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1、第45卷第22期建筑結(jié)構(gòu)Vol.45No.222015年11月下BuildingStructureNov.2015*實(shí)腹式型鋼混凝土十字形柱抗震性能研究1,2223李凱文,王玉玲,萬(wàn)鑫,張波(1無(wú)錫環(huán)境科學(xué)與工程研究中心,無(wú)錫214153;2無(wú)錫城市職業(yè)技術(shù)學(xué)院,無(wú)錫214153;3同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所,上海200092)[摘要]對(duì)4個(gè)不同軸壓比、配鋼率、加載方向的實(shí)腹式型鋼混凝土十字形柱進(jìn)行了低周反復(fù)加載試驗(yàn),通過(guò)觀測(cè)試件各階段的開(kāi)裂變形及破壞形態(tài),并分析其破壞機(jī)理,得到其荷載-位移滯回曲線、骨架曲線、剛度退化、強(qiáng)度衰減、耗能能力及位移延
2、性系數(shù)。通過(guò)分析試件的位移延性系數(shù),得到影響實(shí)腹式型鋼混凝土十字形柱延性的主要因素。結(jié)果表明,實(shí)腹式型鋼混凝土十字形柱試件在其剪跨比為3.25時(shí)發(fā)生彎曲破壞形態(tài);軸壓比較高時(shí),試件強(qiáng)度衰減幅值較小,試件達(dá)到極限承載力后剛度退化較快,延性降低;配鋼率加大,試件極限承載力有較大提高,強(qiáng)度衰減和剛度退化相對(duì)平穩(wěn);相同條件下,沿45°方向加載的試件極限承載力比沿工程軸加載的試件極限承載力高,且達(dá)到極限承載力后剛度退化較快。[關(guān)鍵詞]十字形柱;實(shí)腹式型鋼;軸壓比;配鋼率;抗震性能+中圖分類(lèi)號(hào):TU398.7文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002-848X(2015
3、)22-0080-05Researchonseismicbehaviorofsolid-websteelreinforcedhigh-performanceconcretecross-shapedcolumn1,2223LiKaiwen,WangYuling,WanXin,ZhangBo(1CenterofEnvironmentCivilEngineering,Wuxi214153,China;2WuxiCityCollegeofVocationalTechnology,Wuxi214153,China;3ResearchInstituteofSt
4、ructuralEngineering&DisasterReduction,TongjiUniversity,Shanghai200092,China)Abstract:Aseriesoflowcyclicloadingtestswerecarriedouton4solid-websteelreinforcedconcretecross-shapedcolumnswithdifferentaxialcompressionratios,steelratiosandloadingdirections.Throughtheobservationofcra
5、ckingandfailuremodesineachprocessandanalysisoffailuremechanism,theload-displacementhysteresiscurveswereobtainedaswellasskeletoncurves,stiffnessdegradation,strengthdegradation,energydissipationcapacityanddisplacementductilitycoefficients.Themainfactorswhichinfluencetheductility
6、ofthecolumnwerestudiedbyanalyzingdisplacementductilitycoefficients.Thetestresultsindicatethatthecolumnwillbendfailurewiththeshearspanratioof3.25.Whentheaxialpressureisrelativelyhigh,theattenuationamplitudeofthespecimenstrengthissmaller,andthestiffnessdegradationisfasterwhileth
7、eductilitydecreases.Whenthesteelratioincreases,theultimatebearingcapacityofthespecimenisimproved,andthestrengthattenuationisrelativelysmoothaswellasstiffnessdegradation.Underthesameconditions,theultimatebearingcapacityofthespecimenalongtheloadingdirectionof45°ishigherthanthato
8、fthespecimenalongtheloadingdirectionofengineeringaxis,andthes