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时间:2019-05-11
《CFRP_圆钢管自密实混凝土复合加固RC方形短柱轴压性能试验研究_卢亦焱_沈炫》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48卷第11期土木工程学报Vol.48No.112015年11月CHINACIVILENGINEERINGJOURNALNov.2015CFRP-圆钢管自密实混凝土复合加固RC方形短柱轴压性能试验研究卢亦焱沈炫何楂李娜(武汉大学,湖北武汉430072)摘要:提出CFRP-圆钢管自密实混凝土加固钢筋混凝土柱的复合加固方法。通过1根钢筋混凝土方形截面短柱和9根复合加固钢筋混凝土方形截面短柱的轴压试验,研究了CFRP-钢管自密实混凝土复合加固混凝土方形截面短柱的轴压性能,分析了CFRP层数、钢管壁厚对复合加固短柱的承载力、刚度和延性
2、的影响。试验结果表明:随着CFRP层数的增大,复合加固柱的承载力和弹塑性阶段刚度显著提高;随着钢管壁厚的增大,复合加固柱刚度和延性显著提高;在其他条件相同的情况下,复合加固柱承载力的提高率将随钢管壁厚的增大而减小;当承载力提高幅度相同时,使用CFRP复合加固可以降低钢管壁厚,有效减少用钢量。在试验研究的基础上,建立了复合加固钢筋混凝土方形截面短柱的承载力计算公式,计算结果与试验结果吻合良好。关键词:CFRP-钢管;复合加固;短柱;轴压性能中图分类号:TU375.3文献标识码:A文章编号:1000-131X(2015)11-000
3、1-08DOI:10.15951/j.tmgcxb.2015.11.002ExperimentalstudyonthebehaviorofRCsquareshortcolumnsstrengthenedwithself-compactingconcretefilledCFRP-steeltubeunderaxialcompressionLuYiyanShenXuanHeChaLiNa(WuhanUniversity,Wuhan430072,China)Abstract:Acompositestrengtheningmethod,
4、inwhichtheRCcolumnsstrengthenedwithself-compactingconcretefilledCFRP-steeltube,wasproposed.BasedononeRCsquarecolumnandninecompositelystrengthenedRCsquarecolumns,theirbehaviorsundertheaxialloadingwerestudied,andtheinfluencesofCFRPlayersandthewallthicknessofsteeltubeon
5、thebearingcapacity,stiffnessandductilityofthecompositelystrengthenedshortcolumnswereanalyzed.TheresultsindicatethatwiththeincreaseofCFRPlayers,significantincreasesinboththestiffnessatelasto-plasticstageandthebearingcapacityofcompositelystrengthenedcolumnscanbeobserve
6、d;withtheincreaseofwallthicknessofsteeltube,significantincreasesinthestiffnessandductilityofcompositelystrengthenedcolumnsexhibitedcanalsobeseen;withthesameotherconditions,theincreasingratioofbearingcapacityofcompositelystrengthenedcolumnsmaydecreasewiththeincreaseof
7、wallthicknessofsteeltube;forthesameincreasingrate,thewallthicknessofsteeltubecanbeeffectivelyreducediftheCFRPcompositestrengtheningmethodisapplied.Basedontheresults,aformulawasproposedtocalculatethebearingcapacityofthecompositelystrengthenedshortcolumns,andthecalcula
8、tionresultsagreewellwiththeexperimentalresults.Keywords:CFRP-steeltube;compositestrengthening;shortcolumn;axialcompressionperforman
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