中硬场地概率反应谱研究
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摘要
现代反应谱是以平均值作为设防水准的,但缺乏统一的概率保证,需要从概率意义上研究反应谱。搜集了中硬场地上反映最新地震活动情况的205条地震记录,建立了不同区间—周期下的三维分布概率图,发现概率图中反应谱与均值谱的比值难以集中在平均值附近,以均值确认反应谱的设防水准是不合理的。因此,建立了三维累计概率图,求得不同概率保证率下的反应谱;最后拟合8度设防水准下,不同概率保证的地震影响系数和周期之间的函数关系式。
Modern response spectrum takes the mean value as fortification level,but it lacks of unified probability guarantee,and needs studying response spectrum based on the probability.This paper collects two hundred and five earthquake records for the medium-hard site,which reflact the latest earthquake activities,and the three-dimensional distributed probability charts of different interval and period are set up.It is found that the radio of response spectrum and mean spectrum is difficult to be centralized around the average,it is not very reasonable to use the mean value to identify response spectrum fortification level.Thus,this paper establishes three-dimensional cumulative probability charts,and obtains response spectrum under different probability guarantee rate.Finally,this paper fits the functional relationship between the earthquake influence coefficient guaranteed by different probability and period under the minimum fortification level of eight.
Modern response spectrum takes the mean value as fortification level,but it lacks of unified probability guarantee,and needs studying response spectrum based on the probability.This paper collects two hundred and five earthquake records for the medium-hard site,which reflact the latest earthquake activities,and the three-dimensional distributed probability charts of different interval and period are set up.It is found that the radio of response spectrum and mean spectrum is difficult to be centralized around the average,it is not very reasonable to use the mean value to identify response spectrum fortification level.Thus,this paper establishes three-dimensional cumulative probability charts,and obtains response spectrum under different probability guarantee rate.Finally,this paper fits the functional relationship between the earthquake influence coefficient guaranteed by different probability and period under the minimum fortification level of eight.
引文
[1]王前信,等.弹塑性反应谱.地震工程研究报告集[R].第二集.北京:科学出版社,1978.
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[3]Chen Dan.Ductility Spectra and Collapse Spectra for EarthquakeResistant Structures.Proc:7thEuropean Conference on Earth-quake Engineering[R],1982.
[4]丁建国.弹塑性反应谱及其在抗震设计中的应用[J].南京理工大学学报,2007,31(6):780-783.
[5]肖明奎,严涛,王耀伟.弹塑性反应谱研究综述.重庆大学学报,1999,21(5):117-121.
[6]Chopra AK,Goel R K.Evaluation of NSP to estimate seismic de-formation:SDF systems[J].Journal of Structural Engineering,2000,126(4):428-490.
[7]BSSC.2003 Edition NEHRP Recommended Provisions for theDevelopment of Seismic Regulations for New Buildings[S].FE-MA450,2003.
[8]GB 50011-2001建筑抗震设计规范[S].
[2]陈聃.抗震结构的延性谱.清华大学抗震抗爆工程研究报告集[R].清华大学出版社,1980.
[3]Chen Dan.Ductility Spectra and Collapse Spectra for EarthquakeResistant Structures.Proc:7thEuropean Conference on Earth-quake Engineering[R],1982.
[4]丁建国.弹塑性反应谱及其在抗震设计中的应用[J].南京理工大学学报,2007,31(6):780-783.
[5]肖明奎,严涛,王耀伟.弹塑性反应谱研究综述.重庆大学学报,1999,21(5):117-121.
[6]Chopra AK,Goel R K.Evaluation of NSP to estimate seismic de-formation:SDF systems[J].Journal of Structural Engineering,2000,126(4):428-490.
[7]BSSC.2003 Edition NEHRP Recommended Provisions for theDevelopment of Seismic Regulations for New Buildings[S].FE-MA450,2003.
[8]GB 50011-2001建筑抗震设计规范[S].
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