苏州城区场地等效剪切波速计算深度取值探讨
|
摘要
鉴于场地等效剪切波速的计算深度是否需要由地表以下20 m增至30 m的争论尚未有定论,依据苏州城区场地143组实测剪切波速资料的统计分析,对GB50011-2010《建筑抗震设计规范》场地类别分类标准与欧美抗震设计规范场地分类标准进行了对比,比较了苏州城区场地等效剪切波速计算深度取为20 m和30 m的差异性,结果表明:苏州城区场地剪切波速在地表以下20～60m范围的变异性较大,采用分段函数描述剪切波速随土层深度的变化关系是合适的;III类场地等效剪切波速大小的分布偏向III类场地类别的下界限值,当计算深度由20 m增至30 m时,场地等效剪切波速的均值增大16%,如果直接沿用欧美规范的场地分类界限值,将会整体提高苏州城区场地类别的划分标准,苏州城区III类和Ⅳ类场地的等效剪切波速分界值取为170 m/s是适宜的。
In view of the question whether or not increasing the soil depth from 20m to 30m in calculating equivalent shear wave velocity for site classification is controversial,shear wave velocity data of 143 drilling holes from urban area of Suzhou are analyzed.By comparing site classification standards between GB50011-2010 code for seismic design of buildings and American and European seismic regulations,the differences of equivalent shear wave velocity calculated with the depth of 20 m and 30 m are discussed.The results show that shear wave velocity has much higher variability for soil depth of 20~60 m,the relationship between shear wave velocity and soil depth is fitting with piecewise linear function and power function.The sample values of equivalent shear wave velocity for site class III is more close to the lower boundary value of site class III.When the calculation depth increases from 20m to 30m,the mean values of equivalent shear wave velocity for the site class III will increase 16%.Following the boundary values of site classification of American and European seismic regulation will improve classification standard for the sites in urban area of Suzhou integrally.If the calculation depth is increased to 30 m,it would be more appropriate to use 170 m/s as the boundary value of the site class III and site class Ⅳ.
In view of the question whether or not increasing the soil depth from 20m to 30m in calculating equivalent shear wave velocity for site classification is controversial,shear wave velocity data of 143 drilling holes from urban area of Suzhou are analyzed.By comparing site classification standards between GB50011-2010 code for seismic design of buildings and American and European seismic regulations,the differences of equivalent shear wave velocity calculated with the depth of 20 m and 30 m are discussed.The results show that shear wave velocity has much higher variability for soil depth of 20~60 m,the relationship between shear wave velocity and soil depth is fitting with piecewise linear function and power function.The sample values of equivalent shear wave velocity for site class III is more close to the lower boundary value of site class III.When the calculation depth increases from 20m to 30m,the mean values of equivalent shear wave velocity for the site class III will increase 16%.Following the boundary values of site classification of American and European seismic regulation will improve classification standard for the sites in urban area of Suzhou integrally.If the calculation depth is increased to 30 m,it would be more appropriate to use 170 m/s as the boundary value of the site class III and site class Ⅳ.
引文
[1]GB50011-2010建筑抗震设计规范[S].北京:中国建筑出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
[2]IBC 2000.International Building Code[S].CA,International Code Council,2006.
[3]FEMA 450 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures[S].Washington,D.C.,Council BS S,2004.
[4]Eurocode 8 Design of Structures for Earthquake Resistance Part 1:General Rules,Seismic Actions and Rules for Buildings[S].Landon,Stand-ardization E C F,2004.
