中等强度地震下季冻区场地响应
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摘要
《建筑抗震设计规范》(GB50 011—2010)将工程场地分为四类。目前的抗震设计工作还缺乏针对每类场地的季冻区反应谱分析。设计时只对夏季反应谱进行了计算,缺乏对冬季含冻土场地的数据验算。冻土场地地表响应计算参数多为定性分析,大部分缺乏工程实测数据,同时计算采用的模型缺乏通用性。针对不同类别的场地与不同冻土深度和多种剪切波速组合的工况进行计算,得到了季冻区场地在中等强度地震下的地表反应谱。笔者认为:在一、二类场地中的场地较薄、波速较高的情况下,冬季发生冰冻的反应谱峰值要明显大于夏季未冰冻的反应谱峰值,需要对含冻土的反应谱进行单独计算。三、四类场地中,冬季和夏季反应谱重合,不需要进行单独计算。
The Seismic Design Code(GB50 011-2010) sets four classifications of sites.At the same time the anti-seismic design is mainly based on the conventional mud,neglecting the impact of the permafrost.The parameters for calculating the response of the seasonal frozen ground are based on qualitative analysis which is lack of measured data.The models lack versatility.In accordance with the analogy of different sites at different depths of frozen soil and permafrost shear-wave velocities,the ground response spectra of seasonal frozen sites under moderate intensity earthquake are calculated.It is suggested that in the first and second class sites,in which the shear-wave velocity are higher and the soil depth are thinner,the peak of winter spectra are higher than thaose in summer.Thus,the response spectra in winter should be analyzed.In the third and fourth class sites,there is no need to calculate the spectra influenced by the permafrost.
The Seismic Design Code(GB50 011-2010) sets four classifications of sites.At the same time the anti-seismic design is mainly based on the conventional mud,neglecting the impact of the permafrost.The parameters for calculating the response of the seasonal frozen ground are based on qualitative analysis which is lack of measured data.The models lack versatility.In accordance with the analogy of different sites at different depths of frozen soil and permafrost shear-wave velocities,the ground response spectra of seasonal frozen sites under moderate intensity earthquake are calculated.It is suggested that in the first and second class sites,in which the shear-wave velocity are higher and the soil depth are thinner,the peak of winter spectra are higher than thaose in summer.Thus,the response spectra in winter should be analyzed.In the third and fourth class sites,there is no need to calculate the spectra influenced by the permafrost.
引文
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[5]HASHASH Y,PARK D.Viscous damping formulation andhigh frequency motion propagation in non-linear siteresponse analysis[J].Soil Dynamics and EarthquakeEngineering,2002,22:611-624.
[6]DUTTA U,YANG Z,XU G,et al.Effect of Seasonally FrozenSoil and Permafrost on Seismic Site Response[C]//The 14thWorld Conference on Earthquake Engineering,Beijing.2008.
[7]MURAVSKII G B.Application of experimental results oncyclic deforming of soils to seismic response analysis[J].SoilDynamics and Earthquake Engineering,2001,21:661-669.
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[10]廖振鹏,李小军.地表土层地震反应的等效线性化解法[C]//地震小区划(理论与实践).北京:地震出版社,1989:141-153.(LIAO Zhen-peng,LI Xiao-jun.Equivalentlinearization method for solving the seismic response of thesurface soil[C]//Seismic Microzonation(Theory and Pratice).Beijing:Earthquake Publishing House,1989:141-153.(inChinese))
[11]李小军.一维土层地震反应线性化计算程序[C]//地震小区划(理论与实践).北京:地震出版社,1989:250-265.(LIXiao-jun.The soil seismic response of one-dimensional linearcalculation program[C]//Seismic Microzonation(Theory andPratice).Beijing.Earthquake Publishing House,1989:250-265.(in Chinese))
[12]齐文浩,薄景山,张忠利.土层地震反应分析的研究现状[J].世界地震工程,2010,26(增刊):368-372.(QI Wen-hao,BO Jing-shan,ZHANG Zhong-li,Present research of the soilseismic response analysis[J].World Earthquake Engineering,2010,26(S0):368-372.(in Chinese))
[13]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.(QI Wen-hao,BOJing-shan,Methods of soil seismic response equivalentlinearization[J].World Earthquake Engineering,2007,23(4):221-226.(in Chinese))
[14]胡聿贤.地震工程学[M].北京:地震出版社,1988:218-249.(HU Yu-xian,Earthquake engineering[C]//Beijing.Earthquake Publishing House,1988:218-249.(in Chinese))
[15]GB50011—2010建筑抗震设计规范[M].2010:15-40.(GB50011—2010 Seismic design code[M].2010:15-40.(inChinese))
[2]AL-HUNAIDIM O A,CHEN P A,RAINER J H,et al.Shearmodule and damping in frozen and unfrozen clay by resonantcolumn tests[J].Can Geo-tech J,1996,333:510-514.
