群桩-承台体系动力阻抗的近似计算方法
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摘要
采用数值方法对群桩-承台体系的动力阻抗进行了分析.根据两个不同规模的群桩-承台体系的动力阻抗计算结果,发现在结构抗震所重点关注的低频段,群桩-土体-承台的动力相互作用与频率的相关性较小,因此可采用群桩-承台的静力相互作用关系代替其动力相互作用关系计算群桩-承台体系的动力阻抗.文中通过若干算例近似得到了群桩-承台的静力相互作用关系,并给出了利用群桩和承台的动力阻抗计算群桩-承台体系水平、摇摆和水平-摇摆耦合动力阻抗的简化计算公式.
In this paper,numerical procedures are first adopted to analyze the impedance of pile group-slab system.Based on the calculated impedance of two pile group-slab systems with different configurations,it is found that the dynamic interaction in the pile group-soil-slab system has low frequency dependence during the low-frequency vibration that is most concerned in the aseismatic design,so that,in the calculation of impedance of the pile group-soil-slab system,the dynamic interaction can be replaced by the static interaction.Based on the above-mentioned results,the static interaction in the pile group-slab system is then obtained via illustrations,and some simplified formulae for calculating the lateral,rocking and cross-lateral-rocking impedances of the system are presented.
In this paper,numerical procedures are first adopted to analyze the impedance of pile group-slab system.Based on the calculated impedance of two pile group-slab systems with different configurations,it is found that the dynamic interaction in the pile group-soil-slab system has low frequency dependence during the low-frequency vibration that is most concerned in the aseismatic design,so that,in the calculation of impedance of the pile group-soil-slab system,the dynamic interaction can be replaced by the static interaction.Based on the above-mentioned results,the static interaction in the pile group-slab system is then obtained via illustrations,and some simplified formulae for calculating the lateral,rocking and cross-lateral-rocking impedances of the system are presented.
引文
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[10]蒯行成,田建华.低承台群桩动力阻抗的有限元分析[J].湖南大学学报:自然科学版,2004,31(4):55-59.Kuai Xing-cheng,Tian Jian-hua.Finite element analysisof dynamic impedance of pile groups with embeddedcaps[J].Journal of Hunan University:Natural Sci-ences,2004,31(4):55-59.
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[12]雷文军.地基-桩(箱)基-上部结构动力相互作用研究[D].广州:华南理工大学建筑学院,2005.
[2]Gazetas G.Formulas and charts for impedance of surfaceand embedded foundations[J].Journal of GeotechnicalEngineering,ASCE,1991,117(9):1363-1381.
[3]Dobry R,Gazetas G.Simple method for dynamic stiffnessand damping of floating pile groups[J].Geotechnique,1988,38(4):557-574.
[4]Gazetas G,Makris N.Dynamic pile-soil-pile interaction(Part I):analysis of axial vibration[J].Earthquake En-gineering and Structure Dynamics,1991,20:115-132.
[5]Makris N,Gazetas G.Dynamic pile-soil-pile interaction(Part II):lateral and seismic response[J].EarthquakeEngineering and Structure Dynamics,1992,21:145-162.
[6]雷文军,魏德敏.分层土中单桩的水平动刚度计算[J].华南理工大学学报:自然科学版,2002,30(10):84-87.Lei Wen-jun,Wei De-min.The lateral impedance of sin-gle pile in layered soil[J].Journal of South China Uni-versity of Technology:Natural Science Edition,2002,30(10):84-87.
[7]雷文军,魏德敏.分层土中群桩的竖向和摇摆动力阻抗计算[J].工程力学,2007,24(2):91-97.Lei Wen-jun,Wei De-min.The vertical and rocking im-pedance of pile groups in layered soils[J].EngineeringMechanics,2007,24(2):91-97.
[8]陈跃庆,吕西林,李培振,等.结构-地基相互作用体系动力特性参数的简化计算方法[J].地震工程与工程振动,2003,23(1))71-77.Chen Yue-qing,L櫣Xi-lin,Li Pei-zhen,et al.Simplifiedmethod for calculating dynamic characteristics of soil-structure interaction system[J].Earthquake Engineeringand Engineering Vibration,2003,23(1):71-77.
[9]燕彬,黄义.群桩刚性承台竖向动阻抗的简化计算[J].岩土工程学报,2004,26(5):645-648.Yan Bin,Huang Yi.Simple method for calculating verticaldynamic impedance of rigidly-capped pile groups[J].Chinese Journal of Geotechnical Engineering,2004,26(5):645-648.
[10]蒯行成,田建华.低承台群桩动力阻抗的有限元分析[J].湖南大学学报:自然科学版,2004,31(4):55-59.Kuai Xing-cheng,Tian Jian-hua.Finite element analysisof dynamic impedance of pile groups with embeddedcaps[J].Journal of Hunan University:Natural Sci-ences,2004,31(4):55-59.
[11]雷文军,魏德敏.无限域地基有限元分析的简化粘弹性边界[J].地震工程与工程振动,2005,25(3):110-114.Lei Wen-jun,Wei De-min.Spring-viscous boundary infinite element analysis for infinite media[J].Earth-quake Engineering and Engineering Vibration,2005,25(3):110-114.
[12]雷文军.地基-桩(箱)基-上部结构动力相互作用研究[D].广州:华南理工大学建筑学院,2005.
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