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1、2016年第10期(總第324期)Number10in2016(TotalNo-324)混凝土Concrete理論研究THEORETICALRESEARCHdoi:lO.3969a.issn.1002—3550.2016.10.012高溫作用下再生異形鋼管混凝土短柱軸的壓力學性能研究唐峻峰(南充職業(yè)技術學院,四川南充637131)摘要:以高溫加熱溫度、鋼材保護層厚度、恒溫時間為變量,為研究高溫作用下再生異形鋼管混凝土短柱軸的壓力學性能,對lo個不同試件進行高溫加熱后的抗壓試驗,觀察不同溫度后試件的受力破壞過程,獲取荷載一位移全
2、過程曲線和剩余承載力等數(shù)據(jù),并對各參數(shù)對其力學性能的影響予以分析。結果表明,高溫作用下再生異形鋼管混凝土短柱軸的受壓破壞過程及形態(tài)與常溫下基本相同。高溫再生異形鋼混凝土柱的軸壓剛度和剩余承載力退化明顯,且溫度越高,退化程度越大。當400℃以下時,再生異形鋼管混凝土短柱軸剩余承載力衰減不明顯,在溫度從200℃升高到400℃時,Pu(71)俄值從23.O減小到17.0;在400~700℃,隨著溫度的提高,剩余承載力持續(xù)降低,700℃時,Pu(r),Pu值減小約45.O。關鍵詞:高溫;再生異形鋼管混凝土;短柱軸;壓力學中圖分類號:T
3、U528.0l文獻標志碼:A文章編號:1002—3550(2016)10一0046一04studyonthep怕鷂urepe—brmanceofr∞ycIedagg怕g砒econcr吼e硎edsteeItubuIarshortcolumnsunderhightemperatureMNGJ咖岔玎g(NaJlchongVocational觚dTechicalCollege,Nanchong63713l,China)Abstract:Studyonthea)(ialcompressionperf0咖蛐ceofrecycledaggr
4、el,ateconcrete徹edsteeltubularshoncol啪ns岫derhiglltemperatLIre,lOspecimensweredesignedforcompressiontestaRerhightemperature,andthfeeva叫ngparalTleterswereconsidered,whichwerethehightemperature,theconstanttemperatIlretime,thecoVermickness.Thefailureprocessesofspecimens砒
5、di何’erenttemperatureswereobserved,tlleload-displacementcurves,residualbearingcapacity,aIldomerimponantdatawereobtained.Andthee仃ectinglawofeachchan百ngparameterSonⅡIerecycledaggregateconcrete舢edsteelnlbularshoncol啪nsmech鋤icalbehaViora舵rhightemperamrewasanalyzed.Result
6、sshowthatthefailuremodeofrecycledaggregateconcretcfilledsteeltIlbularshoncolumnsaRerhightemperamrewassimilartothatatnonTlaltemperature.Therecycledaggregateconcretefilledsteeltubularshoncolu枷safterhightemperaturehadcertaindefonnationperl’0manceafterultim砒eload,butmea
7、xialri百di夠andresidmlbe捌ngc印aci夠ofspecimenswerereducedcomparedwiththatatnormaltemperature.When也e400℃aIldregenerationofspecial-shapedconcrete—filledsteelnJbularshoncolu砌axialresidualbearingcapacityattenuationwaSnotobvious,atatemperatureof200℃fbmincreasedto400℃,Pu(r),P
8、udecrcases廳om23.Oto17.O;at400afld700℃,withtheincreaSeoftempemttlre,tlleremainingc印aci哆continuedtodecre船e,at700℃.Pu(r)/Rdecreasesabout45.O.