[5]罗开海,王亚勇.中美欧抗震设计规范地震动参数换算关系的研究[J].建筑结构,2006,36(8):103-107.LUO Kaihai,WANG Yayong.Research on conversion relationships among the parameters of ground motions in seismic design codes of China,Amer-ica and Europe[J].Journal of Building Structures,2006,36(8):103-107.(in Chinese)
[6]黄雅虹,吕悦军,彭艳菊.国内外不同抗震设计规范中场地分类方法的内在关系研究[J].震灾防御技术,2009,4(1):80-90.HUANG Yahong,LU Yuejun,PENG Yanju.Study on the relations of site classification methods in seismic design standards between China and a-broad[J].Technology for Earthquake Disaster Prevention,2009,4(1):80-90.(in Chinese)
[7]郭锋,吴东明,许国富,等.中外抗震设计规范场地分类对应关系[J].土木工程与管理学报,2011,28(2):63-66.GUO Feng,WU Dongming,XU Guofu,et al.Site classification corresponding relationship between Chinese and the overseas seismic design codes[J].Journal of Civil Engineering and Management,2011,28(2):63-66.(in Chinese)
[8]Anderson J,Lee Y,Zeng Y,et al.Control of strong motion by the upper 30 meters[J].Bulletin of the Seismo-logical Society of America,1996,86(6):1749-1759.
[9]战吉艳,陈国兴,刘建达.苏州城区深软场地土剪切波速与土层深度的经验关系[J].世界地震工程,2009,25(2):11-17.ZHAN Jiyan,CHEN Guoxing,LIU Jianda.Empirical relationship between shear wave velocity and soil depth on deep soft sites in urban area ofSuzhou City[J].World Earthquake Engineering,2009,25(2):11-17.(in Chinese)
[10]黄雅虹,吕悦军,兰景岩,等.工程场地分类中等效剪切波速计算深度问题的讨论[J].地震地质,2010,32(2):312-319.HUANG Yahong,LYuejun,LAN Jingyan,et al.Discussion on the issue of proper depth in calculating equivalent shear wave velocity for site clas-sification[J].Seismology and Geology,2010,32(2):312-319.(in Chinese)
[2]IBC 2000.International Building Code[S].CA,International Code Council,2006.
[3]FEMA 450 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures[S].Washington,D.C.,Council BS S,2004.
[4]Eurocode 8 Design of Structures for Earthquake Resistance Part 1:General Rules,Seismic Actions and Rules for Buildings[S].Landon,Stand-ardization E C F,2004.
[5]罗开海,王亚勇.中美欧抗震设计规范地震动参数换算关系的研究[J].建筑结构,2006,36(8):103-107.LUO Kaihai,WANG Yayong.Research on conversion relationships among the parameters of ground motions in seismic design codes of China,Amer-ica and Europe[J].Journal of Building Structures,2006,36(8):103-107.(in Chinese)
[6]黄雅虹,吕悦军,彭艳菊.国内外不同抗震设计规范中场地分类方法的内在关系研究[J].震灾防御技术,2009,4(1):80-90.HUANG Yahong,LU Yuejun,PENG Yanju.Study on the relations of site classification methods in seismic design standards between China and a-broad[J].Technology for Earthquake Disaster Prevention,2009,4(1):80-90.(in Chinese)
[7]郭锋,吴东明,许国富,等.中外抗震设计规范场地分类对应关系[J].土木工程与管理学报,2011,28(2):63-66.GUO Feng,WU Dongming,XU Guofu,et al.Site classification corresponding relationship between Chinese and the overseas seismic design codes[J].Journal of Civil Engineering and Management,2011,28(2):63-66.(in Chinese)
[8]Anderson J,Lee Y,Zeng Y,et al.Control of strong motion by the upper 30 meters[J].Bulletin of the Seismo-logical Society of America,1996,86(6):1749-1759.
[9]战吉艳,陈国兴,刘建达.苏州城区深软场地土剪切波速与土层深度的经验关系[J].世界地震工程,2009,25(2):11-17.ZHAN Jiyan,CHEN Guoxing,LIU Jianda.Empirical relationship between shear wave velocity and soil depth on deep soft sites in urban area ofSuzhou City[J].World Earthquake Engineering,2009,25(2):11-17.(in Chinese)
[10]黄雅虹,吕悦军,兰景岩,等.工程场地分类中等效剪切波速计算深度问题的讨论[J].地震地质,2010,32(2):312-319.HUANG Yahong,LYuejun,LAN Jingyan,et al.Discussion on the issue of proper depth in calculating equivalent shear wave velocity for site clas-sification[J].Seismology and Geology,2010,32(2):312-319.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心