防灾减灾工程学报2017，Vol.37Issue(2)：201-207,7.DOI:10.13409/j.cnki.jdpme.2017.02.004
罕遇地震下敦煌莫高窟彩塑动力响应数值模拟
Numerical Simulation of Dynamic Responses of Painted Sculptures of Dunhuang Mogao Grottoes under Rare Earthquakes
摘要
Abstract
Painted sculptures of Dunhuang Mogao Grottoes are important constituents of Dunhuang's cultural art.To study the safety of painted sculptures under rare earthquakes,the finite element models were built according to internal structure of painted sculptures,which are made of wooden frame,reed-padded layer,coarse clay layer and fine clay layer from internal to external.By comparing sweep frequency experiment results with modal analysis results,it is proved that the finite element models can reflect the dynamic performance of painted sculptures.On the basis of this,the response of painted sculptures under rare earthquakes was calculated,the re sults of model's stress,displacement and acceleration were analyzed,and the earthquake-resistant performance of painted sculptures was evaluated.The results show under rare earthquakes the standing posture model's maximum stress is within permitted range,but it is close to failure value.The positions in which standing posture model appear damage are below model's leg region,around neck and joint of arm and upper half body;the maximum stress appears in the joint of sitting posture model's back and base.The value exceeds tensile strength,tensile failure occurs.The maximum response spots are tops of models.The response of sitting posture is less than standing posture.It is considered that there is a risk of damage to painted sculptures under rare earthquake.关键词
敦煌莫高窟/彩塑/罕遇地震/动力响应/数值模拟Key words
Dunhuang Mogao Grottoes/painted sculptures/rare earthquake/dynamic responses/numerical simulation分类
建筑与水利引用本文复制引用
李利莎,杜建国,刘洪丽,陈荣华..罕遇地震下敦煌莫高窟彩塑动力响应数值模拟[J].防灾减灾工程学报,2017,37(2):201-207,7.基金项目
国家科技支撑计划课题项目(2013BAK01B01)资助 （2013BAK01B01）
