摘要
采用有限元方法研究了基岩上均匀场地中透镜体对地震动影响的基本规律,分析了含透镜体的场地与不含透镜体的场地对地震动影响的差别,针对透镜体埋深、宽度、厚度、刚度以及输入波频谱等因素对地震动反应谱的影响进行了研究.研究表明,透镜体的存在对地震动有显著的放大作用,该放大作用可达49.7%;由于透镜体对入射波的散射,会产生竖向加速度,且竖向加速度的短周期成分相对较多;透镜体埋深、宽度、厚度、刚度以及输入波频谱等因素对地震动反应谱具有重要的影响.
The effect of lenticle in single layer on bedrock on ground motion was studied using finite element method.The difference between the effect of field with lenticle and that of field without lenticle on ground motion was analyzed and the impacts of the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum on response spectrum of the ground motion was also investigated.Study shows that lenticle has significant,that is,up to 49.7% amplification of the ground motion and leads to vertical acceleration with more short-period contents by scattering of the incident waves.In addition,the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum have great effect on response spectrum of the ground motion.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2010年第9期783-791,共9页
Journal of Tianjin University(Science and Technology)
基金
教育部博士点基金资助项目(200800560046)
关键词
透镜体
地震动
基岩上均匀场地
放大作用
反应谱
lenticle
ground motion
single layer on bedrock
amplification
response spectrum
