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1、學(xué)兔兔www.xuetutu.com第18卷第4期建筑材料學(xué)報(bào)Vo1.18,NO.42O15年8月JOURNALOFBUIIDINGMATERIALSAug.,2015文章編號(hào):1O07—9629(2O15)O4—0647-06火災(zāi)(高溫)后破碎卵石混凝土三軸受力性能研究蘇益聲一,孟二從,陳宗平,曾文祥(1.廣西大學(xué)土木建筑工程學(xué)院,廣西南寧530004;2.廣西大學(xué)廣西防災(zāi)減災(zāi)與工程安全重點(diǎn)實(shí)驗(yàn)室,廣西南寧530004)摘要:為研究火災(zāi)(高溫)后破碎卵石混凝土的三軸受力性能,以溫度及側(cè)向圍壓為參數(shù),完成了3O個(gè)~1oo×200mm的圓柱體試件在經(jīng)歷不同高溫后的常規(guī)三軸加載試驗(yàn).結(jié)果表明:火
2、災(zāi)(高溫)后破碎卵石混凝土試件在單向應(yīng)力下的應(yīng)力一應(yīng)變曲線有明顯的峰值點(diǎn),隨著溫度的增加,峰值點(diǎn)逐漸向右下角移動(dòng);在三向應(yīng)力下試件的破壞形態(tài)分為斜面剪切破壞與層狀劈裂破壞;隨著圍壓的不斷增加,試件的應(yīng)力一應(yīng)變曲線逐漸平緩,峰值點(diǎn)也越來越不明顯,溫度的影響逐漸減小,其彈性模量、峰值應(yīng)力、峰值應(yīng)變均顯著增加;隨著溫度的上升,試件的峰值應(yīng)力與彈性模量整體呈下降趨勢;基于試驗(yàn)數(shù)據(jù)建立了相關(guān)計(jì)算公式及火災(zāi)(高溫)后破碎卵石混凝土在三軸應(yīng)力下的應(yīng)力一應(yīng)變本構(gòu)方程,可為相關(guān)研究提供參考.關(guān)鍵詞:破碎卵石混凝土;受力性能;試驗(yàn)研究;火災(zāi)(高溫);三軸受力中圖分類號(hào):TU528.01文獻(xiàn)標(biāo)志碼:Adoi:10
3、.3969/j.issn.1007—9629.2015.04.019TriaxialMechanicalPerformanceofBrokenPebbleConcreteafterFire(HighTemperature)SUYisheng,』ENGErcong,CHENZongping,ZENGWenxiang(1.SchoolofCivilandArchitecturalEngineering,GuangxiUniversity,Nanning530004,China;2.KeyLaboratoryofDisasterPreventionandStructuralSafetyofGuan
4、gxi,GuangxiUniversity,Nanning530004,China)Abstract:Toinvestigatethetriaxialstressofbrokenpebbleconcreteafterfire(hightemperature),30100×200mmcylinderspecimenswithtemperatureandlateralconfiningpressureasparametersunderconven—tiona1triaxialloadingtestweremeasured.Theresultsshowthatafterfire(hightempe
5、rature),whenunderuniaxialstress,thestress—straincurvehasanobviouspeak.Withtheincreaseoftemperature,thepeakpointdeclinesandmovestotheright;whenundertriaxialstress,thefailurepatternofbrokenpebblecon—cretecanbedividedintocantshearfailureandlayeredsplittingfailure.Withincreaseoflateralconfiningpressure
6、,thestress—straincurvebecomessmoothandplumpandthepeakpointbecomesmoreandmoreunobvious,andtheelasticmodulus,peakstressandpeakstrainofspecimensaresignificantlyincreasing.Withtheincreaseoftemperature,thepeakstressandelasticmoduluspresentadownwardtrend.Basedonexperimentaldata,therelationalcalculationfo
7、rmulaandstress—strainconstitutiverelationformulaaregiv—an,theresultscanprovidereferenceforrelatedwork.Keywords:brokenpebbleconcrete;mechanicalperformance;experimentalstudy;fire(hightemperature);trjaxia】stre