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    聞  洋^1,2，郝銘科³
    （1 北京科技大學(xué)土木與環(huán)境工程學(xué)院，北京100083；2 內(nèi)蒙古科技大學(xué)建筑與土木工程學(xué)院，包頭014010；3 包頭鋼鐵（集團(tuán)）公司，包頭014010）

[摘要] 以混凝土強(qiáng)度和約束效應(yīng)系數(shù)為主要變化參數(shù)，對8根鋼骨-鋼管混凝土組合柱的工作機(jī)理、延性和極限承載力進(jìn)行了試驗(yàn)研究，分析了影響這種組合柱性能的主要因素。研究結(jié)果表明，組合柱的承載能力隨著混凝土強(qiáng)度等級的提高而逐漸提高；軸壓組合柱的承載能力隨著約束效應(yīng)系數(shù)的增大而逐漸提高。由于鋼管、鋼骨和核心混凝土的協(xié)同工作，可大幅地提高柱子的承載能力，延緩和抑制核心混凝土中剪切斜裂縫的出現(xiàn)和開展，提高了柱的延性。
[關(guān)鍵詞] 組合柱；軸壓；承載力；約束效應(yīng)系數(shù)

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