
立式储罐基础隔震性能对比分析杨宇1
第35卷第9期(2016.09)规划设计
摘要:为了对采用滑移隔震支座、铅芯叠层橡胶隔震支座的基础隔震储罐的地震响应差异有一个综合的认识和理解,在考虑弹性壁振动对死动分量影响的情况下,分别建立了立式储维基础滑移隔囊、铅芯叠层橡胶支座隔震的数学模型及运动微分方程,制了相应的地震响应时程分析程序。计算结果表明,加速度峰值变化对滑移隔震的减震效果影响不明显,减震率变异系数小于1%,对铅芯叠层橡胶支座隔震的减震效果有一定影响,减囊率变异系数小于15%,储容积变化对两种隔宸体系的冕动波高控制效果影响较大,变异系数大于15%
关键词:储罐;滑移隔震;铅芯叠层橡胶支座隔震;地震响应 Doi :10.3969/j.issn.10066896.2016.9.013
Performance Comparison Analysis of Base lsolation of Vertical Storage Tanks n人up人
Abstract:
For a comprehensive understanding about seismic response differences of bdse iso*
lation tanks, i.e.sliding isolated bearing and lead rubber bearing isolation, considering the in fluence of elastic wall vibration to sloshing component, mathematical models and differential equations of motion are set up for base sliding isolation of vertical storage tanks and leed rub ber bearing isoletion, time history analysis program of seismic response is complicated. The results show that change of acceleration peak has no obvious influence to damping effect of sliding isolation, decreasing amplitude ratio is less than 1%. Change of acceleration peak has some influences to damping effect of lead rubber bearing isolation, decreasing amplitude ratio is less than 15%. Volume variation of tanks has a great influence to sloshing wave, decreasing amplitude ratio is more than 15%.
Key words: storage tanks; sliding isolation; lead rubber bearing isoletion; seismic response
目前对于立式储罐基础隔震研究多以Haroun-Housner模型为主",以Haroun提出的对流、脉冲和刚性质量的三质点力学模型为基础,并未考虑弹性壁振动对晃动分量的影响。本文在考虑液固耦联弹性报动因素对液体对流显动的影响下,以速度势理论下推导的储罐运动方程为基础,给出了滑移隔震支座、铅芯叠层橡胶隔震支座的隔震性能对比分析结果。
隔震支座
立式储罐基础隔震是通过在上部结构和基础之间设置隔震层,隔震层刚度较小,限制了地震动水平分量向上部结构的传递,减小了上部结构的相对位移和内力。滑移隔震支座是在基础顶面设置滑移
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层作为隔震层,通过滑移层与上部结构连接,当地震力作用使滑移层产生滑移时,隔震支座能够消耗和阻止地震能量的传递,常用的摩擦材料为聚四氟乙烯、铅粒和石墨等。铅芯叠层橡胶隔震支座由薄橡胶板和薄钢板分层交替叠合,中心圆孔处压人铝芯,经高温高压硫化粘结形成,由于橡胶层与钢板紧案黏结,当支座承受水平荷载时,橡胶层的相对位移减小,使橡胶支座可达到很大的整体侧移而不失稳,并且保持较小的水平刚度,同时铅芯具有提高支座的吸能能力,确保支座有适度的阻尼,增加支座的初始刚度、控制风反应和抵抗微震的作用铅芯叠层橡胶支座既具有隔震作用,又具有阻尼作用。
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