软土场地概率地震反应谱的研究
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摘要
目前反应谱都是以平均谱值作为设防水准,无法明确设防水准上的概率水平.选取软土场地上的368条地震记录进行分析,建立了关于周期、变化区间和分布概率的三维分布概率图,发现各条地震反应谱值与平均谱值的比值难以集中在1附近,说明平均谱值反应谱不能体现统一的设防水准.因此建立了三维的累积概率分布图,求得不同概率保证率下的反应谱.最后还拟合出规定设防水准的反应谱和周期之间的关系表达式.
Currently,the average value of seismic response spectrum is taken as the fortification level,however,the probability of earthquake fortification level can not be clearly defined.The 368 seismic records of the soft soil site are analysed in the paper and the three-dimensional distributive probability plots of periods,variety intervals and distributive probability are established.It is shown that the ratio between every seismic response spectrum value and the average value are not around 1.So,the mean response spectrum can't reflect the unified fortification level.Thus,the three-dimensional cumulative probability plots are established and the response spectrum with different probability reliability can be obtained.Finally,the spectrum's expression between the provided fortification level and period is fitted.
Currently,the average value of seismic response spectrum is taken as the fortification level,however,the probability of earthquake fortification level can not be clearly defined.The 368 seismic records of the soft soil site are analysed in the paper and the three-dimensional distributive probability plots of periods,variety intervals and distributive probability are established.It is shown that the ratio between every seismic response spectrum value and the average value are not around 1.So,the mean response spectrum can't reflect the unified fortification level.Thus,the three-dimensional cumulative probability plots are established and the response spectrum with different probability reliability can be obtained.Finally,the spectrum's expression between the provided fortification level and period is fitted.
引文
[1]邓自宇,熊立红,章亮.反应谱理论及应用[J].天津城市建设学院学报,2008,14(4):244-247.DENG Zi-yu,XIONG Li-hong,ZHANG Liang.Response Spectrum Theory and Its Application[J].Journal of Tianjin Insititute of Ur-ban Construction,2008,14(4):244-247.
[2]Biot M A.A Mechanical Analyzer for Prediction of Earthquake Stress[J].Bull Seism Soc Am,1941,31(1):151-171.
[3]Housner G W.Calculating the Response of an Oscillator to Arbitrary Ground Motion[J].Bull Seism Soc Am,1941,31(2):143-149.
[4]Newmark N M,Hall W J.Earthquake Spectra and Design[M].California:EERI Berkeley,1982.
[5]易伟建,张海燕.弹塑性反应谱的比较及其应用[J].湖南大学学报,2005,32(2):42-45.YI Wei-jian,ZHANG Hai-yan.Comparison and Application of Elastic-Plastic Respon Spectra[J].Journal of Hunan University,2005,32(2):42-45.
[6]刘哲锋,沈蒲生.地震动输入能量谱的研究[J].工程抗震与加固改造,2006,28(4):1-5.LIU Zhe-feng,SHEN Pu-sheng.Study on Input Energy Spectura of Earhquake Strong Motion[J].Earhquake Resistant Engineeringand Retrofitting,2006,28(4):1-5.
[7]肖明葵,严涛,王耀伟,等.弹塑性反应谱研究综述[J].重庆建筑大学学报,1999,21(5):117-121.XIAO Ming-kui,YAN Tao,WANG Yao-wei,et al.A Review and Analysis of Seismic Response Spectra of Elastic-Plastic Structures[J].Journal of Chongqing Jianzhu University,1999,21(5):117-121.
[8]沈建文,石树中.一致概率谱与规范谱[J].地震学报,2004,26(1):94-101.SHEN Jian-wen,SHI Shu-zhong.Probability-Consistent Spectrum and Code[J].Spectrum Acta Seismologica Sinica,2004,26(1):94-101.
[9]BSSC.2003Edition NEHRP Recommended Provisions for the Development of Seismic Regulations for New Buildings[S].FEMA450,2003.
[10]GB50011—2010,建筑抗震设计规范[S].GB50011—2010,Code for Seismic Design of Biuldings[S].
[2]Biot M A.A Mechanical Analyzer for Prediction of Earthquake Stress[J].Bull Seism Soc Am,1941,31(1):151-171.
[3]Housner G W.Calculating the Response of an Oscillator to Arbitrary Ground Motion[J].Bull Seism Soc Am,1941,31(2):143-149.
[4]Newmark N M,Hall W J.Earthquake Spectra and Design[M].California:EERI Berkeley,1982.
[5]易伟建,张海燕.弹塑性反应谱的比较及其应用[J].湖南大学学报,2005,32(2):42-45.YI Wei-jian,ZHANG Hai-yan.Comparison and Application of Elastic-Plastic Respon Spectra[J].Journal of Hunan University,2005,32(2):42-45.
[6]刘哲锋,沈蒲生.地震动输入能量谱的研究[J].工程抗震与加固改造,2006,28(4):1-5.LIU Zhe-feng,SHEN Pu-sheng.Study on Input Energy Spectura of Earhquake Strong Motion[J].Earhquake Resistant Engineeringand Retrofitting,2006,28(4):1-5.
[7]肖明葵,严涛,王耀伟,等.弹塑性反应谱研究综述[J].重庆建筑大学学报,1999,21(5):117-121.XIAO Ming-kui,YAN Tao,WANG Yao-wei,et al.A Review and Analysis of Seismic Response Spectra of Elastic-Plastic Structures[J].Journal of Chongqing Jianzhu University,1999,21(5):117-121.
[8]沈建文,石树中.一致概率谱与规范谱[J].地震学报,2004,26(1):94-101.SHEN Jian-wen,SHI Shu-zhong.Probability-Consistent Spectrum and Code[J].Spectrum Acta Seismologica Sinica,2004,26(1):94-101.
[9]BSSC.2003Edition NEHRP Recommended Provisions for the Development of Seismic Regulations for New Buildings[S].FEMA450,2003.
[10]GB50011—2010,建筑抗震设计规范[S].GB50011—2010,Code for Seismic Design of Biuldings[S].
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