（1 东北石油大学黑龙江省高校防灾减灾工程与防护工程重点实验室， 大庆 163318； 2 香港理工大学土木与环境工程系， 香港 999077； 3 东北林业大学工程技术学院， 哈尔滨 150000）

［摘要］为研究矩形钢管混凝土翼缘的H型蜂窝组合柱（STHCC）的整体稳定性能，以套箍系数、试件长度、名义长细比、混凝土强度等级及截面尺寸为控制参数，设计了30根不同参数的STHCC试件。基于简化的钢材本构模型及考虑套箍效应的混凝土非线性本构模型，利用ABAQUS有限元软件建立19根钢管混凝土柱（CFST)的有限元模型，引入初始缺陷（特征值屈曲一阶模态的1/1 000），开展试件的非线性屈曲分析，将有限元数值解与试验数据进行对比，两者吻合较好，验证了有限元建模方法的合理性。基于此开展30根STHCC试件非线性屈曲分析，提取相应的荷载-位移曲线，考察屈曲荷载随套箍系数、试件长度、名义长细比、混凝土强度等级及截面尺寸的变化规律。结果表明：套箍系数及试件长度对轴压长柱的稳定承载力影响更加明显。最后，依据有限元数值解建立考虑初始缺陷情况下STHCC组合长柱的稳定承载力计算表达式，提出该类轴压长柱的设计方法与设计建议。

［关键词］H型蜂窝组合柱； 钢管混凝土； 非线性屈曲； 初始缺陷；  稳定承载力； ABAQUS软件

中图分类号：TU323-1文献标识码：A文章编号：1002-848X(2018)15-0050-06

Nonlinear buckling analysis of H-type honeycombed composite column with rectangular concrete-filled steel tube flanges

Ji Jing1,2, Xu Zhichao1，3, Jiang Liangqin1, Zhang Yunfeng1, Zhou Lijian1, Teng Zhenchao1, Liu Yingchun1, Lu Zhaohong1

(1 Heilongjiang Key Laboratory of Disaster Prevention, Mitigation and Protection Engineering, Northeast Petroleum University, Daqing 163318, China; 2 Department of Civil and Environmental Engineering, Hong Kong Polytech University, Hongkong 999077, China; 3 College of Engineering and Technology,  Northeast Forestry University, Harbin 150000, China)

Abstract:In order to study the overall stability of H-type honeycombed composite columns with rectangular concrete-filled steel tube flanges (STHCC), the hoop coefficient, the length of specimens, nominal slenderness ratio, the strength grades of concrete and sectional size were taken as the main parameters，30 STHCC specimens with different parameters were designed. Based on the simplified constitutive model of steel and nonlinear constitutive model of concrete considering hoop effect, the finite element model of 19 concrete-filled steel tube(CFST) specimens were established by ABAQUS, then the nonlinear buckling analysis was carried out by adding initial imperfection which is the 1/1 000 of the first mode of eigenvalue buckling analysis. Through comparing the finite element simulated and experimental results, both were in good agreement, so the rationality of the finite element model was verified. The nonlinear buckling analysis of 30 STHCC was carried out in the further and the curve of the buckling load and deformation were extracted. The variation rule of buckling load with the hoop coefficient, the length of specimens, the nominal slenderness ratio, the strength grades of concrete and the sectional size were investigated. Then, the results show that the influence of hoop coefficient and the length of the specimens on the stability bearing capacity are more obvious. Finally, the calculation formula for the nonlinear buckling load of  STHCC is established based on the finite element simulated results and the design method of this kind of long column under axial compression are presented.

Keywords:H-type honeycombed composite column; concrete-filled steel tube; nonlinear buckling; initial imperfection; stable bearing capacity; ABAQUS software