杨  政，  侯  健，  邱明星
    （西安交通大学土木工程系，西安710049）

[摘要] 通过对采用不同强度等级钢筋和混凝土的轴心受压短柱的受力过程进行分析，研究了钢筋强度、混凝土强度以及配筋率对钢筋混凝土短柱最大承载力的影响。分析结果表明：由于钢筋和混凝土的非线性性能，受压钢筋混凝土短柱的最大承载力并不总是等于混凝土和钢筋两种材料各自最大承载力之和；钢筋混凝土短柱的最大承载力取决于钢筋、混凝土的力学性能以及短柱的配筋率，其值有可能小于混凝土和钢筋最大承载力之和；短柱最大承载力与混凝土和钢筋最大承载力之和的差值取决于钢筋、混凝土的力学性能和截面的配筋率。分析还表明，数值分析得到的钢筋混凝土短柱承载力比按我国现行规范计算得到的承载力大3% ~10%，采用规范的方法计算钢筋混凝土短柱的承载力是偏于安全的。
[关键词] 钢筋混凝土；短柱；轴心受压；承载力
中图分类号：TU375.3    文献标识码：A  文章编号：1002-848X(2011) S2-0150-06

    Analysis on bearing capacity of axially compressed RC short columns
    Yang Zheng, Hou Jian, Qiu Mingxing
    ( Department of Civil Engineering,  Xi' an Jiaotong University,  Xi' an 710049,  China)

Abstract: The bearing capacity of axially compressed RC shoIt columns was calculated by numerical method, the effect of the strength of reinforcement and concrete, and ratio of reinforcement on the maximal bearing capacity was investigated. The results show that the maximal bearing capacity of shoIt columns is not always equal to the sum of the maximal bearing capacity of two materials due to the nonlinear mechanical behavior of reinforcement and concrete. The maximums are dependent on the mechaIucal property of reinforcement and concrete and ratio of reinforcement, and the maximums may be less than the sum of the maximal bearing capacity of reinforcement and concrete. In comparison with the applied code for design of concrete structures, it is shown that the maximal bearing capacity based on numerical method is 3 percent t0 10 percent larger than that based on the applied code, and the values of bearing capacity based on the applied code are safe.
Keywords: reinforced concrete; short column; axially compression; bearing capacity