钢纤维混凝土的增强机理及断裂韧性的研究

《钢纤维混凝土的增强机理及断裂韧性的研究》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、摘要近年柬，钢纤维温凝土啦发展髯蜷迅遂，已经得到广泛的废用，大量礤究表踺镪野维前掺入使混凝±的菲线性及蜂德后鞔纯特性樗鄹显薯改善，钢纤维混激土的断裂性能怒钢纤维懑凝±熬蓬要力攀性戆乏一，僵鬟翦星建薅锯终维瀑凝主凝襄黪蠖垫舔究还较步。本文引进索混凝±的双K断裂凇则，考麟钢纤维瀹凝土的软化特性，对铡纤维滁凝土骜溪潦橇鍪黎凝裂蘩髅戆落’冀方法逡嚣磋究。著禳援豢蘧凝±囊寮绎缭滢凝±褥差箨，辩相关参故进行修正，搬出了通合计算钢纤维混凝土断裂韧性的方法。逶建霹掺撩不嚣长度、不满蒋菝搴辫锈瓣绥嚣袋主瓣三赢弩薅粱试验，溅褥锈纤维箍凝±的P～矗战线，P--CMOD曲线，缝合试验

2、结果辩锶纤缎的增强规理进行分板，姆试俘分为纤维体积率小予临界纤维体积率(Pr《户。)和纤维体积率犬于临界纤维体积率≤辨>矿。》溪释{鬻溪。摸黎遮嚣静媾蠢鎏爨了诗葵镶野黎游凝±鬣嚣攀甏参数藜方法。趔熙零文试骏数据，计冀德裂器缎试{串救凝裂参数，怼各参数龄分辑袭鼹，爨本文撬蕊螅方法计算钢辩雅混溅±的断璐韧性是合理韵，键表明为了充分发挥纤维的增强作用，谯实际建爨中遥袋涎绎缝舔穰率∥，痤该蕊岛>妒黼。避过麓模型痰爨骜藤浮运骥礁了袭实际应用学将起裂蜘度j涩作势结掬物的控制指橼是有慰雉的e掇出了纾罐滑移徽韵概念，并拟裔出纤维滑移爨和纤维特征参数的关慕式；通过对PI盎垒癌缓

3、骛羧谴诧娥遵褥爨了键纾缭滠凝主浆佬燕线，虢攥豢镶驽滚灌凝±懿挺锌黢变软化规律。爨震，露黪臻蹇熬蠹骞逮器了惑瑟，莠嚣镳簿黎邈凝±辩鬻方委瀚醑究鬟漱了旯赢建议。美蕤谬：锈黪潍混凝土；霰K凝螽i准涮；裂缝墨张开位移；断裂过糕区；断裂韧度AB瓣RA￡专Rencently，steelfiberreinforcedconcrete(SFRC)hasbeenwidelyused，AlotofresearchhaveindicatedthatthesteelfibermixingintoconcretecanevideutIyimprovethenonlinearcharac

4、teristicandsofeningch锹,'acreristicafterpeakvalueofSFRC．Fracturecapabilib,ofSFRCis0124：ofimportantcapabili簪涟itsmechanicalcharacteristic，butthereareafewpeopleOnstudyingthefracturecharacteristicofSFRCinOUrCOuI{t姆．IntroduceddoubleuKfracturecriterionusedinconcreteandconsideredsofteningch

5、aracteristicofSFRC，this茹p口primarilyNudythestrengtheningmechanismand搬。methodofcalculatingthefracture￡拼培bnegofSFRC。BasedonthedifferencebetweenconcreteandSFRC，amendedtherelativepwa搬etefs，thepapertales静findtheproperwaytocalculatethefracturetoughhessofSFRC．Throughtheexperimentofathree-po

6、intbendingbeamwhichismixed{#静differenttenghandvokrmrateofsteelf；ber,itmeasarestheP—AcurveandP-CMODcurveofSFRC．Combinedwiththeresultofexperiment。the持8∞转thatsteel夔淞enha琏cedtheloughressisanab恻．鞋isfoundthat建嚣specimen￡曼程bedividedintotwocases：Pz《p煳andpf>P㈨-BasedonthetwoeasesttWOmethodstoc

7、alculatethedouble—KfracttrreparameterofSFRCaregiven，Then，usingthedataofexperiment,wecarlreceivedthefractureparameterofeveryspecimen．Throughanalyzingthefracturepa．-*'ameter,氇emethod08nbeprovedpropertocalculatethefracturetoughness·他eanalysisprovesthatthevelumratevaluemwhichischoseshou

8、ldmeetpS>pMinordert