偏心距对水平受荷双桩基础响应影响

《偏心距对水平受荷双桩基础响应影响》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、偏心距对水平受荷双桩基础响应影响孔令刚1，2，顾明1，2，陈仁朋1，2，陈云敏1，2(1.浙江大学岩土工程研究所，浙江杭州310058；2.浙江大学软弱土与环境土工教育部重点实验室，浙江杭州310058)摘要：通过双桩基础的大比尺模型试验研究水平偏心荷载下基桩的受力变形性状；采用ABAQUS数值模型分析荷载偏心对双桩基础工作性状的影响。研究表明，双桩基础水平荷载–承台水平位移曲线与水平单桩曲线变化规律相同，荷载偏心对双桩基础水平变形有一定影响，水平刚度随偏心距增加而降低；水平偏心荷载导致双桩基础中基桩桩头剪力不均匀，接近加载点的基桩桩头剪力最大，随偏心距增加基桩桩头剪力与运

2、动方向出现相反的情况；水平和扭转荷载耦合使基桩扭转刚度较单桩明显增加，但偏心距增加使该耦合效应影响减小；基桩扭转反力对抵抗外加扭矩的贡献随着水平荷载增加减小。关键词：桩基础；水平偏心荷载；大尺寸模型试验；数值模拟中图分类号：TU473文献标识码：A文章编号：1000–6915(2013)增2–4174–09INFLUENCEOFECCENTRICITYONTWO-PILEFOUNDATIONSUBJECTEDTOLATERALLOADINGKONGLinggang1，2，GUMing1，2，CHENRenpeng1，2，CHENYunmin1，2(1.Instituteof

3、GeotechnicalEngineering，ZhejiangUniversity，Hangzhou，Zhejiang310058，China；2.KeyLaboratoryofSoftSoilsandGeoenvironmentalEngineeringofMinistryofEducation，ZhejiangUniversity，Hangzhou，Zhejiang310058，China)Abstract：Alargescalemodeltestoftwo-pilefoundationinsaturatedsiltiscarriedouttoinvestigatet

4、heresponseundereccentriclateralloading.AnABAQUSnumericalmodelisbuiltandvalidatedbythemodeltestresult.Theeffectofeccentricityofappliedlateralloadingonthebehaviorofthefoundationisfurtherstudiedusingthevalidatedmodel.Itisfoundthattheappliedload-horizontaldisplacementcurvesofthepilecapofthetwo

5、-pilefoundationareclosetoalaterallyloadedsinglepilecurveinshape.Thelateralstiffnessdecreaseswiththeincreasingeccentricityoftheappliedload.Eccentricitycaninducesignificantdifferenceinpile-headshearingbetweenthetwopiles.Thepilenexttotheloadpointundertakesmoreshearforceandthepile-headshearres

6、istanceofanotherpilecanbeoppositetoitsdisplacementindirectionunderacertaineccentricity.Thetorsionalrigidityoftheindividualpilesisfargreaterthanthatofacorrespondingsinglepilesubjectedtotorsionbecauseofthedeflection-torquecouplingeffectinthepiles，buttheinfluenceofthecouplingeffectdecreaseswi

7、ththeincreasingeccentricity.Bothtorsionalandlateralresistancesoftheindividualpilescontributetoresisttheappliedtorque；andthecontributionoftorsionalresistancesoftheindividualpilestotheappliedtorquesignificantlydecreaseswiththeincreasingappliedload.Keywords：pilef