考虑高阶振型的工程地震动选取方法
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摘要
抗震时程分析首先要确定地震动输入,合理的地震动输入是保证设计结果准确可靠的必要条件。提出考虑多阶振型影响的工程地震动选取方法,即计算单条地震动输入下,结构主要周期点处的加速度反应谱值;将各加速度反应谱值与反映场地特性的设计反应谱值的偏差,按各周期所对应的振型质量参与系数加权平均;控制加权平均偏差值即可选取出满足要求的工程地震动。以某高层办公楼为例验证了该方法的有效性。
The determination of ground motion is the first step in seismic time history analysis,thus reasonable ground motion is necessary to ensure the accuracy and reliability of analytical results. A method of engineering ground motion selection that considers the effect of higher modes is proposed in this paper. The deviations between the ground motion acceleration response spectrum and design acceleration response spectrum at the principal structural periods are calculated. Weighted deviation,i. e.,the deviations multiplied by weighting factors which correspond to the modal mass participation factors,is obtained. Then,the aimed ground motion is selected under the control of the weighted deviation. The effectiveness of this method is verified in the case of a high office building.
The determination of ground motion is the first step in seismic time history analysis,thus reasonable ground motion is necessary to ensure the accuracy and reliability of analytical results. A method of engineering ground motion selection that considers the effect of higher modes is proposed in this paper. The deviations between the ground motion acceleration response spectrum and design acceleration response spectrum at the principal structural periods are calculated. Weighted deviation,i. e.,the deviations multiplied by weighting factors which correspond to the modal mass participation factors,is obtained. Then,the aimed ground motion is selected under the control of the weighted deviation. The effectiveness of this method is verified in the case of a high office building.
引文
[1]李英民,赖明,白绍良.工程结构的地震动输入问题.十二届全国结构工程学术会议.2003.LI Yingmin,LAI ming,BAI Shaoliang.Problems of engineering ground motion selection.The 12th National Conference on Structural Engineering.2003.(in Chinese)
[2]周颖,洪磊.地震动选取方法对超高层结构抗震性能的影响[J].地震工程与工程振动,2013,33(2):60-67.ZHOU Ying,HONG Lei.The effect of ground motion selections on seismic performance of a super-tall structure[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(2):60-67.(in Chinese)
[3]Iervolino I,Allin Cornell C.Record selection for nonlinear seismic analysis of structures.Earthquake Spectra,21,685-713.2005.
[4]Baker J W,Allin Cornell C.Spectral shape,epsilon and record selection[J].Earthquake Engineering&Structural Dynamics,2006,35(9):1077-1095.
[5]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:China Architecture&Building Press,2010.(in Chinese)
[6]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2010.JGJ 3—2010 Technical specification for concrete structures of tall building[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[7]沈飞,楼梦麟.超高层建筑地震反应中高阶振型影响分析[J].工程力学,2012,29(A01):23-28.SHEN Fei,LOU Menglin.Influence of high modes of super high-rise building on its seismic responses.[J].Journal of Engineering Mechanics,2012,29(A01):23-28.(in Chinese)
[8]Groundmotion database of pacific earthquake engineering research center.http://peer.berkeley.edu/peer_ground_motion_database/site
[2]周颖,洪磊.地震动选取方法对超高层结构抗震性能的影响[J].地震工程与工程振动,2013,33(2):60-67.ZHOU Ying,HONG Lei.The effect of ground motion selections on seismic performance of a super-tall structure[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(2):60-67.(in Chinese)
[3]Iervolino I,Allin Cornell C.Record selection for nonlinear seismic analysis of structures.Earthquake Spectra,21,685-713.2005.
[4]Baker J W,Allin Cornell C.Spectral shape,epsilon and record selection[J].Earthquake Engineering&Structural Dynamics,2006,35(9):1077-1095.
[5]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:China Architecture&Building Press,2010.(in Chinese)
[6]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2010.JGJ 3—2010 Technical specification for concrete structures of tall building[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[7]沈飞,楼梦麟.超高层建筑地震反应中高阶振型影响分析[J].工程力学,2012,29(A01):23-28.SHEN Fei,LOU Menglin.Influence of high modes of super high-rise building on its seismic responses.[J].Journal of Engineering Mechanics,2012,29(A01):23-28.(in Chinese)
[8]Groundmotion database of pacific earthquake engineering research center.http://peer.berkeley.edu/peer_ground_motion_database/site
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