带约束拉杆异形截面钢管内核心混凝土等效单轴本构关系

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1、文章编号:1000-6869(2011)12-0186-09带约束拉杆异形截面钢管内核心混凝土等效单轴本构关系蔡健1，左志亮2，谢小东2，陈映瑞2，陈庆军2(1．华南理工大学亚热带建筑国家重点实验室，广东广州510641;2．华南理工大学土木工程系，广东广州510641)摘要:在钢板中部位置设置具有约束钢板外凸变形作用的水平拉杆，是改善异形截面钢管混凝土柱力学性能的有效方法。在已有文献对带约束拉杆方形、矩形、L形、T形、十形截面钢管混凝土短柱轴压试验研究成果的基础上，通过合理假定，将L形、T形和十形钢管混凝土截面分别划分成一个无拉杆的方形和若干个有拉杆的矩形

2、钢管混凝土区域，借鉴约束混凝土本构模型，分别建立力学表达格式统一的带约束拉杆方形和矩形截面、以及带约束拉杆L形、T形、十形截面各区域的钢管内核心混凝土等效单轴本构关系。采用所建立的本构关系对相关试验的试件进行了荷载-应变全过程分析，计算曲线和试验曲线吻合良好。关键词:异形钢管混凝土短柱;约束拉杆;核心混凝土;等效单轴本构关系中图分类号:TU398.2TU528.59文献标志码:AEquivalentuniaxialconstitutiverelationshipforcoreconcreteofspecially-shapedsteeltubularcolu

3、mnwithbindingbarsCAIJian1，ZUOZhiliang2，XIEXiaodong2，CHENYingrui2，CHENQingjun2(1．StateKeyLaboratoryofSubtropicalBuildingScience，SouthChinaUniversityofTechnology，Guangzhou510641，China;2．CivilEngineeringDepartment，SouthChinaUniversityofTechnology，Guangzhou510641，China)Abstract:Themech

4、anicalbehaviorofspecially-shapedconcrete-filledsteeltubular(CFT)columnscanbeeffectivelyimprovedbysettingbindingbarsinthemiddlepositionsofthesteelplates，sincetheout-of-planedeformationofsteelplatesisconstrainedbythebindingbars．Basedontheexperimentalresultsaboutthesquare，rectangular，

5、L-shaped，T-shapedandcross-shapedCFTstubcolumnswithbindingbarssubjectedtoaxialloadandreasonableassumptions，theL-shaped，T-shapedandcross-shapedsectioncanbedividedintoasquareandseveralrectangularregions，respectively，wheretherectangularregionshavebindingbarswhilethesquareregiondoesnot．

6、TheconstitutiverelationshipoftheconfinedconcreteisreferredasthedevelopmentoftheequivalentuniaxialconstitutiverelationshipforthecoreconcreteofthesquareandrectangularCFTstubcolumnswithbindingbarsandthedividedregionsoftheL-shaped，T-shapedandcross-shapedCFTstubcolumnswithbindingbars．Th

7、eproposedequivalentuniaxialconstitutiverelationshipisbasedonclearmechanicalconceptandhasuniformexpressingformats．Theresultsoftheloadversusstraincurvescalculatedbytheproposedconstitutiverelationshipareingoodagreementwiththeexperimentalones．Keywords:specially-shapedCFTstubcolumn;bind

8、ingbar;coreconcrete;equiva