软弱土层对中欧场地划分影响的比较
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摘要
针对场地中存在软弱土层的多种情况,对中、欧场地划分的差异进行比较。通过对一般场地、20 m深度范围内含软弱夹层场地、20 m深度以下含软弱土层场地的剪切波速的计算,依据中国设计规范GB50011—2001、欧洲设计规范Eurocode 8分别进行场地划分。通过比较分析发现,Eurocode 8的场地分类对20 m深度范围内软弱夹层厚度的反应比GB 50011—2001更敏感,对20 m深度以下软弱土层厚度的考虑比GB 50011—2001更细致,建议中国抗震规范应进一步考虑软弱土层的影响,且将计算深度由20 m进一步向下延伸。
For several sites with soft soil layer,the difference of site classification between Chinese code GB 50011—2001 and European code Eurocode 8 is studied in this paper.Firstly,the shear wave velocity of ordinary site,site with soft interlayer within 20 m depth,site with soft soil layer below 20 m depth is computed,and the site classification is classified according to GB 50011—2001 and Eurocode 8 respectively.Then,the comparative analysis is carried out,it is found that the thickness of soft soil layer is more vulnerable to change site classification of Eurocode 8 than that of GB 50011—2001 for site with soft interlayer within 20 m depth,which is considered more carefully in Eurocode 8 for site with soft soil layer below 20 m depth.It is suggested that the influence of soft soil layer should be further considered in China code,and the calculation depth should be further extended from 20 m.
For several sites with soft soil layer,the difference of site classification between Chinese code GB 50011—2001 and European code Eurocode 8 is studied in this paper.Firstly,the shear wave velocity of ordinary site,site with soft interlayer within 20 m depth,site with soft soil layer below 20 m depth is computed,and the site classification is classified according to GB 50011—2001 and Eurocode 8 respectively.Then,the comparative analysis is carried out,it is found that the thickness of soft soil layer is more vulnerable to change site classification of Eurocode 8 than that of GB 50011—2001 for site with soft interlayer within 20 m depth,which is considered more carefully in Eurocode 8 for site with soft soil layer below 20 m depth.It is suggested that the influence of soft soil layer should be further considered in China code,and the calculation depth should be further extended from 20 m.
引文
[1]薄景山,翟庆生,刘红帅,等.场地分类及其在我国的演变[J].自然灾害学报,2004,13(3):44-49.
[2]郭明珠,陈厚群.场地类别划分与抗震设计反应谱的讨论[J].世界地震工程,2003,19(2):108-111.
[3]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.
[4]罗开海.建筑抗震设防标准和性能设计方法研究——中美欧抗震设计规范比较分析[D].北京:中国建筑科学研究院,2005.
[5]GB 50011—2001建筑抗震设计规范[S].
[6]CEN/TC 250.Eurocode 8,Design of Structures for EarthquakeResistance[S].
[2]郭明珠,陈厚群.场地类别划分与抗震设计反应谱的讨论[J].世界地震工程,2003,19(2):108-111.
[3]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.
[4]罗开海.建筑抗震设防标准和性能设计方法研究——中美欧抗震设计规范比较分析[D].北京:中国建筑科学研究院,2005.
[5]GB 50011—2001建筑抗震设计规范[S].
[6]CEN/TC 250.Eurocode 8,Design of Structures for EarthquakeResistance[S].
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