(1 同济大学土木工程学院、土木工程防灾国家重点实验室，上海 200092；2 山东大学土建与水利学院，济南 250061；3 中国京冶工程技术有限公司，北京 100088)

［摘要］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。

［关键词］钢结构规范；弱支撑框架柱；二阶效应；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

Li Guoqiang1， Hou Hetao2， Hao Kunchao3

(1 School of Civil Eng.，State Key Laboratory for Disaster Reduction in  Civil Eng.,Tongji Uni., Shanghai 200092, China; 2 School of Civil Engineering, Shandong University, Jinan 250061, China; 3 China Jingye Engineering Corporation Limited，Beijing 100088, China)

Abstract: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.

Keywords:design codes of steel column; partially-braced frame column; second-order effect; magnification factor of moment; practical approach

*山东省优秀中青年科学家科研奖励基金(2006BS10004)，沈阳建筑大学省级重点实验室开放基金(JG200616)。

作者简介：李国强，教授，博士，Email: gqli@mail.tongji.edu.cn。