高层结构非线性地震反应分析
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摘要
从国内外地震记录库中挑选出2条具有丰富长周期信息的长周期地震波,利用正交化HHT法对2条地震波进行时-频特征分析计算,同时以2条常用地震波为参照,进行时-频特征的比对分析。然后,以一实际高层结构为例,利用ANSYS有限元软件建立有限元数值模型,分别以前4条地震波为输入,进行该高层结构的非线性动力反应分析。结果表明:高层结构对不同类型地震波的过滤作用不同,对长周期地震波的过滤作用更加明显;长周期地震波作用下的结构响应明显大于普通地震波作用下的结构响应,其中位移响应较加速度响应明显。
Two long-period seismic waves with abundant long-period information were selected from earthquake records databases from all over the world. The frequency and spectrum characteristics of these two seismic waves were investigated with the orthogonal HHT( Hilbert-Huang transform) method,and compared with those of two commonly used seismic waves. A complex high-rise building was selected as a case study,in which a finite element model was established with the ANSYS software,and nonlinear dynamic response analysis was conducted on the complex high-rise building with the four seismic waves mentioned above as an input. The results show that the complex high-rise building has different effects in filtering seismic waves,and it can filter long-period seismic waves significantly. In addition,the structure's seismic response to long-period seismic waves is greater than it is to common seismic waves,and the displacement response is more significant than the acceleration responses.
Two long-period seismic waves with abundant long-period information were selected from earthquake records databases from all over the world. The frequency and spectrum characteristics of these two seismic waves were investigated with the orthogonal HHT( Hilbert-Huang transform) method,and compared with those of two commonly used seismic waves. A complex high-rise building was selected as a case study,in which a finite element model was established with the ANSYS software,and nonlinear dynamic response analysis was conducted on the complex high-rise building with the four seismic waves mentioned above as an input. The results show that the complex high-rise building has different effects in filtering seismic waves,and it can filter long-period seismic waves significantly. In addition,the structure's seismic response to long-period seismic waves is greater than it is to common seismic waves,and the displacement response is more significant than the acceleration responses.
引文
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[16]GB 50011-2010建筑抗震设计规范[S].
[2]吕西林.复杂高层建筑结构抗震理论与应用[M].北京:科学出版社,2007.
[3]胡聿贤.地震工程学[M].北京:地震出版社,2006.
[4]谢礼立,周雍年,胡成祥,等.地震动反应谱的长周期特性[J].地震工程与工程振动,1990,10(1):1-19.(XIE Lili,ZHOU Yongnian,HU Chengxiang,et a1.Characteristics of response spectra of long-period earthquake ground motion[J].Earthquake Engineering and Engineering Vibration,1990,10(1):1-19.(in Chinese))
[5]李春锋,张呖.长周期地震动衰减关系研究的迫切性[J].地震地磁观测与研究,2006,27(3):1-8.(LI Chunfeng,ZHANG Yang.Urgency of the study of long-period ground motion[J].Seismological and Geomagnetic Observation and Research,2006,27(3):1-8.(in Chinese))
[6]FACCIOLI E,PAOLUCCI R,REY J.Displacement spectra for long periods[J].Earthquake Spectra,2004,20(2):347-376.
[7]FACCIOLI E,CAUZZI C,PAOLUCCI R.Long period strong ground motion and its use as input to displacement based design[J].Earthquake Geotechnical Engineering,2007,6:23-51.
[8]徐龙军,胡进军,谢礼立.特殊长周期地震动的参数特征研究[J].地震工程与工程振动,2008,28(6):20-27.(XU Longjun,HU Jinjun,XIE Lili.On characteristics of ground motion parameters for special long-period ground motions[J].Earthquake Engineering and Engineering Vibration,2008,28(6):20-27.(in Chinese))
[9]丁海平,刘启方,金星.长周期地震动三维有限元数值模拟方法[J].地震工程与工程振动,2006,26(5):27-31.(DING Haiping,LIU Qifang,JIN Xing.A method of numerical simulation for long-period strong ground motion by 3-D FEM[J].Earthquake Engineering and Engineering Vibration,2006,26(5):27-31(in Chinese))
[10]杨伟林,朱升初,洪海春,等.汶川地震远场地震动特征及其对长周期结构影响的分析[J].防灾减灾工程学报,2009,29(4):473-478.(YANG Weilin,ZHU Shengchu,HONG Haichun,et a1.Characteristics of far-field ground motion of Wenchuan earthquake and the effect on long-periodic structures[J].Journal of Disaster Prevention and Mitigation Engineering,2009,29(4):473-478.(in Chinese))
[11]HUANG N E,SHEN Z,LONG S R,et al.The empirical mode decomposition and Hilbert spectrum for nonlinear and nonstationary time series analysis[J].Proceedings of the Royal Society of London,1998,454:903-906.
[12]吕明林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学出版社,1997.
[13]CLOUGH R W,PENZIEN J.Dynamics of structures[M].New York:Mc Graw-Hill,1993.
[14]阴光华,陈清军.地震波反演与土-结构动力相互作用[J].力学季刊,2010,31(2):256-264.(YIN Guanghua,CHEN Qingjun.Inversion of ground motion and analysis of soil-structure dynamic interaction[J].Chinese Quarterly of Mechanics,2010,31(2):256-264.(in Chinese))
[15]SAEED M.Finite element analysis:theory and application with ANSYS[M].New York:Prentice Hall,2007.
[16]GB 50011-2010建筑抗震设计规范[S].
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