钢框架柱考虑侧移效应的弯矩放大系数实用公式

Practical approach of magnification factor of moment considering second-order effect of steel frame column

在现行钢结构设计规范的基础上,结合无支撑纯框架柱二阶近似弹性分析的二阶弯矩放大系数,提出了用于弱支撑框架柱考虑侧移效应的二阶近似弯矩放大系数实用公式。实用公式充分考虑了柱端约束条件、作用于柱上的荷载、柱刚度以及长细比等因素的影响,用于设计更加合理。

It presented a practical approach for calculating the approximate second-order elastic moment of the partially-braced frame column, based on the present design code of steel structures and the approximate magnification factor of second-order moment of unbraced frame column. This approach accounted for the end restraints of column, axial load applied on the column, flexural stiffness and slenderness. It was demonstrated that the proposed approach is reliable and valid.