indicates that the effect of earthquake mitigation of site I is not sensitive to the change of the base isolation frequency, and the useable frequency has a wide bound. The effect of earthquake mitigation of sites II, III and IV is sensitive to the change of the base isolation frequency, and the useable frequency has a narrow bound. The ideal bound of the base isolation frequency is rad/s. The useable frequency of the four sites has an obvious change for a certain effect of earthquake mitigation. The wave height is magnified for the four sites, and this is not calculated because the magnified extent is limited.