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时间:2020-05-04
《成层地基中单桩受扭弹塑性分析-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷第9期湖南大学学报(自然科学版)Vo1.41,No.92O14年9月JournalofHunanUniversity(NaturalSciences)Sep.2014文章编号:1674—2974(2014)09—0072—07成层地基中单桩受扭弹塑性分析邹新军,徐洞斌,王亚雄(湖南大学土木工程学院,湖南长沙41O082)摘要:为了探讨成层地基中单桩的受扭性状,基于桩侧土双折线模型,以塑性区开展深度为变量,推导了桩侧土分别处于弹性和塑性状态时桩顶的扭矩一扭转角曲线和桩身扭矩、扭转角分布曲线的递推计算方法,并编制出相应的计算程序,由此对比分析了单
2、层与双层地基中桩身的受扭性能.最后,结合工程算例进行了应用,并完成了参数分析.结果表明:考虑桩侧土分别处于弹性和塑性状态所得结果更符合工程实际;桩顶扭矩丁一定时,桩顶扭转角随桩身材料剪切模量G和半径FO的增加而减小;r0对T一曲线影响显著,同等条件下r。提高一倍,桩顶抗扭承载力提高4~6倍;可对桩周上部土层进行处理来提高桩身抗扭性能,其有效处理厚度为桩长的0.2倍.关键词:桩基础;成层地基;扭矩荷载;荷载传递法;双折线模型中图分类号:TU472.3文献标识码:AElastic——plasticAnalysisofTorsionalSinglePile
3、inLayeredSubsoilZOUXin—jun’,XUDong—bin,WANGYa—xiong(CollegeofCivilEngineering。HunanUniv,Changsha,Hunan410082。China)Abstract:Inordertodiscussthetorsionalbehaviorofsinglepileinlayeredsubsoil,variousbearingstates(elasticandplastic)ofthesubsoi1wereconsidered,andthedoublebroken1inem
4、odel(i.e.,theide—alelastoplasticmode1)wasusedtosimulatetheloadtransferringlawalongthepileshaft.Theplasticzone,developmentaldepthinthesubsoilwaschosenasanindependentvariabletoderivethesolutionsforthetorque--twistanglecurveatthepiletopandthetorque。angledistributioncurvesalongthep
5、ileshaftinlay‘·eredsubsoil.Arecursivealgorithmwaspresentedtocalculatethetorqueandthetwistanglewiththecom—puterprogramworkedoutaswel1.Basedonthesolutionsobtained,thetorsionalbehaviorofthepileshaftinthesingle—layerandthedouble—layersubsoilwasanalyzedrespectively.Finally,anenginee
6、ringprojectwasusedtoverifythepresentmethodandtocarryouttheparameteranalysis.Theresultshowsthattheconsiderationofvariouselasticorplasticstatesofthesubsoilwillresultinamorereasonableoutcome,comparedwithengineeringpractice.Furthermore,foraconstanttorqueT,thetorsionanglesatthepilet
7、opwilldecreasewiththedecreaseoftheshearmodulusG。andradiusroofpileshaft.Anobviouseffectofr0ontheT一curvewasobserved,inwhichthetorsionalbearingcapacitymaybeincreased4~6timesifthevalueofr0wasdoubledandotherconditionsremainedunchanged.Theuppersoil1ayermaybetreated收稿日期:2014:03-03基金项目
8、:国家自然科学基金资助项目(51378197)作者简介:邹新军(1975一),男,湖南湘阴人,湖南大学副教授
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