土层随机地震反应分析中侧向边界的影响分析
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摘要
研究了随机地震激励下土层地震反应及土-结构相互作用分析中有限土域的取值范围对计算精度的影响。分别以基岩白噪声谱和杜修力修正基岩谱作为输入,进行了土层随机地震反应分析,探讨了自由边界、固定边界和黏弹性边界3种人工边界条件下土域的取值范围、土介质阻尼和土体长深比(L/H)对土层随机地震反应的影响,给出了侧向人工边界合理位置的具体建议。在此基础上,选取土体的合理边界范围,建立土-结构相互作用分析模型,分别以基岩白噪声谱、杜修力修正基岩谱以及实测地震波功率谱作为输入,进行了土-结构相互作用体系随机地震反应分析,计算结果验证了侧向人工边界取值在土-结构相互作用体系随机地震反应分析中的有效性。
Under random seismic excitations,the precision of results with the scope of soil region in seismic response of soil layer and soil-structure interaction was analyzed.In this paper,with the bedrock white noise spectrum and Du Xiuli modified bedrock spectrum as excitations,random seismic response of soil layer was analyzed;and the effect of random seismic response of soil layer with three artificial boundaries(free boundary,fixed boundary and viscous-spring boundary),damp coefficient and the ratio of width to depth(L/H) was discussed.Based on the above basis,suggestions of reasonable scope of lateral artificial boundary were given.At the same time,with the bedrock white noise spectrum,Du Xiuli modified bedrock spectrum and the power spectrum of seismic waves records as excitations,the random seismic response of soil-structure interaction was analyzed after the reasonable scope of soil selected and the model of soil-structure interaction established.The results show that the scope of lateral artificial boundary is satisfied for random seismic response of soil-structure interaction analysis.
Under random seismic excitations,the precision of results with the scope of soil region in seismic response of soil layer and soil-structure interaction was analyzed.In this paper,with the bedrock white noise spectrum and Du Xiuli modified bedrock spectrum as excitations,random seismic response of soil layer was analyzed;and the effect of random seismic response of soil layer with three artificial boundaries(free boundary,fixed boundary and viscous-spring boundary),damp coefficient and the ratio of width to depth(L/H) was discussed.Based on the above basis,suggestions of reasonable scope of lateral artificial boundary were given.At the same time,with the bedrock white noise spectrum,Du Xiuli modified bedrock spectrum and the power spectrum of seismic waves records as excitations,the random seismic response of soil-structure interaction was analyzed after the reasonable scope of soil selected and the model of soil-structure interaction established.The results show that the scope of lateral artificial boundary is satisfied for random seismic response of soil-structure interaction analysis.
引文
[1]楼梦麟,潘旦光,范立础.土层地震反应中侧向人工边界的影响[J].同济大学学报,2003,31(7):757-761.LOU Meng-lin,PAN Dan-guang,FAN Li-chu.Effect of vertical artificial boundary on seismic response of soil layer[J].Journal of Tongji University,2003,31(7):757-761.
[2]何海龙.不同形式高层结构地震反应及抗震可靠度[硕士学位论文D].上海:同济大学,2005.
[3]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49-56.DU Xiu-li,ZHAO Mi,WANG Jin-ting.A stress artificial boundary in FEA for near-field wave problem[J].Chinese Journal of Theoretical and Applied Mechanics,2006,38(1):49-56.
[4]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-36.LOU Meng-lin,WANG Wen-jian,ZHU Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30-36.
[5]DEEKS A J,RANDOLPH M F.Axisymmetric time-domain transmitting boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42.
[6]LYSMER J,KUHLEMEYER R L.Finite dynamic model for infinite media[J].Journal of the Engineering Mechanics Division,ASCE,1969,95(1):859-877.
[7]林家浩,钟亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[8]欧进萍,王光远.结构随机振动[M].北京:高等教育出版社,1998.
[9]刘晶波,杜义欣,闰秋实.黏弹性人工边界及地震动输入在通用有限元软件中的实现[J].防灾减灾工程学报,2007,27(增刊):37-42.LIU Jing-bo,DU Yi-xin,RUN Qiu-shi.Realization of viscous-spring boundary and seismic input in general FEM software[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(Supp.):37-42.
[10]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(14):76-81.DU Xiu-li.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Earthquake Engineering and Engineering Vibration,1998,18(14):76-81.
[2]何海龙.不同形式高层结构地震反应及抗震可靠度[硕士学位论文D].上海:同济大学,2005.
[3]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49-56.DU Xiu-li,ZHAO Mi,WANG Jin-ting.A stress artificial boundary in FEA for near-field wave problem[J].Chinese Journal of Theoretical and Applied Mechanics,2006,38(1):49-56.
[4]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-36.LOU Meng-lin,WANG Wen-jian,ZHU Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30-36.
[5]DEEKS A J,RANDOLPH M F.Axisymmetric time-domain transmitting boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42.
[6]LYSMER J,KUHLEMEYER R L.Finite dynamic model for infinite media[J].Journal of the Engineering Mechanics Division,ASCE,1969,95(1):859-877.
[7]林家浩,钟亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[8]欧进萍,王光远.结构随机振动[M].北京:高等教育出版社,1998.
[9]刘晶波,杜义欣,闰秋实.黏弹性人工边界及地震动输入在通用有限元软件中的实现[J].防灾减灾工程学报,2007,27(增刊):37-42.LIU Jing-bo,DU Yi-xin,RUN Qiu-shi.Realization of viscous-spring boundary and seismic input in general FEM software[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(Supp.):37-42.
[10]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(14):76-81.DU Xiu-li.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Earthquake Engineering and Engineering Vibration,1998,18(14):76-81.
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