多元复合地基的等效本构模型及三维地震响应研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
按照复合材料力学的处理方法将多元复合地基的桩-土体系作等效连续化处理,将其视为横观各向同性体,首次建立了多元复合地基桩土等效复合体的本构关系;基于大型有限元软件ABAQUS操作平台,采用有限元、无限元耦合的方法研究了多元复合地基的三维地震响应,结果表明:(1)等效复合体模型能很好地反映出多元复合地基的传力机理.(2)天然地基、多元复合地基和基础在地表的加速度傅氏谱均呈多峰型,对输入地震波均有滤波作用,且多元复合地基和基础的滤波作用更为显著.(3)褥垫层、筏板的增加能有效抑制地表加速度响应,但并非越厚越好,还要考虑建造的经济性.计算结果可为工程抗震设计提供参考.
The equivalent continuous processing is done to multi-element composite foundation by composite material mechanics method,the composite foundation is studied as transversely isotropic body,and the constitutive relation of equivalent complex is established at first time.On the ABAQUS platform,the three direction seismic responses of multi-element composite foundation are studied by finite-infinite element coupling method.The results show that:(1) the model of equivalent complex can reflect the working mechanics of the multi-element composite foundation;(2)The accelerations fourier spectrum at earth surface of natural foundation,multi-element composite foundation and ground are multi-peak types,and all of them have filter action to input earthquake wave,and the actions of multi-element composite foundation and ground are stronger than that of the natural foundation,and the(3) cushion and raft can limit the acceleration responses at earth surface,but the effect does not increase with the depth of cushion and raft.The economical efficiency should be considered too.The results can provide reference for the seismic design of engineering.
引文
[1]龚晓南.复合地基[M].杭州:浙江大学出版社,1992.GONG Xiao-nan.Composite Foundation[M].Hangzhou:Zhejiang University Press,1992.
    [2]郑俊杰,张建平.CFG桩与石灰桩联合处理不均匀地基[J].施工技术,2000(9):31-32.ZHENG Jun-jie,ZHANG Jian-ping.CFG pile and lime pile joint processing uneven foundation[J].Construction technology,2000(9):31-32.
    [3]MAHESHWARI Bal Krishna,TRUMAN Kevin Z,EI Naggar M Hesham,et al.Three-dimensional finite element nonlinear dynamic analysis of pile groups for lateral transient and seismic excitations[J].Canadian Geotechnical Journal,2004,41(1):118-133.
    [4]XU Z G,SONG E X.Finite element analysis for seismic response of rigid pile composite foundations[J].ROCK AND SOIL MECHANICS-WUHAN,2004,25(91):179-185.
    [5]GE Xin-sheng,GONG Xiao-nan.Introduction about the design of the long-short-pile composite foundation[J].Building structure,2002,32(7):3-4.
    [6]XIE Kang-he,LU Meng-meng,HU An-feng,et al.A general theoretical solution for the consolidation of a com-posite foundation[J].Computers and Geotechnics,2009,36(1):24-30.
    [7]ZHOU Q c,LI H b,LIU Y q.Treatment of pile foundation accident with replacement Method and rigid pile com-posite foundation[J].ROCK AND SOIL MECHANICS-WUHAN,2003,24(86):845-849.
    [8]郑俊杰,区建华,吴世明.多元复合地基的理论与实践[J].土木工程学报,2002,24(2):208-212.ZHENG Jun-jie,QU Jian-hua,WU Shi-ming.Theory and practice of multivariate composite foundation[J].China civil engineering journal,2002,24(2):208-212.
    [9]葛忻声,温育琳,龚晓南.刚柔组合桩复合地基的沉降计算[J].太原理工大学学报,2002,33(6):647-649.GE Xin-sheng,WEN Yu-lin,GONG Xiao-nan.Settlement calculation of firm soft composite pile composite founda-tion[J].Taiyuan university of science and technology journal,2002,33(6):647-649.
    [10]杨景龙,丁璐.长短桩复合地基数值分析[J].四川建筑科学研究,2002,28(4):38-40.YANG Jing-long,DING Lu.The length of pile composite foundation numerical analysis[J].Sichuan building sci-entific research,2002,28(4):38-40.
    [11]张俊发,黄瑜,闻建军,等.群桩基础的复合体模型建立与应用[J],岩土工程学报,2006,28(9):1064-1069.ZHANG Jun-fa,HUANG Yu,WEN Jian-jun,et al.The complex model establishment and application of pile group foundation[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1064-1069.
    [12]Hibbitt,Karlsson,Sorensen.ABAQUS/Standard Users Manual[M].American:HKS Company,2002.
    [13]ZIENKIEWICZ O C.The generalized finite element method–state of the art and future directions[J].Transac-tions of theASME,1983,50:1210-1217.
    [14]崔俊芝,梁俊.现代有限元软件方法[M].北京:国防工业出版社,1995.CUN Jun-zhi,LIANG Jun.The software method of modern finite element[M].Beijing:national defense industry press,1995.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心