可移动文物隔震系统的地震动破坏强度排序

Quantitative Analysis of the Damage Potential of Input Ground Motion Based on Movable Cultural Relic Isolation Systems

为研究不同地震动对可移动文物的潜在破坏能力,本文以可移动文物隔震装置设计中的输入地震动为研究对象,推荐了典型周期的隔震系统输入地震动破坏强度排序.通过引入累积分布函数,并将结构根据周期划分为短、中、长3个频段,在每个周期段内建立典型隔震系统模型,基于隔震系统的非线性地震响应进行地震动破坏强度排序并合理优化,将优化后排序与基于隔震系统自振周期对应的弹性加速度反应谱值排序进行对比.结果表明:对于Ⅰ类场地,短周期模型的两种排序相似性约为75%;对于Ⅱ类场地,3个周期段模型的排序相似性高达90%以上,可以根据加速度反应谱排序定量选取输入地震动;对于Ⅲ类场地,排序相似性低于前两类场地,但对于中长周期隔震系统仍有70%的相似性.因此,基于单自由度弹性加速度反应谱排序结果,可为可移动文物隔震系统设计时选择输入不同破坏强度的地震动提供定量参考.

To assess the potential damage of different ground motions to movable cultural relics,this study focuses on the input ground motions of movable cultural relic isolation structures and quantitatively ranks the input ground motions on the basis of the damage potential.The cumulative distribution function is introduced,the short,medium,and long period ranges are divided,and the representative period isolation systems are established in each periodic section.The damage potential of input ground motions is quantitatively ranked and optimized on the basis of the response of the isolation systems.At the same time,the acceleration response spectrum at the natural vibration period of the structure is calculated and ranked,and two ranking results are analyzed and compared with each other.Results show that,for typeⅠsites,the similarity of the ground motion sequence of the short period structure is slightly low,approximately 75%.For typeⅡsites,the similarity of the ground motion sequence of the short,medium,and long period structures is more than 90%,and the input ground motion can be selected quantitatively on the basis of the sequence of the acceleration response spectrum.For typeⅢsites,the similarity of the ground motion sequence is lower than that of the first two sites,but its reference value still has 70%similarity for the medium and longperiod isolation systems.Therefore,the results of the acceleration response spectrum ranking can be used as a quantitative reference for the selection of input ground motion in the design of movable cultural relic isolation systems.