摘要
选取云冈石窟中的典型石窟作为研究对象,建立了三维的石窟计算模型,首先输入水平方向地震荷载,计算了石窟岩体的位移和应力分布情况。结果表明,石窟的立柱部分和入口处易产生较大位移;石窟周围,尤其是洞窟开挖的薄壁部位,容易形成压应力、拉应力和剪应力的集中区,是石窟围岩容易破坏的地方。再输入竖向和横向的地震荷载进行比较,结果表明,竖向地震荷载对石窟拉应力的影响较横向地震荷载更为显著,但竖向地震荷载产生的压应力值远较横向地震荷载的为小;而横向地震荷载比竖向地震荷载更容易引起最大剪应力集中,即更容易导致石窟的破坏。
This paper develops a 3-D finite element model of Yungang Grottoes and conducts nonlinear time history analysis considering the combination of horizontal and vertical earthquake motions.Distribution of stress and displacement of the Grottos rockmass was calculated.The results show that larger displacement appears in the pillar and entrance of grottoes,tension,shear and compression stresses concentrate in the grottoes,especially around thin-walled position.Then,comparing the input of vertical and horizontal seismic loads,the influence of vertical seismic load on tensile stress is more significant,the compression stress from vertical seismic load is substantially smaller than that from horizontal seismic load,but the horizontal seismic load is more likely to cause shear stress concentration and more easier to cause destruction the of grottoes.
出处
《世界地震工程》
CSCD
北大核心
2011年第4期37-43,共7页
World Earthquake Engineering
基金
国家社会公益研究专项(编号:2002DIB20062)资助
关键词
云冈石窟
地震荷载
动力响应
有限元模拟
Yungang Grottoes
seismic load
dynamic response
finite element simulation
