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1、學(xué)兔兔www.xuetutu.com第35卷第3期JournalofCivil.土Arc木hit建ect筑ura與l&環(huán)En境vir工on程mentalEngineeringVo1.35No.32013年6月Jun.2013doi:10.11835/j.issn.1674-4764.2013.03.014混雜纖維高性能混凝土深梁的剪切延性劉勝兵,徐禮華(1.武漢工程大學(xué)環(huán)境與城市建設(shè)學(xué)院,武漢430074;2.武漢大學(xué)土木建筑工程學(xué)院,武漢430072)摘要:采用正交設(shè)計(jì)法對18組混雜纖維高性能混凝土(HPC)深梁和2組普通高性能
2、混凝土深梁進(jìn)行受剪試驗(yàn),通過定義剪切延性指標(biāo)對深梁的剪切延性進(jìn)行定量分析,利用直觀分析法比較了鋼纖維外形、鋼纖維體積率、鋼纖維長徑比、聚丙烯纖維體積率、水平分布鋼筋配筋率、豎向分布鋼筋配筋率等因素對深梁剪切延性的影響。結(jié)果表明,鋼纖維體積率對深梁剪切延性影響最大,超過了水平分布鋼筋和豎向分布鋼筋的作用,鋼纖維外形的影響最小?;祀s纖維的摻入顯著提高了深梁的剪切延性,最大提高達(dá)4O.7,但仍達(dá)不到延性破壞的要求,不足以從破壞形態(tài)上根本改變深粱剪切破壞時的脆性。運(yùn)用有限元軟件ABAQUS對深梁受剪行為進(jìn)行全過程分析,數(shù)值分析結(jié)果與試驗(yàn)結(jié)
3、果吻合良好。關(guān)鍵詞:混雜纖維;高性能混凝土;深梁;剪切;延性;有限元分析中圖分類號:TU375;TU528文獻(xiàn)標(biāo)志碼:A文章編號:1674—4764(2013)03—0088—07ShearDuctilityofHybridFiberReinforcedHighPerformanceConcreteDeepBeamsLiuShengbing,XuLihua。(1.SchoolofEnvironmentandCivilEngineering,WuhanInstituteofTechnology,Wuhan430074,PR.Chin
4、a:.2.SchoolofCivilEngineering,WuhanUniversity,Wuhan430072。P.R.China)Abstract:Thesheartestswereconductedon18differentgroupsofdeepbeamswithstee1fiberandpolypropylenefiberandtwogroupshighperformanceconcretedeepbeamswithoutfiberaccordingtotheorthogonalexperimentaldesign.B
5、yadefinitionofshearductilityindexshearductilityofdeepbeamswasanalyzedquantitatively.Theinfluenceofsixfactorsonimprovingshearductilityofdeepbeamswascomparedbydirect—viewinganalysisoftheorthogonalexperiment.Thecontributoryfactorssuchasthespeciesofsteelfiber,thevolumefra
6、ctionofsteelfiber,thelength/diameteraspectratioofsteelfiber,thevolumefractionofpolypropylenefiber,theratioofwebhorizontalreinforcementandtheratioofwebverticalreinforcementwereanalyzed.Resultsshowthatthevolumefractionofsteelfiberplaysthemostimportantroleinimprovingshea
7、rductilityofdeepbeamsexceedingtheratioofwebhorizontalreinforcementandtheratioofwebverticalreinforcement,whereasspeciesofsteelfiberhasminimumeffect.Hybridfibercanbeusedtogreatlyincreaseshearductilityofdeepbeamsandshearductilityisatthemostincreasedby40.70Aalthoughitcann
8、otchangethebrittlenessofsheardamage.Thefull—rangeshearbehaviorsofdeepbeamsthroughABAQUSareanalyzedandthecalculatedresultsare