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Title:: The EPA Mean Spectrum for the Selection of the Strong Ground Motion Records

作者:: 李琳¹; 任叶飞²; 温瑞智²; 冀昆²; (1.哈尔滨学院黑龙江省地下工程技术重点实验室,黑龙江哈尔滨,150086; 2.中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨,150080)

Author(s):: LI Lin¹; REN Yefei²; WEN Ruizhi²; JI Kun²; (1.Key Laboratory of Underground Engineering Technology of Heilongjiang Province,Harbin University,Harbin 150086,Heilongjiang,China)(2.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake A

Keywords:: target spectrum; strong-motion records selection; the EPA mean spectrum

摘要:: 强震动记录的选取对结构分析的结果影响极大,现行抗震设计规范对于强震动记录选取的规定比较宽泛,匹配结果难以达成。以区划图和抗震设计规范为依据,采用强震动记录数据建立符合抗震设防要求的有效峰值加速度(EPA)均值目标谱,并将其用于强震动记录选取。EPA均值目标谱体现了场地条件和地震环境对反应谱形状的控制作用,与规范标准谱相比更符合实际的谱形特征。采用EPA均值目标谱全周期匹配选取记录,结果表明匹配程度显著优于规范目标谱,基本满足全周期匹配各周期点上反应谱均值与目标谱相对误差小于20%的规范要求。

Abstract:: The strong-motion records selection has a lot of influence on the analysis result of the earthquake resistant design,and has been become a hot issue in the field of earthquake engineering.On the selection of strong-motion records,details of the provisions codes are sketchy in the current seismicity,and then they are hardly carried out.Firstly,the concept of the EPA mean spectrum is proposed on the basis of strong-motion recordings database for the selection,combined with seismic zoning map.The shape of the EPA mean spectrum reflects the influence of site effect.Compared with the target design spectrum in the code,it's more reasonable and close to real records spectrum.Then,the selection results show that the matching degree has improved significantly,using the EPA mean spectrum as the target.The results using EPA mean spectrum would satisfy the regulation that the matching degree is less than 20% during the selection.Finally,the method of the EPA mean spectrum provide an innovative approach for the seimic design ground motin selection.