資源描述:
《外包槽鋼-混凝土組合梁受力性能研究-論文.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第43卷第6期建筑結(jié)構(gòu)Vo1.43No.62013年3月下BuildingStructureMar.2013外包槽鋼一混凝土組合梁受力性能研究陳宗平,張向?qū)?,范杰,薛建?yáng)(1廣西大學(xué)土木建筑工程學(xué)院,南寧530004;2西安建筑科技大學(xué)土木工程學(xué)院,西安710055)[摘要]設(shè)計(jì)了6根外包槽鋼一混凝土組合梁試件,進(jìn)行靜力單調(diào)抗彎加載試驗(yàn)。通過(guò)實(shí)測(cè)跨中撓度、混凝土應(yīng)變、槽鋼應(yīng)變、綴件應(yīng)變等重要數(shù)據(jù),繪制構(gòu)件荷載.位移、荷載一應(yīng)變等重要關(guān)系曲線,分析應(yīng)變沿截面高度的分布情況,采用能量等值法計(jì)算試件的彎曲延性系數(shù),提出抗彎承載力計(jì)算公式。試驗(yàn)研究和理論分析結(jié)果表明:剪跨比為3.0的
2、組合梁試件均發(fā)生了彎曲一粘結(jié)滑移失效破壞;粘結(jié)滑移現(xiàn)象發(fā)生之后,純彎段截面應(yīng)變沿高度分布不再符合平截面假定,試件破壞時(shí),上部受壓槽鋼、下部受拉槽鋼屈服,剪彎段綴件沒(méi)有屈服;單調(diào)靜力加載條件下,試件的彎曲延性性能較好,變形性能良好;運(yùn)用文中提出的計(jì)算公式設(shè)計(jì)外包槽鋼混凝土組合梁的抗彎承載力時(shí),需乘以0.8的折減系數(shù)。[關(guān)鍵詞】外包槽鋼;組合梁;抗彎性能;受彎承載力計(jì)算中圖分類號(hào):TU398.7文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—848X(2013)06-0068-04Researchonmechanicalperformanceofchannelsteelencasedconcr
3、etecompositebeamsChenZongping,ZhangXianggang,F(xiàn)anJie,XueJianyang(1CollegeofCivilEngineeringandArchitecture,GuangxiUniversity,Nanning530004,China;2SchoolofCivilEngineering,XianUniversityofArchitectureandTechnology,Xian710055,China)Abstract:Inordertostudymechanicalbehaviorofchannelsteelencased
4、concretecompositebeams,6specimensweredesignedformonotonicstaticforcebendingloadingtest.Basedonthedataofmid-spandeflection,concretestrain,channelsteelstrainandlacebarstrain,thecurvesofload—deflectionandload—strainweredrawn.Straindistributionalongthebeamheightwasmade,bendingductilitycoefficie
5、ntwascalculatedwiththemethodofequivalentenergy,andthecalculatingformulaforbendingbearingcapacitywasproposed.Bytheexpetimentalstudyandtheoreticalanalysis,itisshownthatbending—bondfailuremodeoccursonspecimensofwhichshearspanratiois3.0.Afterbond—slip,thestraindistributionofpurebendingsectional
6、ongthebeamheightnolongermeetstheplanesectionassumption.Whenspecimensbreak,theuppercompressionchannelsteelandthelowertensionchannelsteelyield,whilelacebarsinthebendingshearsectionsdonotyield.Undermonotonicstaticforceloadingconditions,thebendingductilityishighandthedeformationperformanceiswel
7、1.Bendingbeatingcapacityofchannelsteelencasedconcretecompositebeamscanbedesignedwiththecalculationformular,butareductionfactorof0.8isrequired.Keywords:encasedchannelsteel;compositebeam;bendingbearingperformance;bendingbeatingcapacitycalculation0引言SteelEn