基于现行规范场地划分标准的地震动峰值加速度衰减关系研究  

Attenuation relation of strong ground motion PGA based on classified site criterion in current seismic design code

作　　者：席远[1] 耿淑伟[1] 董满生[2] 陈鹏[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学交通运输工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2012年第9期1264-1268,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家973计划资助项目(2008CB425801);合肥工业大学博士后基金资助项目(20110490833)

摘　　要：文章搜集了美国西部近几年场地钻孔资料和近几年的强震记录,根据钻孔资料把强震记录按照我国《建筑抗震设计规范》(GB 50011-2010)中的规定进行场地分类,利用这些强震记录建立了适合我国场地的地震动峰值衰减关系。在衰减关系模型中考虑到了震级饱和和近场距离饱和特性,统计得到了Ⅰ、Ⅱ、Ⅲ类场地的地震动峰值加速度的衰减关系并分析了其特点。通过将Ⅰ类场地地震动PGA的衰减关系和其他研究的基岩场地衰减关系对比,可以看出第Ⅰ类场地得到的水平与竖向PGA衰减曲线和其他研究的基本一致。由此说明只要场地分类相同,使用各地区同类场地的强震记录进行地震动参数研究是可行的。研究结果为我国各类场地的PGA的估计提供了依据。The boring data and strong motion records in the western United States in recent years are collected, and the strong motion records with boring data are classified by the criterion in the Code for Seismic Design of Building（GB 50011--2010） in China. Then the attenuation relation of peak ground motion is established by the simulation based on strong motion records, which are suitable for China. The saturation of ground mo- tions near the epicenter with respect to both magnitude and distance is also emphasized in the attenuation models, the attenuation relation of peak ground acceleration（PGA） in sites category I, l-/and 1]I is obtained and its characters are analyze＆ Compared with the studies of the attenuation relation of the rock sites, it is found that the horizontal and vertical PGA attenuation curve in site category I is in basic accordance with other researchers＇ results. So as long as the category of site is the same, studying the ground motion parameter by using strong motion records in different areas is feasible. The study provides a basis for the estimation of the PGA on various sites in China.

关 键 词：场地分类 地震动 加速度峰值 衰减关系 

分 类 号：P315.9[天文地球—地震学]