地震动特征的统计分析
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摘要
统计了国内外287次5级以上的实际地震记录,研究了地震动峰值不对称比、持时、地震荷载类型的统计特征和规律。结果表明:地震动峰值具有明显的不对称性,可以用峰值不对称比描述,统计结果具有规律性,其平均值总体上随震级加大而略有降低,从5级到8级地震其范围变化为1.4～1.2;地震动持时随震级增大而增大,近似于线性增长,震级从5级至8级,持续时间从34秒增加到81秒;地震动荷载类型的统计结果具有规律性,振动型荷载所占比例与震级近似呈线性增长关系,震级小于6.5时,约1/3属于振动型,2/3属于冲击型荷载;震级在6.5以上时,则半数以上属于振动型。
Statistics at home and abroad were more than 287 magnitude 5 practical seismic records.The peak ground motion asymmetric ratio,the seismic load type,the statistical characteristics and laws were studied.The results show that the peak ground motion has obvious asymmetry,which can be expressed by peak asymmetry,statistical results show regularity,their average depresses with magnitude increase,between 1.4 and 1.2 from magnitude 5 to 8.Shaking increases with increase of linear growth,from 34 seconds to 81 seconds as the magnitude increases from 5 to8;Statistical results of load type regularity,and vibration model load proportion of approximate increase linearly with magnitude;if below magnitude 6.5,about 1/3 belong to vibration model,2/3 belong to impact type load;if above magnitude 6.5,half belong to vibration model.
Statistics at home and abroad were more than 287 magnitude 5 practical seismic records.The peak ground motion asymmetric ratio,the seismic load type,the statistical characteristics and laws were studied.The results show that the peak ground motion has obvious asymmetry,which can be expressed by peak asymmetry,statistical results show regularity,their average depresses with magnitude increase,between 1.4 and 1.2 from magnitude 5 to 8.Shaking increases with increase of linear growth,from 34 seconds to 81 seconds as the magnitude increases from 5 to8;Statistical results of load type regularity,and vibration model load proportion of approximate increase linearly with magnitude;if below magnitude 6.5,about 1/3 belong to vibration model,2/3 belong to impact type load;if above magnitude 6.5,half belong to vibration model.
引文
[1]田玉红,王培德.200 km震中距内的加速度记录和地震动特征[J].地震学报,1994,16(3):399-402.
[2]王景明.地面建筑物倾倒方向与强震地面运动[J].地震学报,1982,4(1):90-97.
[3]薄景山,李秀领,刘德东,等.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003,23(3):11-15.
[4]高玉峰,刘汉龙,朱伟.基于地震危险性分析的场地地震动持时特性研究[J].世界地震工程,2000,16(4):109-112.
[5]孟凡超.土体永久变形与地震荷载特征关系研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[6]Ambraseys N N.Macroseismic observations for somerecent earthquakes[C]//Proc.4th WCEE,Canada,1969:20-35.
[2]王景明.地面建筑物倾倒方向与强震地面运动[J].地震学报,1982,4(1):90-97.
[3]薄景山,李秀领,刘德东,等.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003,23(3):11-15.
[4]高玉峰,刘汉龙,朱伟.基于地震危险性分析的场地地震动持时特性研究[J].世界地震工程,2000,16(4):109-112.
[5]孟凡超.土体永久变形与地震荷载特征关系研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[6]Ambraseys N N.Macroseismic observations for somerecent earthquakes[C]//Proc.4th WCEE,Canada,1969:20-35.
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