多室式钢管混凝土T形构件纯弯力学性能研究
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摘要
进行了4个多室式钢管混凝土T形试件和2个多室式空钢管T形对比试件的纯弯试验,着重研究前者在纯弯状态下的变形过程及破坏形态,同时考察了截面尺寸、加载位置等参数对其纯弯力学性能的影响。试验结果表明:增大截面腹板高度能显著提高多室式钢管混凝土T形试件的抗弯承载力;力分别作用在翼缘或腹板时其承载能力有一定的差异;试件的破坏形态以整体弯曲为主。采用有限元方法对多室式钢管混凝土T形试件的弯矩-挠度曲线进行了全过程分析,与试验结果吻合较好。最后在参数分析的基础上提出了多室式钢管混凝土T形构件抗弯承载力的实用计算方法。
4 multi-cell T-shaped concrete-filled steel tubes(MT-CFST) and 2 multi-cell T-shaped steel tubes(MT-ST) subjected to pure bending were tested.The failure modes and the effects of cross-section dimensions and loading position on pure bending behaviors of MT-CFST specimens were examined as well.It was found in the experiment that the flexural capacities of MT-CFST specimens can be significantly enhanced by increasing the web height.The loading capacity was different when the force acted on the flange or the Web.Failure modes were mainly overall bending.Subsequently the finite element method is used to calculate the moment-deflection relationships of the MT-CFST specimens.The calculated curves show good agreement with the presented test results.Based on the parametric analysis,a simplified formula for calculating the ultimate strength of the new type of composite members under pure bending is recommended in the end.
4 multi-cell T-shaped concrete-filled steel tubes(MT-CFST) and 2 multi-cell T-shaped steel tubes(MT-ST) subjected to pure bending were tested.The failure modes and the effects of cross-section dimensions and loading position on pure bending behaviors of MT-CFST specimens were examined as well.It was found in the experiment that the flexural capacities of MT-CFST specimens can be significantly enhanced by increasing the web height.The loading capacity was different when the force acted on the flange or the Web.Failure modes were mainly overall bending.Subsequently the finite element method is used to calculate the moment-deflection relationships of the MT-CFST specimens.The calculated curves show good agreement with the presented test results.Based on the parametric analysis,a simplified formula for calculating the ultimate strength of the new type of composite members under pure bending is recommended in the end.
引文
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[2]杨有福,韩林海.矩形钢管混凝土构件抗弯力学性能的试验研究[J].地震工程与工程振动,2001,21(3):41―48.Yang Youfu,Han Linhai.Experimental studies onbehavior of concrete-filled RHS members subjected topure bending[J].Earthquake Engineering andEngineering Vibration,2001,21(3):41―48.(in Chinese)
[3]Chitawadagi M V,Narasimhan M C.Strengthdeformation behavior of circular concrete filled steeltubes subjected to pure bending[J].Journal ofConstructional Steel Research,2009,65(8):1836―1845.
[4]Uy B.Strength of concrete filled steel box columnsincorporating local bucking[J].Journal of StructuralEngineering-ASCE,2000,126(3):341―352.
[5]Han Linhai.Flexural behavior of concrete-filled steeltubes[J].Journal of Constructional Steel Research,2004,60(2):313―337.
[6]Lu Hui,Han Linhai,Zhao Xiaoling.Analytical behaviorof circular concrete-filled thin-walled steel tubessubjected to bending[J].Thin-walled Structures,2009,47(3):346―358.
[7]于清,陶忠,陈志波,吴颖星.钢管约束混凝土纯弯构件抗弯力学性能研究[J].工程力学,2008,25(3):187―193.Yu Qing,Tao Zhong,Chen Zhibo,Wu Yingxing.Flexural behavior of steel tube confined concretemembers under pure bending[J].Engineering Mechanics,2008,25(3):187―193.(in Chinese)
[8]徐礼华,刘胜兵,温芳,等.T形钢管混凝土组合构件抗弯性能[J].华中科技大学学报(自然科学版),2009,37(2):117―120.Xu Lihua,Liu Shengbing,Wen Fang,et al.Flexuralbehavior of composite members of T-section concretefilled steel tubes[J].Journal of Huazhong University ofScience and Technology(Natural Science Edition),2009,37(2):117―120.(in Chinese)
[9]GB/T228-2002,金属材料室温拉伸试验方法[S].北京:中国标准出版社,2002.GB/T 228-2002,Metallic materials tensile testing atambient temperature[S].Beijing:Standard Press ofChina,2002.(in Chinese)
[10]GB/T50081-2002,普通混凝土力学性能试验标准[S].北京:中国建筑工业出版社,2003.GB/T 50081-2002,Standard for test method of mechani-cal properties on ordinary concrete[S].Beijing:ChinaArchitecture and Building Press,2003.(in Chinese)
[11]韩林海.钢管混凝土结构—理论与实践[M].第2版.北京:科学出版社,2007:66―75.Han Linhai.Concrete-filled steel tubular structures-theory and practice[M].2nd ed.Beijing:Science Press,2007:66―75.(in Chinese)
[12]屠永清,刘林林,叶英华.多室式钢管混凝土T形短柱的非线性分析[J].工程力学,2012,29(1):134―140.Tu Yongqing,Liu Linlin,Ye Yinghua.Nonlinearanalysis of multi-cell T-shaped concrete filled steeltubular stub columns[J].Engineering Mechanics,2012,29(1):134―140.(in Chinese)
[13]Eurocode 4,Design of composite steel and concretestructures,Part1-1:General rules and rules for buildings[S].Brussels:European Committee for Standardization(CEN),1994.
[14]GJB4142-2000,战时军港抢修早强型组合结构技术规程[S].北京:解放军总后勤部,2001.GJB 4142-2000,Technical specifications for earlystrength model composite structure used for navy portemergency repair in wartime[S].Beijing:GeneralLogistics Department of the CPLA,2001.(in Chinese)
[15]AIJ,Recommendation for design and construction ofconcrete filled steel tubular structures[S].Tokyo:Architectural Institute of Japan,1997.
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