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时间:2019-03-02
《混杂纤维高性能混凝土深梁的剪切延性》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com第35卷第3期JournalofCivil.土Arc木hit建ect筑ura与l&环En境vir工on程mentalEngineeringVo1.35No.32013年6月Jun.2013doi:10.11835/j.issn.1674-4764.2013.03.014混杂纤维高性能混凝土深梁的剪切延性刘胜兵,徐礼华(1.武汉工程大学环境与城市建设学院,武汉430074;2.武汉大学土木建筑工程学院,武汉430072)摘要:采用正交设计法对18组混杂纤维高性能混凝土(HPC)深梁和2组普通高性能
2、混凝土深梁进行受剪试验,通过定义剪切延性指标对深梁的剪切延性进行定量分析,利用直观分析法比较了钢纤维外形、钢纤维体积率、钢纤维长径比、聚丙烯纤维体积率、水平分布钢筋配筋率、竖向分布钢筋配筋率等因素对深梁剪切延性的影响。结果表明,钢纤维体积率对深梁剪切延性影响最大,超过了水平分布钢筋和竖向分布钢筋的作用,钢纤维外形的影响最小。混杂纤维的掺入显著提高了深梁的剪切延性,最大提高达4O.7,但仍达不到延性破坏的要求,不足以从破坏形态上根本改变深粱剪切破坏时的脆性。运用有限元软件ABAQUS对深梁受剪行为进行全过程分析,数值分析结果与试验结
3、果吻合良好。关键词:混杂纤维;高性能混凝土;深梁;剪切;延性;有限元分析中图分类号:TU375;TU528文献标志码:A文章编号: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
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