强震下地铁车站结构动力响应特性
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摘要
研究地下结构在地震中的动力响应,对地铁的建设和安全运营有重要的现实意义。根据试验条件和Bock ingham定理,作者确定了试验相似比,针对北京地区的地质条件和典型的地铁车站结构进行了大型振动台试验,并对得到的加速度时程进行了分析。通过分析,发现土与地下结构间存在相互作用,但地下结构不会表现出其自振频率,而是随着土体一起振动;在低强度地震下,地下结构对土体影响较小;在高强度地震下,地下结构对土体影响较大;峰值加速度的放大倍数不会超过2,且同一点的放大倍数基本保持不变;随埋深的增加,卓越频率和其振幅会减小,且加速度峰值也有相似的规律。
It is important to study the seismic behavior on a subway station for its construction and safe management.According to the test conditions and Buckingham Theorem,the dynamic similarity coefficients are given,and the shaking table test of model is made to simulate a typical subway station structure in soil with specific concerns to the geological conditions in Beijing area.Based on the analysis of the acceleration history curves on the model,it is concluded that the interaction between the structure and the soil exits,but the underground structure doesn't behave in its natural frequencies,and vibrates togather with the soil.Under the low intensity earthquake,the underground structure will exert a very small influence on the soil;under the high intensity earthquake,the underground will exert a large influence on the soil.Moreover,the following conclusions are drawn that the magnification of the peak acceleration is no more than 2 times for the model.With the depth increase,the dominant frequency and its amplitude decrease,and the peak acceleration also does.With the intensity increase,the peak acceleration magnification is basically invariable at the same point.
It is important to study the seismic behavior on a subway station for its construction and safe management.According to the test conditions and Buckingham Theorem,the dynamic similarity coefficients are given,and the shaking table test of model is made to simulate a typical subway station structure in soil with specific concerns to the geological conditions in Beijing area.Based on the analysis of the acceleration history curves on the model,it is concluded that the interaction between the structure and the soil exits,but the underground structure doesn't behave in its natural frequencies,and vibrates togather with the soil.Under the low intensity earthquake,the underground structure will exert a very small influence on the soil;under the high intensity earthquake,the underground will exert a large influence on the soil.Moreover,the following conclusions are drawn that the magnification of the peak acceleration is no more than 2 times for the model.With the depth increase,the dominant frequency and its amplitude decrease,and the peak acceleration also does.With the intensity increase,the peak acceleration magnification is basically invariable at the same point.
引文
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[2]Matsui J,Ohtomo K,Kanaya K.Development and validation of nonlinear dynamic analysis in seismic performance verificationof underground RCstructures[J].Journal of Advanced Concrete Technology,2004,2:25-35.
[3]尚昊,郭志昆,张武刚.大断面地下结构抗震模型试验[J].岩土工程界,2002,5(10):60-62.Shang Hao,Guo Zhikun,Zhang Wugang.Seismic model test on the large-section underground structure[J].Geoengineering,2002,5(10):60-62.
[4]宫必宁,赵大鹏.地下结构与土动力相互作用试验研究[J].地下空间,2002,22(4):320-326.Gong Bining,Zhao Dapeng.Test study on the soil and underground structure interaction[J].Underground Space,2002,22(4):320-326.
[5]季倩倩.地铁车站结构振动台模型试验研究[D].上海:同济大学,2002:1-20.JI Qianqian.Subway station model shaking table test study[D].Shanghai:Tongji University,2002:1-20.
[6]边金,陶连金,郭军.浅埋地下结构和土层在地震中的反应[J].世界地震工程,2005,21(4):49-53.Bian Jin,Tao Lianjin,Guo Jun.The dynamic reaction of the shallow underground structure and its neighboring soil during the earthquake[J].World Earthquake Engineering,2005,21(4):49-53.
[7]Uenishi K,Sakurai S.Characteristic of the vertical seismic waves assoctiated with the 1995 Hyogo-ken Nanbu(Kobe),Japan earthquake estimatedfrom the failure of the Daikai underground station[J].Earthquake Engineering and Structural Dynamics,2000,29(6):813-821.
[8]Gazetas G,Gerolymos N.Anastasopoulos I.Response of three Athens metro underground structures in the 1999 Parnitha earthquake[J].Soil Dy-namics and Earthquake Engineering,2000,29(6):813-821.
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