闻  洋^1,2，郝铭科³
    （1 北京科技大学土木与环境工程学院，北京100083；2 内蒙古科技大学建筑与土木工程学院，包头014010；3 包头钢铁（集团）公司，包头014010）

[摘要] 以混凝土强度和约束效应系数为主要变化参数，对8根钢骨-钢管混凝土组合柱的工作机理、延性和极限承载力进行了试验研究，分析了影响这种组合柱性能的主要因素。研究结果表明，组合柱的承载能力随着混凝土强度等级的提高而逐渐提高；轴压组合柱的承载能力随着约束效应系数的增大而逐渐提高。由于钢管、钢骨和核心混凝土的协同工作，可大幅地提高柱子的承载能力，延缓和抑制核心混凝土中剪切斜裂缝的出现和开展，提高了柱的延性。
[关键词] 组合柱；轴压；承载力；约束效应系数

Analysis ofinfluencing factor of steel tube column filled with steel-reinforced concrete in axially loading
Wen Yang^1,2,  Hao Mingke³
(1 Civil&Environment Engineering School, University of Science and Technology Beijing, Beijing 100083, China; 2 The School of Architecture &Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; 3 Baotou Iron&Steel  (Group)   Co., Ltd., Baotou 014010, China)

Abstract: Through bearing capacity experimentation of 8  composite columns in axially loading, the working mechanisms, ductility and ultimate bearing capacity were studied. The effect of the grade of core concrete and confinement coefficient were discussed. Results show that the bearing capacity of composite column is enhanced g/adually with the increase of concrete strength and confinement coefficient. The load-beanng capacity and ductility of the composite column are improved, and the propagation of crack in concrete is mitigated effectively as concrete and steel work together.
Keywords: composite column; axial compression; load-bearing capacity; confinement coefficient