圆端形椭圆钢管约束混凝土本构关系等效方法和轴压性能研究
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摘要
目前国内外对圆端形椭圆钢管混凝土柱的受力性能研究尚不系统,缺乏合理的圆端形椭圆钢管约束核心混凝土本构关系模型。为了解决核心混凝土本构关系问题,文章提出一种计算圆端形椭圆钢管约束核心混凝土本构关系的简化等效方法,用试验结果验证了该方法的可行性和准确性。采用ABAQUS有限元程序建立了圆端形椭圆钢管混凝土轴压短柱的数值分析模型,研究了诸多参数对圆端形椭圆钢管混凝土轴压承载力的影响,揭示了圆端形椭圆钢管混凝土短柱的破坏模式和受力机理。研究结果表明:圆端形椭圆钢管混凝土短柱在轴压作用下的破坏模式主要包括中部鼓曲破坏、端部鼓曲破坏和多带鼓曲破坏;其轴压受力特征均与约束效应系数有关;圆端形椭圆钢管混凝土短柱的轴压极限承载力随混凝土强度、钢材强度及截面尺寸的增大而增大。研究结果可为圆端形椭圆钢管混凝土柱理论研究和工程应用提供参考。
At present,the research on the mechanical behavior of round-ended elliptical concrete-filled steel tube(RECFST)columns is not systematic,and the reasonable constitutive relation model of confined core concrete is still lacking.To solve the problem of constitutive relation of confined core concrete,a simplified equivalent method for calculating constitutive relation of confined core concrete was proposed.The feasibility and accuracy of the equivalent method were verified by test results.In addition,the numerical analysis model of RECFST columns under axial compressive loading was established by ABAQUS software.The effect of various parameters on the axial compressive capacity of RECFST was analyzed.Failure modes and mechanical mechanism were also investigated.The results showed that the failure modes of RECFST columns included middle-height buckling,end local buckling and multi-ribbon buckling.The ultimate axial compressive capacity of RECFST columns increased with the increase of concrete strength,steel strength and sectional area.The results of the study will provide reference for the theoretical study and engineering application of RECFST columns.
At present,the research on the mechanical behavior of round-ended elliptical concrete-filled steel tube(RECFST)columns is not systematic,and the reasonable constitutive relation model of confined core concrete is still lacking.To solve the problem of constitutive relation of confined core concrete,a simplified equivalent method for calculating constitutive relation of confined core concrete was proposed.The feasibility and accuracy of the equivalent method were verified by test results.In addition,the numerical analysis model of RECFST columns under axial compressive loading was established by ABAQUS software.The effect of various parameters on the axial compressive capacity of RECFST was analyzed.Failure modes and mechanical mechanism were also investigated.The results showed that the failure modes of RECFST columns included middle-height buckling,end local buckling and multi-ribbon buckling.The ultimate axial compressive capacity of RECFST columns increased with the increase of concrete strength,steel strength and sectional area.The results of the study will provide reference for the theoretical study and engineering application of RECFST columns.
引文
[1]孙波,童乐为.椭圆钢管柱受压性能研究进展[J].建筑科学与工程学报,2013,30(2):76-81.
[2]令剑.钢管混凝土拱桥施工技术在渭河大桥中的应用[D].西安:西安建筑科技大学,2012.
[3]卢哲安.后湖斜拉桥钢管混凝土塔柱受力性能分析[D].武汉:武汉理工大学,2008.
[4]李刚.新型钢-混凝土组合结构力学性能研究[D].长沙:中南大学,2012.
[5]王志滨,陈靖,谢恩普,等.圆端形钢管混凝土柱轴压性能研究[J].建筑结构学报,2014,35(7):123-130.
[6]谢恩普,王志滨,林盛,等.圆端形钢管混凝土轴压短柱机理分析[J].福州大学学报(自然科学版),2013,43(4):517-522.
[7]付磊,丁发兴,谷利雄,等.圆端形钢管内约束混凝土轴压短柱的力学性能[J].华南理工大学学报(自然科学版),2014,42(11):113-120.
[8] DING F X,FU L,YU Z W,et al.Mechanical performances of concrete-filled steel tubular stub columns with round ends under axial loading[J].Thin-Walled Structures,2015,97:22-34.
[9]李锦华,王二磊.圆端形钢管混凝土偏压构件受力性能研究[J].武汉理工大学学报,2016,38(4):50-53.
[10]沈奇罕.椭圆钢管混凝土轴压、偏压和抗弯性能与破坏机理研究[D].合肥:合肥工业大学,2016.
[11]宋顺龙,王静峰,江汉,等.椭圆钢管混凝土受扭性能及抗扭承载力计算[J].合肥工业大学学报(自然科学版),2017,40(7):952-959.
[12]沈奇罕,王静峰,王伟.基于数值分析的椭圆钢管混凝土柱轴压性能及承载力计算[J].建筑钢结构进展,2015,17(6):68-78.
[13] ZHAO X L,PACKER J A.Tests and design of concretefilled elliptical hollow section stub columns[J].ThinWalled Structures,2009,47:617-628.
[14]韩林海.钢管混凝土结构理论与实践[M].2版.北京:科学出版社,2007:67-76.
[2]令剑.钢管混凝土拱桥施工技术在渭河大桥中的应用[D].西安:西安建筑科技大学,2012.
[3]卢哲安.后湖斜拉桥钢管混凝土塔柱受力性能分析[D].武汉:武汉理工大学,2008.
[4]李刚.新型钢-混凝土组合结构力学性能研究[D].长沙:中南大学,2012.
[5]王志滨,陈靖,谢恩普,等.圆端形钢管混凝土柱轴压性能研究[J].建筑结构学报,2014,35(7):123-130.
[6]谢恩普,王志滨,林盛,等.圆端形钢管混凝土轴压短柱机理分析[J].福州大学学报(自然科学版),2013,43(4):517-522.
[7]付磊,丁发兴,谷利雄,等.圆端形钢管内约束混凝土轴压短柱的力学性能[J].华南理工大学学报(自然科学版),2014,42(11):113-120.
[8] DING F X,FU L,YU Z W,et al.Mechanical performances of concrete-filled steel tubular stub columns with round ends under axial loading[J].Thin-Walled Structures,2015,97:22-34.
[9]李锦华,王二磊.圆端形钢管混凝土偏压构件受力性能研究[J].武汉理工大学学报,2016,38(4):50-53.
[10]沈奇罕.椭圆钢管混凝土轴压、偏压和抗弯性能与破坏机理研究[D].合肥:合肥工业大学,2016.
[11]宋顺龙,王静峰,江汉,等.椭圆钢管混凝土受扭性能及抗扭承载力计算[J].合肥工业大学学报(自然科学版),2017,40(7):952-959.
[12]沈奇罕,王静峰,王伟.基于数值分析的椭圆钢管混凝土柱轴压性能及承载力计算[J].建筑钢结构进展,2015,17(6):68-78.
[13] ZHAO X L,PACKER J A.Tests and design of concretefilled elliptical hollow section stub columns[J].ThinWalled Structures,2009,47:617-628.
[14]韩林海.钢管混凝土结构理论与实践[M].2版.北京:科学出版社,2007:67-76.