断层附近的地震波频谱特性与结构动力反应分析
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摘要
在5.12汶川大地震中,国家数字强震动台网布设在龙门山断裂带及其周围地区有50多个台站获得了大于100 gal的加速度记录。选取其中断层附近21个台站的加速度记录,比较分析了断层附近基岩和土层表面地震波的时、频特性;在此基础上,分别以实测基岩地震波和土层表面波作为输入,对框架结构进行了地震反应分析,比较了不同地震波作用下结构反应的差异,得到了有工程参考价值的结果。
In "5.12" Wenchuan Earthquake,there were more than 50 stations in Longmenshan Mountain fracture zone and its circumference,through which acceleration reconds were collected by China strongmotion net center.The maximum amplitudes of acceleration are greater than 100 Gal.In the article,acceleration reconds from 21 stations were selected,the feature of time domain and frequency domain about the bedrock and soil seismic wave near the faultage were compared and analyzed.Based on it,taking the measured bedrock wave and soil wave as the inputs,the seismic responses of a frame structure were analyzed.Then,the differences of the frame structure under the impacts of the different seismic inputs were compared,at the same time,some valuable results were got,which are beneficial for the practical engineering activity.
In "5.12" Wenchuan Earthquake,there were more than 50 stations in Longmenshan Mountain fracture zone and its circumference,through which acceleration reconds were collected by China strongmotion net center.The maximum amplitudes of acceleration are greater than 100 Gal.In the article,acceleration reconds from 21 stations were selected,the feature of time domain and frequency domain about the bedrock and soil seismic wave near the faultage were compared and analyzed.Based on it,taking the measured bedrock wave and soil wave as the inputs,the seismic responses of a frame structure were analyzed.Then,the differences of the frame structure under the impacts of the different seismic inputs were compared,at the same time,some valuable results were got,which are beneficial for the practical engineering activity.
引文
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[3]薄景山,李秀领,刘红帅,等.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003,23(3):35-40.Bo J S,Li X L,Liu H S,et al.Effects of soil layerconstruction on peak accelerations of ground motions[J].Earthquake Engineering and EngineeringVibration,2003,23(3):35-40.(in Chinese)
[4]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992.Li J,Li G Q.The earthquake engineering introduction[M].Beijing:The Earthquake Press,1992.(inChinese)
[5]建筑科学研究院.GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.The standards of the People’s Republic of China.GB50011—2010 Code for seismic desige of buildings[S].Beijing:China Archiecture&Buliding,2010.(inChinese)
[6]薄景山,李秀领,刘德东,等.土层结构对反应谱特征周期的影响[J].地震工程与工程振动,2003,23(5):42-45.Bo J S,Li X L,Liu D D,et al.Effects of soil layerconstruction on characteristic periods of responsespectra[J].Earthquake Engineering and EngineeringVibration,2003,23(5):42-45.(in Chinese)
[7]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.Zhang K X,Xie J F.The dynamics of soil[M].Beijing:The earthquake press,1989.(in Chinese)
[8]张振炫,陈清军.高层建筑结构长周期地震反应的比较研究[J].结构工程师,2009,25(4):78-85.Zhang Z X,Chen Q J.A comparative study on long-period seismic responses for high-rise structures[J].Structural Engineers,2009,25(4):78-85.(inChinese)
[9]谢礼立,张晓志.地震动记录持时与工程持时[J].地震工程与工程振动,1988,8(1):31-38.Xie L L,Zhang X Z.The time length of earthquakerecords and the time length of engineering[J].Earthquake Engineering and Engineering Vibration,1988,8(1):31-38.(in Chinese)
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