欢迎来到天天文库
浏览记录
ID:27553596
大小:58.62 KB
页数:4页
时间:2018-12-04
《层状地基与弹性薄板相互作用的边界元解》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、层状地基与弹性薄板相互作用的边界元解摘要:将无限大薄板的基本解作为薄板边界积分方程的核函数,对薄板的内部和边界进行离散,并假定薄板内部和边界上的节点与地基反力的分布情况,得到薄板的边界元方程组;同时基于层状地基的解析层元解,通过Guass-Legendre积分得到地基柔度矩阵;结合地基与薄板接触面上的位移协调条件,得到层状地基与薄板共同作用问题总的边界元法方程组;求解该方程组,得到层状地基与薄板共同作用问题的解答.基于本文理论,编制了相应的FORTRAN程序,通过与己有文献结果对比验证本文理论及程序的正确性,数值分析结果表明:方形基础薄板情况下,离板中心越近,垂直于坐标轴y方向、距离
2、相等的2条线段的竖向位移差越小,且该位移差随着板-土刚度比减小而减小;随着板长宽比的增大,板中心点与长边中点位移差变化不明显,而短边中心与边界角点的位移差也有相类似的规律.关键词:边界元;层状地基;薄板;解析层元中图分类号:TU443文献标志码:A文章编号:1674-297403-0120-06DOI:10.16339/j.cnki.hdxbzkb.2017.03.015Abstract:Thekernelfunctionsoftheboundaryintegralequationsforthinplateweredeterminedbythefundamentalsolutions
3、foraninfinitethinplate.Bythediscretizationoftheplateinteriorandboundaryaswellastheassumptionofthedistributionstatesofplatenodesandfoundationreactionforces,theBEMequationsoftheplatecanbeestablished.Meanwhile,basedontheanalyticallayerelementsolutionsforlayeredfoundations,theflexibilitymatrixofthe
4、foundationwasobtainedbyatwo-dimensionedGuass-Legendrequadrature.Takingintoaccountthecompatibleconditionsofthedisplacementsatthesoils-plateinterface,theglobalBEMequationsfortheinteractionproblembetweenthelayeredfoundationandthethinplatewerethenestablished.Thesolutionsfortheproblemwerefurtherobta
5、inedbysolvingtheglobalBEMequations.TheaccuracyofthepresentmethodwasverifiedbycomparingexistingsolutionswiththenumericalresultsobtainedfromthecorrespondingFORTRANprograminthisstudy.Itisobservedfromnumericalexamplesthatwhenasquarethinplateisplacedonafoundation,thesettlementdifferencebetweenthetwo
6、linesperpendiculartoyorxcoordinatedecreasesastheyapproachthecenteroftheplate,andthedifferencedecreaseswiththedecreaseoftheplate-soilstiffnessratio.Furthermore,thesettlementdiscrepancybetweentheplatecenterandthemidpointofthelongsideisunapparentwiththeincreasinglength-widthratio,andthesimilarvari
7、ationtrendcanbefoundbetweenthemidpointofthewidesideandangularpoint.Keywords:boundaryelement;layeredsoils;thinplates;analyticallayerelement筏板基命A具有刚度大、整体性好、能较好地抵抗不均匀沉降的优点,因此在高层建筑中得到了广泛的应用.目前,地基与板相互作用分析的方法主要有:有限差分法[1]、有限单元法[2-4]、边界单元
此文档下载收益归作者所有