（杨凌职业技术学院建筑工程分院， 杨凌 712100）

［摘要］为研究钢管混凝土核心柱这一组合柱的轴压力学性能，以组成组合柱的钢管混凝土和管外箍筋约束混凝土两部分的应力-应变关系为基础，外围箍筋约束混凝土应用Mander本构模型，视钢管混凝土为一种组合材料，基于静力平衡及变形协调，推导了外围箍筋对其内混凝土平均约束应力，分析了组合柱轴压荷载-变形曲线规律，讨论了箍筋约束混凝土峰值应变小于以及大于钢管混凝土屈服应变时该柱轴压承载力，建议了钢管混凝土核心柱轴压极限承载力计算方法，经与47个试件试验结果对比，吻合良好。

［关键词］钢管混凝土核心柱；  荷载-变形曲线； 轴压； 承载力

中图分类号：TU398文献标识码：A文章编号：1002-848X(2017)19-0093-04

Analysis on axial compression ultimate bearing capacity of  concrete-filled steel tubular composite column

Liu Jie

(Department of Architectural Engineering， Yangling Vocational and Technical College， Yangling 712100, China)

Abstract:In order to study the axial compressive mechanical properties of concrete-filled steel tubular composite columns, based on the stress-strain relationship between the concrete-filled steel tube and external concrete confined with stirrups, Mander constitutive model was adopted for external concrete confined with stirrups, and the concrete-filled steel tube was regarded as a kind of composite material. Based on the static balance and deformation coordination, the average restraint stress of the concrete by external stirrups was deduced, and the axial compression load-deformation curve law of the composite column was analyzed. The axial compression ultimate bearing capacity of the column was discussed when the peak strain of the concrete constrained by stirrups is less than and greater than that of the concrete-filled steel tube. The calculation method of the axial compression ultimate bearing capacity of concrete-filled steel tubular composite column was proposed, and the results were in good agreement with the test results of 47 specimens.

Keywords:concrete-steel tubular composite column; load-deformation curve; axial compression; bearing capacity

*陕西省教育厅2017年专项科学研究（17JK0880）。

作者简介：刘洁，硕士，副教授，Email：liu712100@163.com。