土非线性参数变异性对标准设计谱的影响
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摘要
岩土工程中存在许多不确定性,建筑物抗震规范设计中的标准设计谱实际代表着一种平均结果,并没有考虑到场地土体非线性参数的变异性。文中采用数值模拟的方法研究了土非线性参数变异性对标准设计谱的影响。给出了考虑土非线性参数变异性的概率设计谱。结果表明,土非线性参数变异性对标准设计谱的影响显著;粘性土和无粘性土的动剪切模量比对标准设计谱的影响决定于土非线性参数的概率水准,同时也取决于概率设计谱的频段;烈度7度、8度和9度下土体动剪切模量比变异性使标准设计谱平台最大变化50%、80%和100%,阻尼比变异性使标准设计谱平台最大变化40%、45%和60%。
Uncertainty is very common in geotechnical engineering.Standard design spectra in Code for Seismic Design of Buildings represent the average responses of various sites,without considering the variability of soil nonlinear parameters.The impact of soil nonlinear parameter variability on standard design spectra is studied by numerical simulation,and probabilistic design spectra considering soil nonlinear parameter variability are provided as well.Research results show that soil nonlinear parameter variability remarkably influences standard design spectra.In addition,it can be seen that the impact of cohesive soil dynamic modulus ratio and non-cohesive soil dynamic modulus ratio on standard design spectra is determined by soil nonlinear parameter probabilities and frequency bands of probabilistic design spectra as well.Studies also show that on sites with seismic fortification intensity 7,8 and 9,the platform of standard design spectra can be maximally changed by 50%,80% and 100% respectively due to the soil dynamic modulus ratio variability,while the platform of standard design spectra can be maximally changed by 40%,45% and 60% respectively due to soil damping ratio variability.
Uncertainty is very common in geotechnical engineering.Standard design spectra in Code for Seismic Design of Buildings represent the average responses of various sites,without considering the variability of soil nonlinear parameters.The impact of soil nonlinear parameter variability on standard design spectra is studied by numerical simulation,and probabilistic design spectra considering soil nonlinear parameter variability are provided as well.Research results show that soil nonlinear parameter variability remarkably influences standard design spectra.In addition,it can be seen that the impact of cohesive soil dynamic modulus ratio and non-cohesive soil dynamic modulus ratio on standard design spectra is determined by soil nonlinear parameter probabilities and frequency bands of probabilistic design spectra as well.Studies also show that on sites with seismic fortification intensity 7,8 and 9,the platform of standard design spectra can be maximally changed by 50%,80% and 100% respectively due to the soil dynamic modulus ratio variability,while the platform of standard design spectra can be maximally changed by 40%,45% and 60% respectively due to soil damping ratio variability.
引文
[1]胡聿贤.地震安全性评价技术教程[M].北京:地震工程出版社,1999.
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[4]Li Tian,Li Jie.Influence of random mechanical parameter on earthquake response analysis of site[C].Tenth World Conference on EarthquakeEngineering Research Collection,1992.
[5]Krawinker H,Rahnama M.Effects of soft soils on design spectra[C].Tenth World Conference on Earthquake Engineering Research Collection,1992.
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[8]陈国兴,刘雪珠,王炳辉.土动力参数变异性对深软场地地表地震动参数的影响[J].防灾减灾工程学报,2007,27(1):1-10.
[9]陈国兴,王炳辉,刘建达.新近沉积土的动剪切模量和阻尼比试验研究[J].地下空间与工程学报,2008,4(3):539-543.
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[11]周锡元,苏经宇.烈度、震中距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1983,3(2):31-43.
[12]周雍年.震级、震中距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1984,4(4):14-21.
[13]Katayama T,Iwasaki T,Saeki M.Statistical analysis of earthquake accerleration response spectra[J].Proc.JSCE,1978,275.
[14]Kuribayashi E,et al.Effects of seismic and subsoil conditions on earthquake response spectra[C].Proc.Int.conf.on Microzonation,1972.
[15]袁晓铭,孙锐,陈红娟.不同概论水准下动剪切模量比与阻尼比上下限的计算[J].岩石力学与工程学报(待发表).
[2]Steven L.Kramer.Geotechnical Earthquake Engineering[M].Prentice-Hall,1996.
[3]Ikemoto,Masaru Kitaura,Masato Tsurugi.Seismic response analysis of layered ground considering uncertainty of soil parameters[C].TenthWorld Conference on Earthquake Engineering Research Collection,1992.
[4]Li Tian,Li Jie.Influence of random mechanical parameter on earthquake response analysis of site[C].Tenth World Conference on EarthquakeEngineering Research Collection,1992.
[5]Krawinker H,Rahnama M.Effects of soft soils on design spectra[C].Tenth World Conference on Earthquake Engineering Research Collection,1992.
[6]李小军,彭青.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,2001,21(3):29-36.
[7]李小军,彭青,等.设计地震动参数确定中的场地影响考虑[J].世界地震工程,2001,17(4):34-41.
[8]陈国兴,刘雪珠,王炳辉.土动力参数变异性对深软场地地表地震动参数的影响[J].防灾减灾工程学报,2007,27(1):1-10.
[9]陈国兴,王炳辉,刘建达.新近沉积土的动剪切模量和阻尼比试验研究[J].地下空间与工程学报,2008,4(3):539-543.
[10]R-MAREK A,et al.A geotechnical seismic site response evaluation procedure[C].Twelfth World Conference on Earthquake Engineering Re-search Collection,v.7:Geotechnical Engineering.
[11]周锡元,苏经宇.烈度、震中距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1983,3(2):31-43.
[12]周雍年.震级、震中距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1984,4(4):14-21.
[13]Katayama T,Iwasaki T,Saeki M.Statistical analysis of earthquake accerleration response spectra[J].Proc.JSCE,1978,275.
[14]Kuribayashi E,et al.Effects of seismic and subsoil conditions on earthquake response spectra[C].Proc.Int.conf.on Microzonation,1972.
[15]袁晓铭,孙锐,陈红娟.不同概论水准下动剪切模量比与阻尼比上下限的计算[J].岩石力学与工程学报(待发表).
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