考虑地震动持时影响的非结构构件加速度响应预测
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摘要
持续时间是地震动的关键参数之一,对主体结构的振动加速度峰值和振动持时有重要影响,并进而影响到非结构构件的地震加速度响应。本文以附加非结构构件的单自由度结构系统为对象,通过数值分析考察了地震动持时对加速度响应的影响规律。分析了共振状态简谐激励持时对结构系统加速度放大率的影响,结果表明激励持时增加时,非结构构件加速度峰值增长速度显著高于主体结构加速度峰值增长速度。研究了具有不同持时的人工地震波作用下结构的楼层反应谱特征,并建立了地震动持时对加速度响应影响的量化关系,在既有楼层反应谱估计方法的基础上提出了考虑地震动持时影响的评估方法。计算结果表明本文方法能较准确地预测不同持时地震动作用下的楼层反应谱。
The duration is one of the key parameters of earthquake ground motion. It has great influence on the vibration amplitude and duration of the main structure, and thus affects the acceleration response of non-structural components. A single-degree-of-freedom structure with added non-structural component is considered in this study, and the effect of the duration of excitation on the acceleration of non-structural component is analyzed. The acceleration responses of structural system in resonance are analyzed, and it is shown that as the duration of harmonic excitation increases, the acceleration of non-structural component increases more significantly than that of main structure. The floor acceleration response spectra of structure subjected to artificial ground motions are also analyzed, and the effect of the significant duration of ground motion on floor response spectra is obtained. The previously proposed direct estimation method for floor response spectra is modified by considering the effect of duration. The numerical results prove that the proposed method simulates the acceleration response of non-structural component with better accuracy.
The duration is one of the key parameters of earthquake ground motion. It has great influence on the vibration amplitude and duration of the main structure, and thus affects the acceleration response of non-structural components. A single-degree-of-freedom structure with added non-structural component is considered in this study, and the effect of the duration of excitation on the acceleration of non-structural component is analyzed. The acceleration responses of structural system in resonance are analyzed, and it is shown that as the duration of harmonic excitation increases, the acceleration of non-structural component increases more significantly than that of main structure. The floor acceleration response spectra of structure subjected to artificial ground motions are also analyzed, and the effect of the significant duration of ground motion on floor response spectra is obtained. The previously proposed direct estimation method for floor response spectra is modified by considering the effect of duration. The numerical results prove that the proposed method simulates the acceleration response of non-structural component with better accuracy.
引文
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[11] 刘小娟,蒋欢军.非结构构件基于性能的抗震研究进展[J].地震工程与工程振动,2013,33(6):53-62.LIU Xiaojuan,JIANG Huanjun.State-of-art of performance-based seismic research on nonstructural components [J].Earthquake Engineering and Engineering Dynamics,2013,33(6):53-62.(in Chinese)
[12] 李宏男,国巍.楼板谱研究述评[J].世界地震工程,2006,22(2):7-13.LI Hongnan,GUO Wei.State-of-art review on development of floor response spectrum [J].World Earthquake Engineering,2006,22(2):7-13.(in Chinese)
[13] AnilK.Chopra.结构动力学:理论及其在地震工程中的应用[M].谢礼立,吕大刚等译.北京:高等教育出版社,2007.AnilK.Chopra.Dynamics of structures:theory and applications to earthquake engineering [M].Translated by Xie Lili and Lv Dagang,et al.Beijing:Higher Education Press,2007.(in Chinese)
[14] Seismosoft (2013).SeismoArtif v2.1.0-a new tool for artificial accelerograms generation.http://www.seismosoft.com.
[15] Yasui Y,Yoshihara J,Takeda T et al.Direct generation method for floor response spectra [C]//Transactions of the 12th International Conference on Structural Mechanics in Reactor Technology (SMiRT 12),Stuttgart,Germany,1993.
[2] GB50011-2010 建筑抗震设计规范 [S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings [S].Beijing;Building Industry Press of China,2010.(in Chinese)
[3] FEMA E-74,Reducing the Risks of Nonstructural Earthquake Damage-A Practical Guide [S].Federal Emergency Management Agency:Washington,D.C.,2012,USA.
[4] 秦权,李瑛.非结构构件和设备的抗震设计楼面谱[J].清华大学学报:自然科学版,1997,37(6):84-88.QIN Quan,LI Ying.Design floor spectra for nonstructural components and equipment in buildings [J].Journal of Tsinghua Universitu:Science and Technology,1997,37(6):84-88.(in Chinese)
[5] 秦权,聂宇.非结构构件和设备的抗震设计和简化计算方法[J].建筑结构学报,2001,22(3):15-20.QIN Quan,NIE Yu.Seismic design and simplified analytical method of nonstructural components and equipment in buildings [J].Journal of Building Structures,2001,22(3):15-20.(in Chinese)
[6] 苏经宇,樊水荣,谭健.确定楼面反应谱的简化方法[J].建筑科学,1991(2):29-36.SU Jingyu,FAN Shuirong,TAN Jian.Simplified method for the determination of floor response spectra [J].Building Science,1991(2):29-36.(in Chinese)
[7] 张建霖,杨智春.随机输入条件下的楼层反应谱分析[J].西北工业大学学报,2003,21(6):650-653.ZHANG Jianlin,YANG Zhichun.A better analysis of floor response spectrum under random input for seismic design [J].Journal of Northwestern Polytechnical University,2003,21(6):650-653.(in Chinese)
[8] 林皋,李建波,钟红,等.考虑地震动不确定性的核电厂楼层反应谱分析[J].大连理工大学学报,2012,52(3):387-392.LI Gao,LI Jianbo,ZHONG Hong,et al.Analysis of floor response spectrum in nuclear power plants taking into consideration uncertainty of ground motion input [J].Journal of Dalian University of Technology,2012,52(3):387-392.(in Chinese)
[9] Vukobratovic V,Fajfar P.A method for the direct determination of approximate floor response spectra for SDOF inelastic structures [J].Bulletin of Earthquake Engineering,2015,13(5):1405-1424.
[10] Vukobratovic V and Fajfar P.A method for the direct estimation of floor acceleration spectra for elastic and inelastic MDOF structures [J].Bulletin of Earthquake Engineering,2016,45(15):2495-2511.
[11] 刘小娟,蒋欢军.非结构构件基于性能的抗震研究进展[J].地震工程与工程振动,2013,33(6):53-62.LIU Xiaojuan,JIANG Huanjun.State-of-art of performance-based seismic research on nonstructural components [J].Earthquake Engineering and Engineering Dynamics,2013,33(6):53-62.(in Chinese)
[12] 李宏男,国巍.楼板谱研究述评[J].世界地震工程,2006,22(2):7-13.LI Hongnan,GUO Wei.State-of-art review on development of floor response spectrum [J].World Earthquake Engineering,2006,22(2):7-13.(in Chinese)
[13] AnilK.Chopra.结构动力学:理论及其在地震工程中的应用[M].谢礼立,吕大刚等译.北京:高等教育出版社,2007.AnilK.Chopra.Dynamics of structures:theory and applications to earthquake engineering [M].Translated by Xie Lili and Lv Dagang,et al.Beijing:Higher Education Press,2007.(in Chinese)
[14] Seismosoft (2013).SeismoArtif v2.1.0-a new tool for artificial accelerograms generation.http://www.seismosoft.com.
[15] Yasui Y,Yoshihara J,Takeda T et al.Direct generation method for floor response spectra [C]//Transactions of the 12th International Conference on Structural Mechanics in Reactor Technology (SMiRT 12),Stuttgart,Germany,1993.