上部结构-桩筏基础-地基相互作用有限元分析
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摘要
为了研究结构-桩-土的相互作用,利用有限元程序对上部结构-桩筏基础-地基相互作用体系建立了三维有限元分析模型.通过计算分析并与常规设计作了比较,对两种情况下上部结构的内力变化作了探讨.结果表明:筏板发生"盆型"变形,上部结构的梁、柱内力都发生了重分布:即四个角柱轴力增大,边柱和内部柱都出现卸荷现象;柱端弯矩最大值和梁端弯矩最大值都出现在最底层.计算中土体、桩、筏、结构等材料都取弹性范围分析.
In order to study the interaction of upper structure,pile raft foundation and soil,a modle of three dimensional finite element analysis is established.A general purpose finite elements program is adopted in the computation.The internal force change in upper structure is investigated using conventional method and interactional analysis method.The analysis results indicate that the displacement distribution of the raft looks like a dish,the internal force distribution of columniations and beams is different,the axial force of four corner columniations increases while the axial force of border columniations and interior columniations reduces,the maximum bending moment of the columniations and beams appears on the ground floor.For computational analysis,deformation of soil,pile,raft and structure are all in elastic range.
In order to study the interaction of upper structure,pile raft foundation and soil,a modle of three dimensional finite element analysis is established.A general purpose finite elements program is adopted in the computation.The internal force change in upper structure is investigated using conventional method and interactional analysis method.The analysis results indicate that the displacement distribution of the raft looks like a dish,the internal force distribution of columniations and beams is different,the axial force of four corner columniations increases while the axial force of border columniations and interior columniations reduces,the maximum bending moment of the columniations and beams appears on the ground floor.For computational analysis,deformation of soil,pile,raft and structure are all in elastic range.
引文
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[11]中华人民共和国行业标准编写组．建筑地基基础设计规范(GB50007-2002)[S]．北京：中国建筑工业出版社，2002．The Professional Stands Compilation Group of Peo- ple's Republic of China.Code for Building's Foun- dations(GBS0007-2002) [S].Beijing:China Architec- ture and Building Press,2002.(in Chinese)
[2]周翠英，谭祥韶，李德福，等．动静荷载综合作用下桩土相互作用的机理研究[J]．中山大学学报：自然科学版，2001，40(4)：96．ZHOU Cui-ying,TAN Xiang-shao,LI De-fu,et al. Research on the Mechanism of Interaction Between Piles and Soil Layers Under the Dynamic and Static Loads[J].Acta Seientiarum Naturalium Unviversita- tis Sunyateseni:Natural Science Edition,2001,40(4): 96.(in Chinese)
[3]张建辉，邓安福．桩筏基础的新型分析方法[J]．土木工程学报，2002，35(4)：102．ZHANG Jian-hui,DENG An-fu.A New Analytical Method for Piled Raft Foundation[J].China Civil En- gineering Journal,2002,35(4):102.(in Chinese)
[4]钟闻华，张克恭，刘松玉．天然地基上的筏板基础受力及变形分析[J]．中山大学学报：自然科学版，2002，41(2)：101．ZHONG Wen-hua,ZHANG Ke-gong,LIU Song-yu. Analysis of Behavior of the Rafts' Deformation and Interior Force on Natural Subsoil[J].Acta Scientia- rum Naturaliurn Unviversitat is Sunyateseni:Natural Science Edition,2002,41 (2):101.(in Chinese)
[5]严平，龚晓南．桩筏基础在上下部相互作用下的极限分析[J]．土木工程学报，2000，33(2)：86．YAN Ping,GONG Xiao-nan.Limit Analysis of Pile- raft Foundation on Interaction Between Superstruc- ture and Base[J].China Civil Engineering Journal, 2000,33(2):86.(in Chinese)
[6]陈云敏，陈仁朋，凌道盛．考虑相互作用的桩筏基础简化分析法[J]．岩土工程学报，2001，23(6)：685．CHEN Yun-min,CHEN ren-peng,LING Dao-sheng. A Simplified Method to Analyze Soil-pile-raft Interac- tions[J].Chinese Journal of Geotechnical Engineer- ing,2001,23(6):685.(in Chinese)
[7]蔡红．空间框架-厚筏-土介质相互作用分析[J]．浙江大学学报：自然科学版，1997，31(3)：386．CAI Hong Interaction Analysis of Space Frame-thick Piles-soil Medium[J].Journal of Zhejiang University: Natural Seienee Edition,1997,31(3):386.(in Chinese)
[8]刘前曦，侯学渊，章旭昌．筏-桩-土相互作用分析方法[J]．同济大学学报，1996，24(6)：624．LIU Qian-xi,HOU Xue-yuan,ZHANG Xu-chang.Analy- zing Method for Raft-piles-soil Interaction[J].Journal of Tongji University,1996,24(6):624.(in Chinese)
[9]Poulus H G.An Approximate Numerical Analysis of Pile-raft Foundation[J].International Journal for Nu- merical and Analytic Methods in Geomechanics, 1994,18:73.
[10]Boulon M,Nova R.Modeling of Soil Structure Inter- face Behavior-comparison Between Elastoplastic and Rate-type Laws [J].Computers and Geotechnics, 1990,9(1):21.
[11]中华人民共和国行业标准编写组．建筑地基基础设计规范(GB50007-2002)[S]．北京：中国建筑工业出版社，2002．The Professional Stands Compilation Group of Peo- ple's Republic of China.Code for Building's Foun- dations(GBS0007-2002) [S].Beijing:China Architec- ture and Building Press,2002.(in Chinese)
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