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时间:2019-05-13
《箍筋约束L形截面柱轴压性能分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第42卷第9期天津大学学报Vol.42No.92009年9月JournalofTianjinUniversitySep.2009▋箍筋约束L形截面柱轴压性能分析1,21,3王铁成,王晓伟(1.天津大学建筑工程学院,天津300072;2.天津市土木工程结构及新材料重点试验室,天津300072;3.河北工业大学土木工程学院,天津300401)摘要:为了研究箍筋约束混凝土L形截面柱的轴心受压性能,进行了7根箍筋约束混凝土柱的轴心受压试验,并采用有限元软件分析了箍筋对L形截面柱的核心混凝土的约束作用,建立了箍筋横向约束应力计算模型.在此基础上通过试验回归分析了箍筋约束混凝土的抗压强
2、度、峰值应变与配箍特征值、箍筋有效约束系数的关系表达式,并建立了箍筋约束混凝土L形截面短柱的轴心受压承载力计算公式.结果表明约束混凝土的抗压强度及其峰值应变与配箍特征值和箍筋有效系数的乘积呈非线性关系.与试验结果比较,轴心受压承载力计算公式偏于安全,可用于箍筋约束混凝土L形截面短柱的轴心受压承载力的分析.关键词:L形截面;约束混凝土;轴心受压;配箍特征;约束系数中图分类号:TU375.3文献标志码:A文章编号: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随着钢筋混凝土异形柱结构体系的推广和应用,混凝土处于三向受压应力状态,提高
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