资源描述：
《考虑土体屈服的纵横荷载单桩变形内力分析_张磊》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、第32卷第8期岩土力学Vol.32No.82011年8月RockandSoilMechanicsAug.2011文章编号：1000－7598(2011)08－2441－06考虑土体屈服的纵横荷载单桩变形内力分析1,222张磊，龚晓南，俞建霖（1.西安建筑科技大学土木工程学院，西安710055；2.浙江大学软弱土与环境土工教育部重点试验室，杭州310058）摘要：为提高桩身变形较大时纵横荷载单桩的设计计算水平，假定地基反力系数沿深度线性增加，考虑土体屈服及纵向荷载的P-Δ效应并计入桩身自重和桩侧摩阻力的影响，得到了地
2、面以下桩身变形和内力的幂级数解。结合已有的地面以上桩身响应的幂级数解，采用Fortran语言编制了计算程序。计算结果表明：桩顶位移、地面处桩身位移及桩身最大弯矩均随纵横向荷载和自由段桩长的增加而增大，并随土体屈服位移的增加而减小；纵向荷载足够大时桩基失稳；桩顶约束条件对桩的响应影响很大。计算值与模型试验的实测值吻合较好，所得解和程序是可靠的。关键词：桩-土相互作用；纵横荷载；屈服；弯矩；幂级数解中图分类号：TU473文献标识码：AAnalysisofdeformationandinternalforceforsin
3、glepileundercombinedverticalandlateralloadsconsideringyieldingofsoil1,222ZHANGLei,GONGXiao-nan,YUJian-lin(1.SchoolofCivilEngineering,Xi’anUniversityofArchitectureandTechnology,Xi’an710055,China;2.KeyLaboratoryofSoftSoilsandGeoenvironmentalEngineering,Ministryo
4、fEducation,ZhejiangUniversity,Hangzhou310058,China)Abstract:Inordertoimprovethedesignandcalculationofsinglepilesundercombinedverticalandlateralloadswhenthepiledeformationiscomparativelygreat,consideringtheP-Δeffect(withthemeaningofverticalloadcanmagnifythedefo
5、rmationinducedbylateralload)causedbyverticalloadandyieldofsoil,deadweightofthepile,andskinfrictionofthepileside,assumingthatthecoefficientofsubgradereactionincreaseslinearlywithdepth,thepowerseriessolutionsofthedeformationandinternalforceforthepileshaftundergr
6、oundsurfaceareobtained.Combiningthepre-existingpowerseriessolutionsforthepileshaftaboveground,therelevantcomputerprogramisdevelopedbyFortranlanguage.Thecalculationresultsindicatethatthedisplacementsatthepileheadandthegroundsurface,andthemaximumbendingmomentinc
7、reasewhentheverticalandlateralloads,andthepilelengthabovegroundincrease;anddecreasewhentheyielddisplacementofsoilincreases.Theverticalloadmaycausetheinstabilityproblemforthepile.Theboundaryconditionatthepileheadplaysanimportantroleinpileresponses.Thecomputedan
8、dthemodeltestresultsareingoodagreement,meaningthattheobtainedsolutionsandprogramaredependable.Keywords:pile-soilinteraction;combinedverticalandlateralloads;yielding;bendingmoment;p
