(北京市建筑设计研究院有限公司， 北京 100045)

［摘要］以某实际工程为例，介绍了应用直接分析法进行异形钢结构设计的步骤及方法。提出一种新的适用于曲线受压构件的分布式屈曲初始单位力施加方式对本例进行线性屈曲分析，确定本例异形受压格构柱的计算长度系数。将直接分析法的结果与传统计算长度系数法进行对比，验证了直接分析法在此类钢结构设计中的适用性。总结了直接分析法应用在异形钢结构设计中的优点，并指出了该法现阶段在确定构件最不利内力时，尚存在的不足。 

［关键词］异形钢结构；直接分析法；计算长度系数法；初始缺陷；非线性分析 

中图分类号：TU311, TU391 文献标识码：A文章编号：1002-848X(2021)19-0121-05

Application of direct analysis method in designing irregular shaped steel structures and its comparison to effective length factor method 

GAO  Ming,  TIAN  Jin 

(Beijing Institute of Architectural Design, Beijing 100045， China) 

Abstract: Taking a practical project as an example, the steps and methods of applying direct analysis method in designing irregular shaped steel structures were introduced. A new distributed initial unit force method in linear buckling analysis for curve-compressed members was proposed to calculate the effective length factors of the irregular shaped latticed columns in this case. The results of direct analysis method and effective length factor method were compared, which verifies the applicability of direct analysis method in the design of this type of steel structures. The advantages of direct analysis method in the design of irregular shaped steel structures were summarized and the imperfection in determine the most dangerous internal forces for structural members of the method was discussed. 

Keywords:irregular shaped steel structure； direct analysis method； effective length factor method； initial defect； nonlinear analysis

作者简介：高鸣，硕士，高级工程师，一级注册结构工程师，Email：gaomingbj@163.com。