型钢加固对称配筋小偏心受压柱简化计算方法

Simplified calculation method of symmetrically reinforced concrete columns strengthened with angle steel under small eccentric compression

针对《混凝土结构加固设计规范》(GB50367—2013)外粘型钢加固对称配筋小偏心混凝土受压柱正截面承载力计算公式较为繁琐的问题,提出了直线拟合简化方法,将截面抵抗矩系数计算公式简化为混凝土相对受压区高度的一次函数,计算型钢加固量时无须求解一元四次方程.直线拟合法计算值与截面抵抗矩系数的理论计算值较为接近,相对误差最大值为5.83%,通过该方法计算所得的型钢面积与文献试验结果符合较好,满足工程精度的要求,可以用于工程结构加固设计.

In ＂code for design of strengthening concrete structure（GB50367—2013）＂,the flexural bearing capacity formula of compression columns strengthened with angle steel is complicated and inconvenient to use.A linear fitting simplified method was presented.This method simplified calculation formula of section resistance moment coefficient into linear function with compression depth,and thus a quadratic equation does not need to be solved.The maximum relative error between calculated value by the proposed formulas and theoretical analysis value of section resistance moment coefficient is 5.83%,which indicates that its calculated result is considerably close to theoretical results.The computed angle steel with the proposed method is in good agreement with the experimental results,meeting the requirement of engineering design.The method can be used to design concrete structure strengthened with angle steel.