土体-博物馆-展柜-文物全系统中地震传递规律研究  

A study on the seismic transmission law in the whole system of a soil-museum structure-showcase-museum collection

作　　者：杨维国[1] 葛家琪 李斌斌 王萌[1] 刘佩[1] 邹晓光 YANG Weiguo;GE Jiaqi;LI Binbin;WANG Meng;LIU Pei;ZOU Xiaoguang(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Aviation Planning and Design Institute(Group)Company,Beijing 100120,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国航空规划设计研究总院有限公司,北京100120

出　　处：《振动与冲击》2023年第4期247-255,共9页Journal of Vibration and Shock

基　　金：国家重点研发计划(2019YFC1521000);中央高校基本科研业务费重点项目(2020JBZ110)。

摘　　要：为得到作用在文物上真实的地震动特性,建立土体-博物馆-展柜-文物全系统模型和刚性地基(博物馆-展柜-文物)全系统模型,选取3条地震波调幅进行时程分析,通过加速度、位移和文物转角等参数分析考虑土-结构相互作用(soil-structure interaction, SSI)的影响。以Ⅱ类场地为例,分析考虑土-结构相互作用下从土体到文物的震动传递规律,为判别文物在地震作用下的安全性提供更加准确的数据支持。结果表明:对结构而言,考虑SSI使算出的地震响应偏小。对展柜和文物而言,小震下考虑SSI使算出的地震响应偏小。但在中震和大震作用下,考虑SSI效应时展柜和文物的响应存在较多比刚性地基响应大的情况。基于保护文物的角度,在地震分析尤其是大震分析时应考虑SSI的影响。对Ⅱ类场地和4层钢筋混凝土框架结构,考虑SSI影响,在地震波从土体传递到文物这一过程中,大震下结构进入塑性,文物的动力放大系数最大值为5.70(含土体、结构、展柜的动力放大系数),最大滑移量129.69 mm,出现倾覆现象。各个传递环节频谱成分均有一定差别,结构、展柜及文物都会对地震波频谱产生影响,分析时应将每部分的影响都考虑进去。In order to obtain the true characteristics of ground motions acting on cultural relics, a soil-museum-showcase-cultural relics system model and a rigid foundation(museum-showcase-cultural relics) system model were established. Three seismic wave amplitude modulations were selected for time-history analysis. The analysis of parameters such as, displacement, and cultural relic angle considers the influence of soil-structure interaction(SSI). Taking the Class II site as an example, the analysis and consideration of the law of vibration transmission from soil to cultural relics under the soil-structure interaction provides more accurate data support for judging the safety of cultural relics under earthquake. Results show that for the structure, considering SSI makes the calculated seismic response smaller. For showcases and cultural relics, considering SSI under small earthquakes makes the calculated seismic response smaller. However, under the action of moderate and large earthquakes, the response of display cabinets and cultural relics when considering the SSI effect is often greater than that of rigid foundations. Based on the perspective of protecting cultural relics, the impact of SSI should be considered in earthquake analysis, especially large earthquake analysis. For the Class II site and the 4-story reinforced concrete frame structure, considering the influence of SSI, in the process of seismic wave transmission from the soil to the cultural relic, the structure enters plasticity under the earthquake, and the maximum dynamic amplification factor of the cultural relic is 5.70(including soil, structure, power amplification factor of the showcase), the maximum sliding amount is 129.69 mm, and the phenomenon of overturning occurs. The spectrum components of each transmission link have certain differences. The structure, display cabinets and cultural relics will all have an impact on the seismic wave spectrum. The impact of each part should be taken into account in the analysis.

关 键 词：文物 全系统模型 土-结构相互作用(SSI) 刚性地基 震动传递规律 

分 类 号：TU391[建筑科学—结构工程]