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方钢管混凝土短柱轴压极限承载力计算方法分析*
刘洁1,王正中2
摘 要
(1 杨凌职业技术学院建筑工程分院, 杨凌 712100; 2 西北农林科技大学水利与建筑工程学院, 杨凌 712100)
 
[摘要]从方钢管对混凝土的约束机理出发,分析了组成方钢管混凝土短柱各部分的应力状态,将方钢管对核心混凝土的约束作用等效为有效侧向应力,利用复杂应力下钢材及混凝土极限(屈服)条件,基于极限平衡理论,建立了柱截面的力学平衡方程,推导了该柱的轴压极限承载力计算公式。应用推导公式对42根方钢管混凝土短柱试件的轴压承载力进行计算,比较计算结果与试验结果,两者吻合良好。
[关键词]方钢管混凝土; 轴心受压; 极限承载力; 极限平衡法
中图分类号:TU398     文献标识码:A      文章编号:1002-848X(2015)10-0021-05
 
Analysis on calculating method of ultimate bearing capacity of concrete-filled square steel tube
short columns under axial load
Liu Jie1, Wang Zhengzhong2
(1 Department of Architectural Engineering, Yangling Vocational and Technical College, Yangling 712100, China; 2 College of Water Conservancy and Construction Engineering, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China)
 
Abstract: Based on the constraint mechanism of concrete from the square steel tube, the stress states of various parts of concrete-filled square steel tube columns were analyzed. The restraint effect of core concrete from square steel tube was equivalent for the effective lateral stress. Using ultimate (yield) conditions of steel and concrete under the complex stress, mechanical equilibrium equation of columns section was established based on the limit equilibrium theory. And the calculation formula of axial compression ultimate bearing capacity of the columns was derived. The axial compression bearing capacities of 42 concrete-filled square steel tube columns were calculated using proposed formula. Results show that the test results are in good agreement with the calculation results.
Keywords:concrete-filled square steel tube; axial compression; ultimate bearing capacity; limit equilibrium method
*国家自然科学基金项目(51179164)。
作者简介:刘洁,博士研究生,副教授, Email: liu712100@163.com。
 
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