双向地震动作用下刚度偏心单层体系弹性反应谱研究
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摘要
目前的工程抗震设计方法是建立在弹性单自由度反应谱的基础上,然而实际地震动的多维性和结构偏心引起的空间耦合性使得基于单自由度反应谱的设计方法存在着局限性。为此,研究并建立了双向地震作用下结构刚度偏心层体系弹性反应谱模型,定义弹性位移比值谱和加速度比值谱。通过对硬土、中硬(软)土、软土3类场地60条双向地震动的弹性比值谱统计平均结果,分析3类场地比值谱的谱值分布特征及相对刚度偏心距、扭转频率比对谱值及谱值分布的影响。结果表明,各类场地的比值谱都具有独特的谱值分布特征,并且这些分布特征受相对刚度偏心距和扭转频率比的影响较小。在每种场地类型的谱值分布特征下,弹性比值谱随相对刚度偏心距和扭转频率比的变化也具有一定的规律性。
The limitation in the application of elastic response spectra of one degree of freedom system is presented and its model is developed in considering the bidirection earthquake excitation.The elastic ratio response spectrum is also introduced.The ratio spectrum distribution pattern and the effects of normalized stiffness eccentricity and rotation frequency ratio on spectrum amplitude are discussed by use of statistic analysis of 30 recordings under bidirectional earthquake excitation in the cases of hard site,medium site and soft site.The analysis shows that the ratio spectra distribution pattern on each kind of site is of regularity and is affected hardly by normalized stiffness eccentricity and rotation frequency ratio,while the effect of these factors on the spectrum amplitude is obvious and is also of certain regularity.
The limitation in the application of elastic response spectra of one degree of freedom system is presented and its model is developed in considering the bidirection earthquake excitation.The elastic ratio response spectrum is also introduced.The ratio spectrum distribution pattern and the effects of normalized stiffness eccentricity and rotation frequency ratio on spectrum amplitude are discussed by use of statistic analysis of 30 recordings under bidirectional earthquake excitation in the cases of hard site,medium site and soft site.The analysis shows that the ratio spectra distribution pattern on each kind of site is of regularity and is affected hardly by normalized stiffness eccentricity and rotation frequency ratio,while the effect of these factors on the spectrum amplitude is obvious and is also of certain regularity.
引文
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[10]王东升,李宏男,王国新.双向地震动作用弹塑性反应谱研究[J].大连理工大学学报,2005,45(2):248—254.
[2]哈莉亚.达力列汗.反应谱及反应谱的局限性[J].工程结构,2004,24(6):110—112.
[3]中华人民共和国国家标准.建筑抗震设计规范(GB50011-2001)[M].北京:中国建筑工业出版社,2001.
[4]李宏男,尹之潜.偏心结构在多维地面运动作用下扭转耦联反映分析[J].地震工程与工程震动,1988,8(4):45—53.
[5]李宏男.地震动的转动分量及有关的结构反应分析[J].世界地震工程,1991,(4):44—51.
[6]周晓松,裴星洙,廖述清.单层偏心结构平扭耦合地震反应分析[J].工程建设与设计,2005,(3):56—60.
[7]李宏男著.结构多维抗震理论与设计方法[M].北京:科学出版社,1998.
[8]Rafael Riddell,Hernan Santa-Maria.Inelastic response of one-storey asymmetric-plan systems subjected to bi-directional eathquake motions[J].Earthquake Engineering and Stuctural Dynamics,1999,28:273—285.
[9]王东升.双向地震动作用弹塑性反应谱及结构基于位移的抗震设计研究[C].大连理工大学博士后研究报告,2004.
[10]王东升,李宏男,王国新.双向地震动作用弹塑性反应谱研究[J].大连理工大学学报,2005,45(2):248—254.
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