地震荷载下刚性桩复合地基变刚度调平前后的性状分析
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摘要
基于ABAQUS有限元软件模拟分析,通过模拟土的动力本构模型,选取合理的人工边界,建立了2种刚性桩复合地基与上部结构相互作用体系有限元动力分析模型,采用时程分析法对刚性桩复合地基调平前后进行地震响应分析。结果表明,调平后刚性桩复合地基对相互作用体系中上部结构的动力反应明显要比调平前时动力反应小;调平后的筏板基础在地震荷载载作用下,筏板较调平前的弯矩更小,差异沉降也更小;调平后刚性桩复合地基中,在地震荷载下长桩的最大弯矩和水平位移远大于短桩,长桩在变刚度处弯矩较大,容易发生断桩。通过对比指出,调平后刚性桩复合地基在同等经济条件下抗震性能优于调平前。
Based on ABAQUS finite element analysis software simulation,two kinds of finite element models for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established by simulating the soil dynamic constitutive model and selecting appropriate artificial boundary. The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that: dynamic response of rigid pile composite foundation on balance varying rigidity on the upper structure is significantly smaller than that of on imbalance of varying rigidity on the upper structure; raft bending moment and differetial settlement of rigid pile composite foundation on balance varying rigidity is smaller under seismic load; the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads,the long pile of bending moment is larger in the position of stiffness change. By constrast,under the same economic condition,the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.
引文
[1]刘金砺,迟铃泉.桩土变形计算模型和变刚度调平设计[J].岩土工程学报,2000,22(2):151~157Liu Jin-li,Chi Ling-quan.The Modified Model of Pilesoil Deformation Calculation and Variable Rigidity Design Method for Balance Settlement[J].Chinese Journal of Geotechnical Engineering,2000,22(2):151~157(in Chinese)
    [2]王涛.变刚度调平布桩模式下筏底地基土承载性状研究[J].岩土工程学报,2011,33(7):1014~1021Wang Tao.Study on Implemention Method for Optimization Design of Pile Foundation Stiffness to Reduce Differential Settlement[J].Chinese Journal of Geotechnical Engineering,2011,33(7):1014-1021(in Chinese)
    [3]高俊义,马克生.桩基变刚度调平前后在水平力及偏心荷载下的性状分析[J].四川建筑科学研究,2014,40(1):147~151Gao Jun-yi,Ma Ke-sheng.Character Analysis of Balance and Imbalance of Varying Rigidity of Pile Foundation under Horizontal and Vertical Eccentric Load[J].Sichuan Building Science,2014,40(1):147~151(in Chinese)
    [4]夏栋舟,何益斌,刘建华.刚性桩复合地基-上部结构动力相互作用体系抗震性能及影响因素分析[J].岩土工程学报,2009,30(11):3504~3511Xia Dong-zhou,He Yi-bin,Liu Jian-hua.Analysis of Aseismic Capability and Influential Factors for Rigid Pile Composite Foundation-superstructure Dynamic Interaction System[J].Chinese Journal of Geotechnical Engineering,2009,30(11):3504~3511(in Chinese)
    [5]刘光磊,武思宇,宋二祥.群桩刚性桩复合地基地震反应三维有限元分析[J].建筑结构,2006,36(7):85~90Liu Guang-lei,Wu Si-yu,Song Er-xiang.Earthquake Response of Rigid Pile Composite Foundation Analyzed with3D Dynamic Finite Element Method[J].Chinese Journal of Building Structure,2006,36(7):85~90(in Chinese)
    [6]徐自国,宋二祥.刚性桩复合地基抗震性能的有限元分析[J].岩土力学,2004,25(2):178~184Xu Zi-Guo,Song Er-Xiang.Finite Element Analysis for Seismic Response of Rigid Pile Composite Foundations[J].Rock and Soll Mechanics,2004,25(2):178~184(in Chinese)
    [7]葛忻声,龚晓南.长短桩复合地基有限元分析及设计计算方法探讨[J].建筑结构学报,2003,24(4):91~96Ge Xin-sheng,Gong Xiao-nan.FEM Analysis and Design of Long-short-pile Composite Foundation[J].Journal of Building Structures,2003,24(4):91~96(in Chinese)
    [8]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010Fei Hong,Zhang Jian-wei.ABAQUS in Geotechnical Engineering[M].Beijing:China Water Power Press,2010(in Chinese)
    [9]陈兴国.岩土工程地震学[M].北京:科学出版社,2007Chen Xing-guo.Geotechnical Engineering Seismology[M].Beijing:Science Press,2007(in Chinese)
    [10]JGJ94-2008,建筑桩基础技术规范[P]JGJ94-2008,Technical Code for Building Pile Foundations[P](in Chinese)
    [11]龚晓楠.复合地基理论及工程应用[M].北京:中国建筑工业出版社,2007Gong Xiao-nan.Composite Foundation Theory and Engineering Application[M].Beijing:China Architecture&Building Press,2007(in Chinese)

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