泉州盆地地震效应的二维非线性分析
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摘要
基于ABAQUS显式有限元并行计算平台,采用大尺度二维精细化有限元非线性分析方法,研究泉州盆地地震效应特征。结果表明:(1)与基岩输入地震动相比,地表峰值加速度总体呈放大效应,且盆地不同位置的放大效应存在明显差异;(2)地表或基岩剧烈起伏及土层横向分布极不均匀处,地震动易产生局部聚集效应,相应地表地震动呈显著放大或缩小效应;地表加速度反应谱产生双峰甚至多峰现象。(3)在土层竖向、横向分布不均匀处,峰值加速度沿深度方向呈非单调递减,加速度反应谱沿深度存在较大差异。场地地震效应的二维非线性分析法能在一定程度上反映特殊场地条件对地震动效应的影响,该结果可为泉州盆地及类似盆地的场地设计地震动参数的确定提供参考依据。
Based on the explicit FE method and parallel computing cluster platform of ABAQUS,large-scale refined two-dimensional(2D) FE nonlinear analytical models for Quanzhou Basin were established in the time domain for researches of seismic effect characteristics.The results show that:(1) Compared with the bedrock input ground motion,the peak ground acceleration(PGA) would be amplified,however,the amplification effect seems to be obviously diverse in different location.(2) Considering the inhomogeneity of ground soils and fluctuation of topography and bedrock surface,the surface ground motion has the focusing effects and the acceleration response spectrum of surface contains double-peak and multi-peak(3) Considering the horizontal and vertical uneven distribution of soils,the PGA has a non-monotonic decreasing characteristic with depth and the acceleration response spectrum shows greater differences.To some extent,two-dimensional nonlinear seismic response analysis can reflect the seismic response characteristics of different site conditions,which can be taken as a reference for determination of design earthquake ground motion parameters on Quanzhou and similar basins.
Based on the explicit FE method and parallel computing cluster platform of ABAQUS,large-scale refined two-dimensional(2D) FE nonlinear analytical models for Quanzhou Basin were established in the time domain for researches of seismic effect characteristics.The results show that:(1) Compared with the bedrock input ground motion,the peak ground acceleration(PGA) would be amplified,however,the amplification effect seems to be obviously diverse in different location.(2) Considering the inhomogeneity of ground soils and fluctuation of topography and bedrock surface,the surface ground motion has the focusing effects and the acceleration response spectrum of surface contains double-peak and multi-peak(3) Considering the horizontal and vertical uneven distribution of soils,the PGA has a non-monotonic decreasing characteristic with depth and the acceleration response spectrum shows greater differences.To some extent,two-dimensional nonlinear seismic response analysis can reflect the seismic response characteristics of different site conditions,which can be taken as a reference for determination of design earthquake ground motion parameters on Quanzhou and similar basins.
引文
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[2]薄景山,齐文浩,刘红帅,等.汶川特大地震汉源烈度异常原因的初步分析[J].地震工程与工程振动,2009,29(6):53-64.BO Jingshan,QI Wenhao,LIU Hongshuai,et al.Abnormality of seismic intensity in Hanyuan during Wenchuan earthquake[J].Journal of Earth-quake Engineering and Engineering Vibration,2009,29(6):53-64.(in Chinese)
[3]战吉艳,陈国兴,刘建达.深软场地大地震远场地震动反应特性分析[J].岩土力学,2011,32(S1):507-514.ZHAN Jiyan,CHEN Guoxing,LIU Jianda.Seismic response characteristics analysis of deep soft site under far-field ground motion of great earth-quake[J].Rock and Soil Mechanics,2011,321(S1):507-514.(in Chinese)
[4]李咸亨,吴志明,罗胜元,等.台北盆地地盘震动反应分析探讨[J].岩土工程学报,2002,24(2):154-158.LI Xianheng,WU Zhiming,LUO Shengyuan,et al.The seismic ground response of Taipei basin[J].Chinese Journal of Geotechnical Engineering,2002,24(2):154-158.(in Chinese)
[5]刘海明.漳州盆地地震反应分析[D].哈尔滨:哈尔滨工业大学,2007.LIU Haiming.Seismic response of the Zhangzhou Basin[D].Harbin Institute of Technology,2007.(in Chinese)
[6]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.BO Jingshan,LI Xiuling,LI Shanyou.Some progress of study on the effect of site conditions on ground moiton[J].World Earthquake Engineer-ing,2003,19(2):11-15.(in Chinese)
[7]Youssef M A,Hashash D P.Non-linear one-dimensional seismic ground motion propagation in the Mississippi embayment[J].Engineering Geolo-gy,2001,62(2):185-206.
[8]Kausel E,Assimaki D.Seismic simulation of inelastic soilvia frequency-dependent moduli and damping[J].Journal of Engineering Mechanics,ASCE,2002,128(1):34-46.
[9]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.LIU Jingbo,GU Yin,DU Yixin,Consistent viscous-spring artificial boundaries and viscous-spring boundary elements[J].Chinese Journal ofGeotechnical Engineering,2006,28(9):1070-1075.(in Chinese)
[10]毛昆明,陈国兴.基于Abaqus软件的并行计算异构集群平台的搭建[J].地震工程与工程振动,2011,31(5):184-189.MAO Kunming,CHEN Guoxing.Construction of parallel computing heterogeneous cluster platform based on Abaqus software[J].Journal ofEarthquake Engineering and Engineering Vibration,2011(5):184-189.(in Chinese)
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