竖向力下各型群桩-层状土体的水平阻抗效应

英文篇名：Lateral Resistance Effect of Various Soil-Pile-Groups Under Vertical Force
中文刊名：地下空间与工程学报
英文刊名：Chinese Journal of Underground Space and Engineering
作者：熊辉 ; 吕西林
英文作者：XIONG Hui~(1 ; 2) ; LU Xi-lin~1(1.Research Institute of Structural Engineering and Disaster Reduction ; Tongji University ; Shanghai 200092 ; P.R.China ; 2.Department of Civil Engineering ; Hunan University ; Changsha 410082 ; P.R.China)
中文关键词：轴、横向相互作用 ; 群桩构型 ; 群桩效应 ; 水平动力阻抗
英文关键词：axial and lateral loads interaction ; allocation of piles ; pile-group effects ; horizontal dynamic resistance
出版日期：2006-04-30
机构：同济大学结构工程与防灾研究所,同济大学结构工程与防灾研究所上海200092,湖南大学土木工程学院,长沙410082,上海200092
年：2006
期：02
出版单位：地下空间与工程学报

摘要

提出了分层地基中考虑轴向力参与作用下群桩水平阻抗的分析方法,进一步揭示了群桩-土相互作用的振动特性,拓展了桩基阻抗简化法的应用范围。群桩动力反应不等同于其独立单桩的简单叠加,其频率阻抗曲线形状与桩数、竖向力、土层属性、桩间距有关,受布桩型式的影响最大,随桩距径比的增大群桩效应有衰减趋势;桩顶轴力的存在使群桩水平反应与单一水平力作用时有明显差异,增大了群桩水平变位。
A method for analysing lateral dynamic resistance of pile-groups is presented considering the participation of axial loads on pile-head in layered-soil and the vibration characteristic of soil-pile-groups is further revealed to extend the application scope of simplified pile-resistance method.The dynamic frequency-dependent response of pile-groups is characterized by random configuration,pile number,soil properties and interval between piles,instead of the simple addition of each single-pile resistance.The pile-group effect is mostly affected by allocation type of piles and will attenuate with the increase of R/D ratio between piles.In addition,the corresponding dynamic with vertical loads is obviously different from that under pure lateral excitation,which results in augments of lateral responses of pile-groups.

引文

[1][日]横山幸满著.桩结构物的计算方法和计算实例[M].唐业清,吴庆荪译.北京:中国铁道出版社,1984.45~83
    [2]Poulos,.H.G.and Davis,E.H.,Pile Foundation Analysisand Design[M],New York,John Wiley,1980
    [3]H.El-Marsafawi,Y.C.Han,M.Novak.Dynamic experi-ments on two pile groups[J].Journal of Geotechnical Engi-neering,ASCE,1992,118(4):576~592
    [4]R.Dobry,G.Gazetas.Simple method for dynamic stiffnessand damping of floating pile groups[J].Géotechnique,1988,38(4):557~574
    [5]宋亚新,蒋通,楼梦麟.桩基-非线性框剪结构相互作用体系(上)-群桩阻抗函数的求取[J].地震工程与工程振动,1999,19(2):56~63
    [6]N.Makris,D.Badoni.Seismic response of pile groups underoblique-shear and rayleigh waves[J].Earthquake Engi-neering and Structural Dynamics,1995,24(5):517~532
    [7]Novak,M.,Nogami.T.,and Aboul-Ella.Dynamic soil re-actions for plane strain case[J].Journal of the Engineer-ing Mechanics Division,ASCE,1978,104(4):953~969