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1、第42卷第9期天津大學(xué)學(xué)報Vol.42No.92009年9月JournalofTianjinUniversitySep.2009▋箍筋約束L形截面柱軸壓性能分析1,21,3王鐵成,王曉偉(1.天津大學(xué)建筑工程學(xué)院,天津300072;2.天津市土木工程結(jié)構(gòu)及新材料重點試驗室,天津300072;3.河北工業(yè)大學(xué)土木工程學(xué)院,天津300401)摘要:為了研究箍筋約束混凝土L形截面柱的軸心受壓性能,進行了7根箍筋約束混凝土柱的軸心受壓試驗,并采用有限元軟件分析了箍筋對L形截面柱的核心混凝土的約束作用,建立了箍筋橫向約束應(yīng)力計算模型.在此基礎(chǔ)上通過試驗回歸分析了箍筋約束混凝土的抗壓強
2、度、峰值應(yīng)變與配箍特征值、箍筋有效約束系數(shù)的關(guān)系表達式,并建立了箍筋約束混凝土L形截面短柱的軸心受壓承載力計算公式.結(jié)果表明約束混凝土的抗壓強度及其峰值應(yīng)變與配箍特征值和箍筋有效系數(shù)的乘積呈非線性關(guān)系.與試驗結(jié)果比較,軸心受壓承載力計算公式偏于安全,可用于箍筋約束混凝土L形截面短柱的軸心受壓承載力的分析.關(guān)鍵詞:L形截面;約束混凝土;軸心受壓;配箍特征;約束系數(shù)中圖分類號:TU375.3文獻標(biāo)志碼:A文章編號:0493-2137(2009)09-0770-07PerformanceAnalysisofAxiallyLoadedL-ShapedColumnsConfinedw
3、ithStirrups1,21,3WANGTie-cheng,WANGXiao-wei(1.SchoolofCivilEngineering,TianjinUniversity,Tianjin300072,China;2.TianjinKeyLaboratoryofCivilEngineeringStructuresandNewMaterials,Tianjin300072,China;3.SchoolofCivilEngineering,HebeiUniversityofTechnology,Tianjin300401,China)Abstract:Tostudythep
4、erformanceofaxiallyloadedL-shapedcolumnsconfinedwithstirrups,7L-shapedcolumnsconfinedwithstirrupsweretestedforaxialcompressionloading.ThestirrupeffectiverestraintoncoreconcreteofL-shapedcolumnswasstudiedwithfiniteelementsoftwareandthecalculationmodelofstirruptransversalrestraintstresswases
5、tablished.Accordingtothetests,therelationalexpressionsofcompressivestrength,peakstrainofconfinedconcreteandstirrupcharacteristicvalues,stirrupeffectiverestraintcoefficientwereregressivelyanalyzed,andthecalculationformulaofultimatebearingcapacitywaspresentedforaxiallyloadedshortL-shapedcolu
6、mnsconfinedwithstirrups.Experimentalresultsshowthatcompressivestrengthandpeakstrainofconfinedconcretehaveanonlinearrelationshipwiththeproductofstirrupcharacteristicvaluesandstirrupeffectiverestraintcoefficient.Thecalculationformulaofultimatebearingcapacityissafewhencomparedwithexperimental
7、results,anditisapplicabletotheanalysisoftheultimatebearingcapacityofaxiallyloadedshortL-shapedcolumnsconfinedwithstirrups.Keywords:L-shapedsection;confinedconcrete;axialcompression;stirrupcharacteristic;restraintcoefficient隨著鋼筋混凝土異形柱結(jié)構(gòu)體系的推廣和應(yīng)用,混凝土處于三向受壓應(yīng)力狀態(tài),提高