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时间:2020-04-19
《钢管-水泥土组合桩的抗拔性能.pdf》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、第24卷第3期黑龙江科技大学学报Vol_24No.32014年5月JournalofHeilongjiangUniversityofScience&TechnologyMav2014钢管一水泥土组合桩的抗拔性能冯建光,何英萍(苏州大学城市轨道交通学院,江苏苏州215137)摘要:针对传统抗拔桩承载能力的局限性,根据劲性搅拌桩施工及荷载传递特点,提出钢管一水泥土组合抗拔桩形式,并借助ANSYS数值模拟软件,分析钢管直径及壁厚对组合桩承载能力及破坏模式的影响。结果表明:钢管直径对组合桩的抗拔性能影响显著。钢管直径小于0.4m时组合桩的承载力增幅很大,达
2、到0.4m时承栽力接近极限值:铜管直径为0.3~0.4m时组合桩破坏模式较合理。钢管壁厚对组合桩的抗拔性能影响较小。壁厚为10mm时组合桩的极限承载力增幅较大,钢管壁厚宜取10mm。钢管壁厚不影响组合桩的破坏模式,破坏均发生在钢管与外桩界面。该研究为改善水泥土搅拌桩的抗拔性能提供了参考。关键词:钢管一水泥土组合桩;抗拔性;有限元doi:10.3969/j.issn.2095-7262.2014.03.018中图分类号:TU473.1文章编号:2095—7262(2014)03—0306—06文献标志码:AEffectofsteelpipeonwit
3、hdrawalresistancecapacityofsteel-cementcompositepileFENGJianguang,HEYingping(SchoolofUrbanRailTranspotration,SoochowUniversity,Suzhou215137,China)Abstract:Aimedataddressingthelimitedbearingcapacityinherentinconventionalupliftpiles,thispaperproposesasteel—cementcompositepile,an
4、ewcombinationbuildingonthebehaviorofstruc—tureandloadtransferinreinforcedmixingpiles.Thepapergoesfurtherintoananalysisoftheeffectsofsteelpipediameterandthicknessonthecompositepilebearingcapacityandfailuremodes,usingnu—mericalsimulationsoftwareANSYS.Theanalysisfindsthatsteelpip
5、ediameterexertsasignificanteffectonthewithdrawa1resistancebehaviorofcompositepiles.asisdemonstratedwhenasteelpipewithadi—ameteroflessthan0.4m,providesasignificantincreaseinbearingcapacityofcompositepiles;asteelpipewithadiameterofupto0.4mgivescompositepilesthebearingcapacityclo
6、setothelimit;andasteelpipewithadiameterrangingfrom0.3to0.4maffordsamorereasonablefailuremode.Pipewallthicknesshasalesseffectonwithdrawalresistanceperformance,asisevidencedbythefactthata10am—thickpipewallprovidesagreaterincreaseintheultimatebearingcapacity,suggestingthatapipewa
7、llthicknessissettobe10mm.Pipewallthicknessproducesnoeffectonthefailuremode,duetothedamageoccurringonlyintheinterfacebetweensteelpipeandtheouterpile.Thispapermayserveasareferenceforimprovingtheperformanceofreinforcedcompositepile.Keywords:steel—cementcompositepile;withdrawalres
8、istance;finiteelement抗拔桩即承受上拔力的桩基,是桩基础的重要的加快,建(构)筑物承受上拔力的情况越来
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