地震动特性对长周期结构反应谱的影响研究
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摘要
建筑结构抗震设计方法应能体现地震动主要特性的影响。作为结构抗震设计主要方法之一的反应谱法一直以来被认为只能反映地震动的频谱和振幅影响,对于地震动持时特性的影响则未能有明确反映。通过选用高通低截止频率的强震记录,建立长周期反应谱,研究了地震动振幅和持时对长周期结构反应谱形状和谱值的影响,探讨了利用反应谱法体现地震动持时对结构地震响应影响的可能性。研究结果表明,地震动振幅仅影响长周期结构反应谱的谱值,地震动持时对速度谱影响较小,对加速度谱和相对位移谱的长周期段谱值影响较大,在抗震设计中可通过将加速度谱或相对位移谱乘以持时调整系数来反映地震动持时对长周期结构地震响应的影响。
Influence of characteristics of ground motion on structural seismic response should be embodied in structural seismic design method.As one of these methods,response spectrum method has been considered to only embody the influence of frequency spectrum and amplitude of to structural seismic response,but influence of duration.By selecting strong motion records with low usable frequency,influence of amplitude and duration on seismic response of long-period structure was studied as well as probability of using response spectrum method to embody influence of duration on structural seismic response.The results show that the acceleration amplitude only has influence on response spectral value,and the duration has little influence on velocity spectrum compared with the influence of duration on absolute acceleration spectrum and relative displacement spectrum,the influence of duration on seismic response of long-period structure can be considered by acceleration or displacement spectrum multiplied by adjustment coefficient of duration in structural seismic design.
Influence of characteristics of ground motion on structural seismic response should be embodied in structural seismic design method.As one of these methods,response spectrum method has been considered to only embody the influence of frequency spectrum and amplitude of to structural seismic response,but influence of duration.By selecting strong motion records with low usable frequency,influence of amplitude and duration on seismic response of long-period structure was studied as well as probability of using response spectrum method to embody influence of duration on structural seismic response.The results show that the acceleration amplitude only has influence on response spectral value,and the duration has little influence on velocity spectrum compared with the influence of duration on absolute acceleration spectrum and relative displacement spectrum,the influence of duration on seismic response of long-period structure can be considered by acceleration or displacement spectrum multiplied by adjustment coefficient of duration in structural seismic design.
引文
[1]胡聿贤.地震工程学[M].北京:地震出版社,2006:91-102.
[2]王广军.建筑抗震设计规范手册(中册)[M].北京:中国建筑工业出版社,1990:295-299.
[3]周锡元,齐微,徐平,等.震级、震中距和场地条件对反应谱特性影响的统计分析[J].北京工业大学学报,2006,32(2):97-103.
[4]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[5]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997:1-8.
[2]王广军.建筑抗震设计规范手册(中册)[M].北京:中国建筑工业出版社,1990:295-299.
[3]周锡元,齐微,徐平,等.震级、震中距和场地条件对反应谱特性影响的统计分析[J].北京工业大学学报,2006,32(2):97-103.
[4]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[5]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997:1-8.
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