南北地震带川滇甘陕地区竖向与水平向加速度反应谱比的统计分析
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摘要
本文收集了从南北地震带川滇甘陕地区263个有详细场地资料的强震台站获得的802组强震动记录,按照场地、震级和震中距等因素统计分析了竖向与水平向加速度反应谱比的形状以及不同场地、震级和震中距下不同周期段内的谱比平均值,并与建筑抗震规范GB50011—2010规定的0.65进行了比较。结果表明:竖向与水平向加速度反应谱比受场地、震级和震中距等因素的影响;Ⅰ类和Ⅱ类场地在全周期段的谱比均值基本上大于0.65;无论何种分组情况谱比均值在0.1—1.0 s周期范围内基本低于定值0.65,周期大于1.0 s的谱比均值基本上远高于0.65。因此对于大部分抗震规范直接把竖向地震作用取为水平向地震作用的0.65倍,有待商榷。本文建议根据水平向反应谱的标定方式来确定现有竖向强震动记录的竖向地震作用。
Based on 802 groups of strong ground motions collected from 263 sites in Sichuan,Yunnan,Gansu and Shaanxi Provinces,this paper analyzes the shape of the vertical to horizontal acceleration response spectra ratios on the condition of different site conditions,magnitudes and epicentral distances,as well as corresponding average value of the spectra ratio in different period intervals. And then the average spectral ratio values are compared with the standard value 0.65 specified in the Code for Seismic Design of Buildings(GB50011-2010).The results show that the ratios of vertical to horizontal acceleration response spectra are affe cted by the factors such as site,magnitude and epicentral distance. The spectral ratio of class Ⅰand class Ⅱ sites in the whole period is basically greater than 0.65. Whatever the grouping situation,the mean value of spectral ratio in the period of 0.1-1.0 s is lower than 0.65. In the period larger than 1.0 s,the spectral ratio is basically much higher than 0.65. Therefore,it is worth discussing that the ratio of vertical to horizontal seismic influence coefficients is set as0.65 in most of the codes for seismic design of building. It is suggested that the vertical seismic action of the existing vertical strong motion records should be determined according to the calibration method of the horizontal response spectrum.
Based on 802 groups of strong ground motions collected from 263 sites in Sichuan,Yunnan,Gansu and Shaanxi Provinces,this paper analyzes the shape of the vertical to horizontal acceleration response spectra ratios on the condition of different site conditions,magnitudes and epicentral distances,as well as corresponding average value of the spectra ratio in different period intervals. And then the average spectral ratio values are compared with the standard value 0.65 specified in the Code for Seismic Design of Buildings(GB50011-2010).The results show that the ratios of vertical to horizontal acceleration response spectra are affe cted by the factors such as site,magnitude and epicentral distance. The spectral ratio of class Ⅰand class Ⅱ sites in the whole period is basically greater than 0.65. Whatever the grouping situation,the mean value of spectral ratio in the period of 0.1-1.0 s is lower than 0.65. In the period larger than 1.0 s,the spectral ratio is basically much higher than 0.65. Therefore,it is worth discussing that the ratio of vertical to horizontal seismic influence coefficients is set as0.65 in most of the codes for seismic design of building. It is suggested that the vertical seismic action of the existing vertical strong motion records should be determined according to the calibration method of the horizontal response spectrum.
引文
耿淑伟,陶夏新.2004.地震动加速度反应谱竖向分量与水平分量的比值[J].地震工程与工程振动,24(5):33-38.Geng S W,Tao X X.2004.The ratios of vertical to horizontal acceleration response spectra[J].Earthquake Engineering and Engineering Vibration,24(5):33-38(in Chinese).
贾俊峰,欧进萍.2010.近断层竖向与水平向加速度反应谱比值特征[J].地震学报,32(1):41-50.Jia J F,Ou J P.2010.Vertical-to-horizontal acceleration response spectrum ratio of near-fault ground motion[J].Acta Seismologica Sinica,32(1):41-50(in Chinese).
