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1、2015年第4期(總第306期)混凝土理論研究Number4in2015(TotalNo.306)THE0RETICALRESEARCHConcretedoi:10.3969/j.issn.1002—3550.2015.04.015圓鋼管再生混凝土中長(zhǎng)柱軸壓性能退化研究李軍濤,徐金俊,陳宗平,經(jīng)承貴(1.廣西交通職業(yè)技術(shù)學(xué)院,廣西南寧530023;2.廣西大學(xué)土木建筑工程學(xué)院,廣西南寧530004;3.廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室,廣西南寧530004)摘要:為了揭示圓鋼管再生混凝土中長(zhǎng)柱在軸心荷載作用下的性能退化規(guī)律,以再生粗骨料取代率和長(zhǎng)細(xì)比為變化參數(shù),完成了5個(gè)試件的軸心
2、受壓試驗(yàn)。在此基礎(chǔ)上,分析了其延性指標(biāo)、能量耗散、剛度退化的演化過(guò)程。研究結(jié)果表明:再生粗骨料取代率的增加,試件的耗能能力隨之提高,彈性軸壓剛度也變大,且圓鋼管再生混凝土試件的延性系數(shù)均比圓鋼管混凝土試件的大,承載能力也在取代率為50%時(shí)達(dá)最大;當(dāng)試件的長(zhǎng)細(xì)比增大后,耗能能力和彈性軸壓剛度均表現(xiàn)為先增后減的趨勢(shì),延性系數(shù)則保持增長(zhǎng)的態(tài)勢(shì),而承載能力有所降低;所得剛度退化的簡(jiǎn)化計(jì)算模型可為工程設(shè)計(jì)提供參考。關(guān)鍵詞:圓鋼管再生混凝土;中長(zhǎng)柱;取代率;耗能;延性;剛度中圖分類(lèi)號(hào):TU528.01文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002—3550(2015)04—0057—03Performancedegr
3、adationofmediumlongofcircularsteeltuberecycledaggregateconcreteunderaxialcompressionLIJunmo,XU]injun,CI-IENZongping,JINGChenggui(1.GuangxiTrafficVocationalandTechnicalCollege,Nanning530023,China;2.CollegeofCivilEngineeringandArchitecture,GuangxiUniversity,Nanning530004,China;3.KeyLaboratoryofDisast
4、erPreventionandStructuralSafetyofMinistryofEducation,GuangxiUniversity,Nanning530004,China)Abstract:Inordertorevealperformancedegradationrulesofmediumlongofcircularsteeltuberecycledaggregateconcreteunderaxi—alcompression,fivespecimensweretestedwiththechangingparametersofrecycledcoarseaggregaterepla
5、cementratioandslendernessratio.Basedonabove,theductilityindex,energydissipationandstiffnessdegradationwereanalyzed.Theresultsshowthatwiththerecy—cledcoarseaggregatereplacementratioincreasing,theenergy—dissipatingcapacityandelasticcompressionstiffnessofspecimenstendtoenlarge.Theductilityfactorofcirc
6、ularsteeltuberecycledaggregateconcreteislargerthanthatofcircularsteeltubecorcrete,andthebearingcapacityofspecimenunderthereplacementratio50%isthebiggest.Withtheslendernessratioincreasing,theenergy—dissipa—tingcapacityandelasticcompressionstiffnessofspecimenstendtoenlargeandthendegenerate,andtheduct
7、ilityfactorkeepsincreas—ing,however,thebearingcapacityisreduced.Thestiffnessdegradationofsimplifiedcalculationmodelcanprovideareferenceforengi—neeringdesign.Keywords:circularsteeltuberecycledaggregateconcre