钢管再生混凝土柱塑性铰长度试验研究_张向冈_陈宗平_薛建阳

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1、第45卷第20期建筑结构Vol．45No．202015年10月下BuildingStructureOct．2015*钢管再生混凝土柱塑性铰长度试验研究1，222张向冈，陈宗平，薛建阳(1河南理工大学土木工程学院，焦作454000;2广西大学土木建筑工程学院，南宁530004)［摘要］为研究钢管再生混凝土柱的塑性铰长度，以再生粗骨料取代率、长细比、轴压比和含钢率为变化参数，对10个圆钢管再生混凝土柱和6个方钢管再生混凝土柱试件进行拟静力试验。根据试件的破坏形态、滞回曲线，并基于等效塑性铰理论，提出压弯状态

2、下圆钢管再生混凝土柱和方钢管再生混凝土柱的等效塑性铰长度计算公式。研究结果表明:钢管再生混凝土柱破坏形态与普通钢管混凝土柱相似，钢管底部鼓曲破坏，底部的核心再生混凝土被压碎;钢管再生混凝土柱滞回曲线比较饱满，其形状从梭形发展到弓形，当再生粗骨料的取代率分别为0%，30%，70%，100%时，试件的滞回曲线受其影响不大;圆钢管再生混凝土柱等效塑性铰长度是其截面高度的0.45～0.95倍，方钢管再生混凝土柱等效塑性铰长度是其截面高度的0.65～0.75倍。［关键词］圆钢管再生混凝土柱;方钢管再生混凝土柱;拟

3、静力试验;等效塑性铰长度中图分类号:TU398文献标识码:A文章编号:1002-848X(2015)20-0052-05Teststudyonplastichingelengthofrecycledaggregateconcretefilledsteeltubecolumn1，222ZhangXianggang，ChenZongping，XueJianyang(1SchoolofCivilEngineering，HenanPolytechnicUniversity，Jiaozuo454000，China

4、;2CollegeofCivilEngineeringandArchitecture，GuangxiUniversity，Nanning530004，China)Abstract:Tostudyplastichingelengthofrecycledaggregateconcretefilledsteeltubecolumn，quasi-statictestswerecarriedoutonspecimensincludingtenrecycledaggregateconcretefilledcircu

5、larsteeltubecolumnsandsixrecycledaggregateconcretefilledsquaresteeltubecolumnswithdifferentreplacementratiosofrecycledcoarseaggregate，slendernessratios，axialcompressionratiosandsteelratios．Accordingtofailuremodeandthehystereticcurves，computationalformula

6、sofequivalentplastichingelengthwereproposedforrecycledaggregateconcretefilledcircularsteeltubecolumnsandrecycledaggregateconcretefilledsquaresteeltubecolumnsundercompressionandbendingbasedonthetheoryofequivalentplastichinge．Itisshownthatthefailuremodesof

7、specimensaresimilartoonesofcommonconcretefilledsteeltubecolumnswiththebuckledsteeltubeatthebottomandthecrushedcorerecycledaggregateconcreteatthebottom．Thehystereticcurvesareplumpandtheirshapeschangefromfusiformtoarch．Whenreplacementratioofrecycledcoarsea

8、ggregateisrespectively0%，30%，70%and100%，influenceonthehystereticcurvesislittle．Equivalentplastichingelengthsofcircularspecimensareas0.45～0.95timeshighascrosssectionheights，whileonesofsquarespecimensareas0.65～0.75timeshigha