摘要
在合理确定钢和混凝土本构模型基础上,运用有限元数值分析软件ABAQUS模拟典型圆端形钢管混凝土双向偏压柱的荷载-变形曲线,开展工作机理分析.分析结果显示:在双向偏压荷载作用下,圆端形钢管混凝土柱能表现出较高的极限承载力和延性;钢管对核心混凝土可起到有效约束作用,圆弧段钢管对混凝土的约束效应高于平直段钢管.典型算例表明圆端形钢管混凝土双向偏压柱的M_x/M_(ux)-M_y/M_(uy)相关曲线呈四分之一椭圆形.最后提出该类双向偏压柱承载力的简化计算式,与有限元模拟结果对比,简化计算结果偏于保守.
After models of the steel and the core concrete were verified, the finite element(FE) software ABAQUS was used to simulate the load-deformation curves of the round-end concrete-filled steel tubular(RECFST) columns subjected to the biaxial eccentric compression. Meanwhile, the mechanic analysis were carried out. The research results show that, the RECFST columns exhibit high bearing capacity and ductility under the biaxial eccentric compression. The steel tube can effectively confine core concrete, and the confining effect from the arc segment of steel tube is higher than that of the flat segment. Typical examples show that the M_x/M_(ux) and M_y/M_(uy) curves of RECFST columns subjected to the biaxial eccentric compression are quarter-ellipses. Finally, simplified formulas for predicting the strength of RECFST columns subjected to the biaxial eccentric compression were proposed. Compared with FE results, the results using simplified formulas are conservative.
引文
[1] 韩林海.钢管混凝土结构:理论与实践[M].3版.北京:科学出版社,2015.
[2] 王志滨,陈靖,谢恩普,等.圆端形钢管混凝土柱的轴压性能研究[J].建筑结构学报,2014,35(7):19-26.
[3] 谷利雄,丁发兴,付磊,等.圆端形钢管混凝土轴压短柱受力性能研究[J].中国公路学报,2014,27(1):57-63.
[4] 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.
[5] 李培鹏,任志刚.圆端形钢管混凝土短柱轴压性能仿真分析[J].武汉理工大学学报,2014,36(9):96-101.
[6] 高扬虹.圆端形钢管混凝土柱的压弯力学性能研究[D].福州:福州大学,2018.
[7] SHEN Q H,WANG J F,WANG W Q,et al.Performance and design of eccentrically-loaded concrete-filled round-ended elliptical hollow section stub columns[J].Journal of Constructional Steel Research,2018,150:99-114.
[8] 王静峰,於忠华,沈奇罕,等.圆端形椭圆钢管混凝土受扭性能数值分析及抗扭承载力计算[J].建筑科学与工程学报,2018,35 (3) :7-15.
[9] TAO Z,WANG X Q,UY B.Stress-strain curves of structural and reinforcing steels after exposure to elevated temperatures[J].Journal of Materials in Civil Engineering,2013,25(9):1306-1316.
[10] LIU F,WANG Y,CHAN T M.Behaviour of concrete-filled cold-formed elliptical hollow sections with varying aspect ratios[J].Thin-walled Structures,2017,110:47-61.