设计加速度谱的标定
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摘要
本文用直线上升、平台和下降等三段曲线组成的谱曲线近似表示实际加速度谱曲线,谱曲线下降指数γ设为随机变量。用该模型对700多条实际加速度谱曲线逐条进行拟合分析。将所得拟合谱的特征参数建立与震级、断层距、谱下降指数和场地平均剪切波速的地震动衰减统计关系。建议参考下降指数的累积概率分布选取γ值。结果可得到各类场地类别而且下降指数有明确累积概率水平的设计加速度谱表示式。
In this paper,actual acceleration response spectral curve is approximated by the curve that is consisted of uplifted straight line,flat and descending curve. The descending indexes γ of fitting spectral curves are assumed to be stochastic variables. More than 700 actual acceleration spectral curves are simulated one by one with the model. The statistical relationship of ground motion attenuation between characteristic parameters of these fitting spectral curves and magnitude,fault distance,descending index of spectral curve,average shear wave velocity at sites can be established. The index γ is chosen according to the cumulative probability of index γ. Consequently the design acceleration spectra expression for various site types and for specific cumulative probability of γ index is derived.
In this paper,actual acceleration response spectral curve is approximated by the curve that is consisted of uplifted straight line,flat and descending curve. The descending indexes γ of fitting spectral curves are assumed to be stochastic variables. More than 700 actual acceleration spectral curves are simulated one by one with the model. The statistical relationship of ground motion attenuation between characteristic parameters of these fitting spectral curves and magnitude,fault distance,descending index of spectral curve,average shear wave velocity at sites can be established. The index γ is chosen according to the cumulative probability of index γ. Consequently the design acceleration spectra expression for various site types and for specific cumulative probability of γ index is derived.
引文
[1]周雍年,周正华,于海英.设计反应谱长周期区段的研究[J].地震工程与工程振动,2004,24(2):15-18.ZHOU Yongnian,ZHOU Zhenghua,YU Haiying.A study on long period portion of design spectra[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(2):15-18.(in Chinese)
[2]耿淑伟,陶夏新,王国新.对设计反应谱长周期段取值规定的探讨[J].地震工程与工程振动,2008,24(2):111-116.GENG Shuwei,TAO Xiaxin,WANG Guoxin.Study on the provisions for the values of design response spectra in long period section[J].Journal of Earthquake Engineering and Engineering Vibration,2008,24(2):111-116.(in Chinese)
[3]Pacific Earthquake Engineering Research Center,Peer Ground Motion Database.http://peer.berkeley.edu/peer_ground_motion_database/
[4]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Buildings[S].Beijing:Chinese National Standard,2010.(in Chinese)
[5]胡聿贤.地震安全性评价技术教程[M].北京:地震出版社,1999:299-302.HU Yuxian.Course in evaluation technology of seismic safety[M].Beijing Seismic Press,1999:299-302.(in Chinese)
[6]FEMA P-750 2009 NEHRP Recommended Seismic Provisions For New Building And Other Structures[S].Washington,D.C.:Building Seismic Safety Council,2009.
[7]BS EN 1998-1:2004 Eurocode 8:Design of Structures for Earthquake Resistance.Part 1:General rules,Seismic Actions and Rules for Buildings[S].London:British Standard Institute,2005.
[2]耿淑伟,陶夏新,王国新.对设计反应谱长周期段取值规定的探讨[J].地震工程与工程振动,2008,24(2):111-116.GENG Shuwei,TAO Xiaxin,WANG Guoxin.Study on the provisions for the values of design response spectra in long period section[J].Journal of Earthquake Engineering and Engineering Vibration,2008,24(2):111-116.(in Chinese)
[3]Pacific Earthquake Engineering Research Center,Peer Ground Motion Database.http://peer.berkeley.edu/peer_ground_motion_database/
[4]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Buildings[S].Beijing:Chinese National Standard,2010.(in Chinese)
[5]胡聿贤.地震安全性评价技术教程[M].北京:地震出版社,1999:299-302.HU Yuxian.Course in evaluation technology of seismic safety[M].Beijing Seismic Press,1999:299-302.(in Chinese)
[6]FEMA P-750 2009 NEHRP Recommended Seismic Provisions For New Building And Other Structures[S].Washington,D.C.:Building Seismic Safety Council,2009.
[7]BS EN 1998-1:2004 Eurocode 8:Design of Structures for Earthquake Resistance.Part 1:General rules,Seismic Actions and Rules for Buildings[S].London:British Standard Institute,2005.
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