[3]汪恩良,孙景路,高占坤,等.哈尔滨地区季节冻深理论公式修正系数的确定[C]//Recent Development of Research onPermafrost Engineering and Cold Region EnvironmentProceedings of the Eighth International Symposium onPermafrost Engineering.北京:中国建筑工业出版社,2009:338-343.(WANG En-liang,SUN Jing-lu,GAO Zhan-kun,et al.The determining of theoretical formula correctionfactors of seasonal frozen depth in Harbin[C]//RecentDevelopment of Research on Permafrost Engineering andCold Region Environment Proceedings of the EighthInternational Symposium on Permafrost Engineering.Beijing.China.Building Industry Publishing House.2009:338-343.China Architecture&Building Press.(in Chinese))
[4]JESSBERGER H L.State of the airport ground freezingmechanical properties,processes and design[J].EngineeringGeology,1981,18(1/2/3/4):5-30.
[5]HASHASH Y,PARK D.Viscous damping formulation andhigh frequency motion propagation in non-linear siteresponse analysis[J].Soil Dynamics and EarthquakeEngineering,2002,22:611-624.
[6]DUTTA U,YANG Z,XU G,et al.Effect of Seasonally FrozenSoil and Permafrost on Seismic Site Response[C]//The 14thWorld Conference on Earthquake Engineering,Beijing.2008.
[7]MURAVSKII G B.Application of experimental results oncyclic deforming of soils to seismic response analysis[J].SoilDynamics and Earthquake Engineering,2001,21:661-669.
[8]SIMONSEN E,JANOO V,ISACSSON U.Resilient propertiesof unbound road materials during seasonal frost conditions[J].Journal of Cold Regions Engineering,ASCE,2002,16(1):28-50.
[9]王丽霞,凌贤长,徐学燕.多年冻土场地路基地震加速度反应谱特性研究[J].岩石力学与工程学报,2004,23(8):59-68.(WANG Li-xia,LING Xian-zhang,XU Xue-yan.Theresearch on the earthquake acceleration response spectrumcharacteristics of permafrost roadbed[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(8):59-68.(inChinese))
[10]廖振鹏,李小军.地表土层地震反应的等效线性化解法[C]//地震小区划(理论与实践).北京:地震出版社,1989:141-153.(LIAO Zhen-peng,LI Xiao-jun.Equivalentlinearization method for solving the seismic response of thesurface soil[C]//Seismic Microzonation(Theory and Pratice).Beijing:Earthquake Publishing House,1989:141-153.(inChinese))
[11]李小军.一维土层地震反应线性化计算程序[C]//地震小区划(理论与实践).北京:地震出版社,1989:250-265.(LIXiao-jun.The soil seismic response of one-dimensional linearcalculation program[C]//Seismic Microzonation(Theory andPratice).Beijing.Earthquake Publishing House,1989:250-265.(in Chinese))
[12]齐文浩,薄景山,张忠利.土层地震反应分析的研究现状[J].世界地震工程,2010,26(增刊):368-372.(QI Wen-hao,BO Jing-shan,ZHANG Zhong-li,Present research of the soilseismic response analysis[J].World Earthquake Engineering,2010,26(S0):368-372.(in Chinese))
[13]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.(QI Wen-hao,BOJing-shan,Methods of soil seismic response equivalentlinearization[J].World Earthquake Engineering,2007,23(4):221-226.(in Chinese))
[14]胡聿贤.地震工程学[M].北京:地震出版社,1988:218-249.(HU Yu-xian,Earthquake engineering[C]//Beijing.Earthquake Publishing House,1988:218-249.(in Chinese))
[15]GB50011—2010建筑抗震设计规范[M].2010:15-40.(GB50011—2010 Seismic design code[M].2010:15-40.(inChinese))
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