李恒,秦小军.2010.竖向与水平向地震动加速度反应谱比特性分析[J].地震工程与工程振动,30(1):8-14.Li H,Qin X J.2010.Study on characteristics of vertical to horizontal acceleration response spectral ratio[J].Journal of Earthquake Engineering and Engineering Vibration,30(1):8-14(in Chinese).
齐娟,罗开海,杨小卫.2014.竖向地震动特性的统计分析[J].地震工程与工程振动,34(增刊1):253-260.Qi J,Luo K H,Yang X W.2014.Statistical analysis on characteristics of vertical ground motions[J].Earthquake Engineering and Engineering Dynamics,34(S1):253-260(in Chinese).
王国权.2001.921台湾集集地震的断层地面运动特征[D].北京:中国地震局地质研究所:106-108.Wang G Q.2001.The Characteristics of Near Fault Ground Motion Caused by the 1999 Chi-Chi,Taiwan,Earthquake[D].Beijing:Institute of Geology,China Seismological Bureau:106-108(in Chinese).
谢俊举,温增平,高孟潭,胡聿贤,何少林.2010.2008年汶川地震近断层竖向与水平向地震动特征[J].地球物理学报,53(8):1796-1805.Xie J J,Wen Z P,Gao M T,Hu Y X,He S L.2010.Characteristics of near-fault vertical and horizontal ground motion from the 2008 Wenchuan earthquake[J].Chinese Journal of Geophysics,53(8):1796-1805(in Chinese).
徐龙军,谢礼立.2007.竖向地震动加速度反应谱特性[J].地震工程与工程振动,27(6):17-23.Xu L J,Xie L L.2007.Characteristics of acceleration response spectra for vertical ground motions[J].Journal of Earthquake Engineering and Engineering Vibration,27(6):17-23(in Chinese).
赵培培.2017.设计反应谱拟合方法研究及特征参数统计[D].哈尔滨:中国地震局工程力学研究所:20-22.Zhao P P.2017.Statistics of Characteristic Parameters and Research on Fitting Method of Design Response Spectrum[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration:20-22(in Chinese).
赵培培,王振宇,薄景山,张建毅.2017.川滇甘陕地区设计反应谱特征周期的统计分析[J].世界地震工程,33(2):97-104.Zhao P P,Wang Z Y,Bo J S,Zhang J Y.2017.Statistical analysis of characteristic periods of design response spectra in Sichuan,Yunnan,Gansu and Shaanxi[J].World Earthquake Engineering,33(2):97-104(in Chinese).
中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.2010.GB50011-2010:建筑抗震设计规范[S].北京:中国建筑工业出版社:20-41.Ministry of Housing and Urban-Rural Development of the People’s Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People’s Republic of China.2010.GB50011-2010:Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press:20-41(in Chinese).
周正华,周雍年,卢滔,杨程.2003.竖向地震动特征研究[J].地震工程与工程振动,23(3):25-29.Zhou Z H,Zhou Y N,Lu T,Yang C.2003.Study on characteristics of vertical ground motion[J].Earthquake Engineering and Engineering Vibration,23(3):25-29(in Chinese).
周正华,林淋,王玉石,王伟.2007.竖向地震动反应谱[J].防灾减灾工程学报,27(增刊):33-36.Zhou Z H,Lin L,Wang Y S,Wang W.2007.The response spectrum of vertical ground motion[J].Journal of Disaster Prevention and Mitigation,27(S):33-36(in Chinese).
Ambraseys N N,Douglas J.2003.Near-field horizontal and vertical earthquake ground motions[J].Soil Dyn Earthq Eng,23(1):1-18.
Bozorgnia Y,Niazi M.1995.Characteristics of free-field vertical ground motion during the Northridge earthquake[J].Earthq Spect,11(4):515-525.
Dimitriu P,Kalogeras I,Theodulidis N.1999.Evidence of nonlinear site response in horizontal-to-vertical spectral ratio from near-field earthquakes[J].Soil Dyn Earthq Eng,18(6):423-435.
贾俊峰,欧进萍.2010.近断层竖向与水平向加速度反应谱比值特征[J].地震学报,32(1):41-50.Jia J F,Ou J P.2010.Vertical-to-horizontal acceleration response spectrum ratio of near-fault ground motion[J].Acta Seismologica Sinica,32(1):41-50(in Chinese).
