[提要]  本文提出了既适用于方钢管砼轴压长柱又适用于中短柱承载力计算的切线模量理论方法，并给出了简化的解析计算式，便于设计参考。
[关键词]  方钢管砼柱 轴压 切线模量理论

A computation method of critical loading for concrete filled square steel tubular columns' based on tangential modulus theory is presented, and the simplified method suitable for both long and middle -short columns is also presented which can be applied to practical design.
Keywords: concrete filled square steel tubular columns;a xial compression; tangential modulus theory