基于附加质量法的大型固定顶储液罐基底隔震分析  

Seismic analysis of a large base-isolated liquid storage tank with fixed roof based on added mass method

作　　者：张兆龙[1] 高博青[1] 杨宏康[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《振动与冲击》2012年第23期32-38,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51178414);浙江省自然科学基金资助项目(Y1110438)

摘　　要：鉴于目前储液罐基底隔震研究多采用一维简化的Haroun-Housner模型,基于附加质量法,考虑液体对流质量和脉冲质量,建立储液罐三维简化的附加质量模型。通过分析比较相同地震激励下不同高径比储液罐罐的Haroun-Housner模型、附加质量模型和流固耦合模型的动力响应,验证了附加质量模型的合理性。针对某大型固定顶储液罐,基于此简化模型,基底引入FPS隔震支座,系统地研究了基底隔震储液罐在不同场地条件下的非线性地震动力响应。分析结果表明:FPS隔震支座对储液罐地震响应有很好的控制作用,有效地降低了液体脉冲分量的运动,避免了罐壁发生屈曲破坏,但放大了液体对流分量的运动。The simplified one-dimensional Haroun-Housner model was used widely in seismic isolation study of liquid storage tanks. A simplified three-dimensional mechanical model was established on the basis of added mass method, considering liquid convective and impulsive masses. Validity of the model was verified with dynamic responses of Haroun- Housner model and fluid-solid coupling model under same seismic excitations. Using the model, nonlinear seismic response of a large base-isolated liquid storage tank with fixed roof and friction pendulum system （FPS） bearing was studied systematically under different site conditions. Results showed that FPS isolation bearing is effective in controlling the seismic response of the liquid storage tank, it decreases liquid impulsive motion and avoids the buckling failure of the tank shell, but increases liquid convective motion.

关 键 词：大型储液罐 附加质量法 单层球面网壳 隔震 地震响应 屈曲 

分 类 号：TU279.743[建筑科学—建筑设计及理论]