李恒,秦小军.2010.竖向与水平向地震动加速度反应谱比特性分析[J].地震工程与工程振动,30(1):8-14.Li H,Qin X J.2010.Study on characteristics of vertical to horizontal acceleration response spectral ratio[J].Journal of Earthquake Engineering and Engineering Vibration,30(1):8-14(in Chinese).
齐娟,罗开海,杨小卫.2014.竖向地震动特性的统计分析[J].地震工程与工程振动,34(增刊1):253-260.Qi J,Luo K H,Yang X W.2014.Statistical analysis on characteristics of vertical ground motions[J].Earthquake Engineering and Engineering Dynamics,34(S1):253-260(in Chinese).
王国权.2001.921台湾集集地震的断层地面运动特征[D].北京:中国地震局地质研究所:106-108.Wang G Q.2001.The Characteristics of Near Fault Ground Motion Caused by the 1999 Chi-Chi,Taiwan,Earthquake[D].Beijing:Institute of Geology,China Seismological Bureau:106-108(in Chinese).
谢俊举,温增平,高孟潭,胡聿贤,何少林.2010.2008年汶川地震近断层竖向与水平向地震动特征[J].地球物理学报,53(8):1796-1805.Xie J J,Wen Z P,Gao M T,Hu Y X,He S L.2010.Characteristics of near-fault vertical and horizontal ground motion from the 2008 Wenchuan earthquake[J].Chinese Journal of Geophysics,53(8):1796-1805(in Chinese).
徐龙军,谢礼立.2007.竖向地震动加速度反应谱特性[J].地震工程与工程振动,27(6):17-23.Xu L J,Xie L L.2007.Characteristics of acceleration response spectra for vertical ground motions[J].Journal of Earthquake Engineering and Engineering Vibration,27(6):17-23(in Chinese).
赵培培.2017.设计反应谱拟合方法研究及特征参数统计[D].哈尔滨:中国地震局工程力学研究所:20-22.Zhao P P.2017.Statistics of Characteristic Parameters and Research on Fitting Method of Design Response Spectrum[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration:20-22(in Chinese).
赵培培,王振宇,薄景山,张建毅.2017.川滇甘陕地区设计反应谱特征周期的统计分析[J].世界地震工程,33(2):97-104.Zhao P P,Wang Z Y,Bo J S,Zhang J Y.2017.Statistical analysis of characteristic periods of design response spectra in Sichuan,Yunnan,Gansu and Shaanxi[J].World Earthquake Engineering,33(2):97-104(in Chinese).
中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.2010.GB50011-2010:建筑抗震设计规范[S].北京:中国建筑工业出版社:20-41.Ministry of Housing and Urban-Rural Development of the People’s Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People’s Republic of China.2010.GB50011-2010:Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press:20-41(in Chinese).
周正华,周雍年,卢滔,杨程.2003.竖向地震动特征研究[J].地震工程与工程振动,23(3):25-29.Zhou Z H,Zhou Y N,Lu T,Yang C.2003.Study on characteristics of vertical ground motion[J].Earthquake Engineering and Engineering Vibration,23(3):25-29(in Chinese).
周正华,林淋,王玉石,王伟.2007.竖向地震动反应谱[J].防灾减灾工程学报,27(增刊):33-36.Zhou Z H,Lin L,Wang Y S,Wang W.2007.The response spectrum of vertical ground motion[J].Journal of Disaster Prevention and Mitigation,27(S):33-36(in Chinese).
Ambraseys N N,Douglas J.2003.Near-field horizontal and vertical earthquake ground motions[J].Soil Dyn Earthq Eng,23(1):1-18.
Bozorgnia Y,Niazi M.1995.Characteristics of free-field vertical ground motion during the Northridge earthquake[J].Earthq Spect,11(4):515-525.
Dimitriu P,Kalogeras I,Theodulidis N.1999.Evidence of nonlinear site response in horizontal-to-vertical spectral ratio from near-field earthquakes[J].Soil Dyn Earthq Eng,18(6):423-435.
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