纵向地震峰值加速度对生土窑居稳定性的影响  

Stability Analysis of Loess Cave Dwellings under Longitudinal Earthquake

作　　者：郭平功[1] 

机构地区：[1]河南城建学院土木工程学院,河南平顶山467000

出　　处：《工程抗震与加固改造》2016年第4期133-138,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家"十二五"科技支撑计划课题(2014BAL06B03)

摘　　要：在黄土高原上,数千万人居住在窑洞中,且很多地区处于地震带上,进行生土窑居的地震反应分析有助于探讨如何提高其稳定性。基于对河南陕县生土窑居的调研和测绘,建立窑居的三维模型,分析了纵向地震情况下峰值加速度、黄土强度对窑居稳定性的影响,并对比了纵向地震和横向地震下窑居塑性区、窑顶的位移变化。结果表明,纵向地震波的峰值加速度小于1m/s^2时,不会出现塑性区,生土窑居可正常使用;窑顶的竖向位移绝对值在窑脸处最大,沿进深方向逐渐减小,宜用三维模型进行分析;黄土强度对抗震性能有着显著的影响;纵向地震比横向地震对生土窑居的影响更为不利。On the Loess Plateau,tens of millions of people live in caves,and many areas are in the seismic belt,the seismic response analysis of the loess cave dwelling is helpful to improve its stability. Based on the survey and mapping of loess cave dwellings in Shan City of Henan Province,the three-dimensional model is built,the influence of peak acceleration and loess strength is analyzed,the plastic zone and the displacement of cave top are compared. The results show that,there will be no plastic zone when the longitudinal peak acceleration is smaller than 1m/s^2,the loess cave can still be used,the vertical displacement of cave＇s top is the biggest at front face,and smaller along deep direction,so the three dimensional model is proper,the strength of loess has obvious influence,and the longitudinal earthquake is much danger than the crosswise earthquake

关 键 词：纵向地震 生土窑居 塑性区 位移 黄土强度 

分 类 号：TU361[建筑科学—结构工程] TU352.1