Ⅰ建筑类场地反应谱参数取值问题探讨
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摘要
在对89、01抗震规范中Ⅰ类场地分类界限深入的探讨的基础上,利用目前地震安全性评价中广泛使用的基于一维等效线性化波动方法研究了某市沿海地区为代表的浅层覆盖土条件下的地震动参数取值问题。针对各种情况下Ⅰ类建筑场地土,构造若干具有工程意义的典型场地剖面,合成适合本地区的基底输入地震波,计算得到浅层覆盖土条件下的场地地表加速度峰值和反应谱周期。通过对几种类型土计算结果和实际操作的分析和探讨,结果表明:放大倍数谱描述结果概念更强;复核结果偏于保守,且与抗震选用参数不兼容;当钻孔足够多时,低波速钻孔标定谱形接近高波速钻孔。
In this paper,after discussingⅠ-site classification of 89 Code and 01 Code(Code for Seismic Design of Buildings GB50011-2001),the questions of response spectra values of specific soil in Yantai city are studied with software ESE and by using 1-D equivalent linearization wave method.Some representative site profiles with engineering values are selected and constructed to calculate the response spectra of different sites under suitable ground motions.Effect of soil layer construction on characteristic periods and acceleration peaks of response spectra are studied,and some valuable results are obtained:β-spectra are reasonable for describing the results;checking results are on high safe side,and are not suitable with design parameters;the β-spectra figures of low shear wave velocity in bores are similar to the high shear wave velocity in ones while samples are enough.
In this paper,after discussingⅠ-site classification of 89 Code and 01 Code(Code for Seismic Design of Buildings GB50011-2001),the questions of response spectra values of specific soil in Yantai city are studied with software ESE and by using 1-D equivalent linearization wave method.Some representative site profiles with engineering values are selected and constructed to calculate the response spectra of different sites under suitable ground motions.Effect of soil layer construction on characteristic periods and acceleration peaks of response spectra are studied,and some valuable results are obtained:β-spectra are reasonable for describing the results;checking results are on high safe side,and are not suitable with design parameters;the β-spectra figures of low shear wave velocity in bores are similar to the high shear wave velocity in ones while samples are enough.
引文
[1]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003,23(3):35-40.Bo Jingshan,Li Xiuling,Liu Hongshuai.Effects of soil layer construction on peak accelerations of ground motions[J].Journal of Earthquake Engi-neering and Engineering Vibration,2003,23(3):35-40.
[2]胡聿贤.地震工程学[M].北京:地震出版社,1988.Hu Yuxian.Earthquake Engineering[M].Beijing:Earthquake Publishing House,1988.
[3]李小军.非线性土层地震反应分析的一种方法[J].华南地震,1992,12(4):1-8.Li Xiaojun.A method for analysing seismic response of nonlinear soil layers[J].South China Journal of Seismology,1992,12(4):1-8.
[4]李小军.一维土层地震反应线性化计算程序[C]//廖振鹏主编,地震小区划—理论与实践.北京:地震出版社,1989.Li Xiaojun.Programfor1-D equivalent linear seismic responses of soil layers[C]//Earthquake Zoning-Theory and Practice,Beijing:EarthquakePublishing House,1989.
[5]廖振鹏,李小军.地表土层地震反应的线性化解法[C]//廖振鹏主编,地震小区划—理论与实践.北京,地震出版社,1989.Liao Zhenpeng,Li Xiaojun.Linear method for seismic responses of soil layers[C]//Earthquake Zoning-Theory and Practice,Beijing:EarthquakePublishing House,1989.
[6]李小军.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.Li Xiaojun.Consideration of site effects for determination of design earthquake ground motion parameters[J].World Earthquake Engineering,2001,17(4):34-41.
[7]薄景山.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.Bo Jingshan.Some progress of study on the effect of site conditions on ground motion[J].World Earthquake Engineering,2003,19(2):11-15.
[8]陈昌军.场地剪切波波速测试及其应用[J].华南地震,2003,23(4):81-86.Chen Changjun.Shear wave velocity testing of building site and its application[J].South China Journal of Seismology,2003,23(4):81-86.
[2]胡聿贤.地震工程学[M].北京:地震出版社,1988.Hu Yuxian.Earthquake Engineering[M].Beijing:Earthquake Publishing House,1988.
[3]李小军.非线性土层地震反应分析的一种方法[J].华南地震,1992,12(4):1-8.Li Xiaojun.A method for analysing seismic response of nonlinear soil layers[J].South China Journal of Seismology,1992,12(4):1-8.
[4]李小军.一维土层地震反应线性化计算程序[C]//廖振鹏主编,地震小区划—理论与实践.北京:地震出版社,1989.Li Xiaojun.Programfor1-D equivalent linear seismic responses of soil layers[C]//Earthquake Zoning-Theory and Practice,Beijing:EarthquakePublishing House,1989.
[5]廖振鹏,李小军.地表土层地震反应的线性化解法[C]//廖振鹏主编,地震小区划—理论与实践.北京,地震出版社,1989.Liao Zhenpeng,Li Xiaojun.Linear method for seismic responses of soil layers[C]//Earthquake Zoning-Theory and Practice,Beijing:EarthquakePublishing House,1989.
[6]李小军.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.Li Xiaojun.Consideration of site effects for determination of design earthquake ground motion parameters[J].World Earthquake Engineering,2001,17(4):34-41.
[7]薄景山.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.Bo Jingshan.Some progress of study on the effect of site conditions on ground motion[J].World Earthquake Engineering,2003,19(2):11-15.
[8]陈昌军.场地剪切波波速测试及其应用[J].华南地震,2003,23(4):81-86.Chen Changjun.Shear wave velocity testing of building site and its application[J].South China Journal of Seismology,2003,23(4):81-86.
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