中欧钢结构设计规范关于二阶效应的处理方法

采用中国与欧洲钢结构设计规范二阶效应理论对单跨3层和双跨5层钢框架二阶弯矩进行设计计算，并与有限元软件Midas/Gen的计算结果进行了比较。中国和欧洲钢结构设计规范均考虑了初始缺陷对二阶弯矩的影响，在理论计算中采用放大侧端弯矩的方法计算二阶效应，中国钢结构设计规范计算结果比有限元计算结果大2%~5%，欧洲钢结构设计规范计算结果比有限元计算结果大7%~15%，中国钢结构设计规范更契合工程实际的需要。

Treatment of Second-Order Effect in Chinese and European Codes for Design of Steel Structure

The steel frame of second-order moment of single-span three-layer，and double-span five-layer were designed and calculated by the second-order theory in Chinese and European codes for design of steel structure. The results were compared with those calculated using the finite element software Midas/Gen. The influences of the initial defects on second-order moment were considered in both Chinese and European specifications. However the method of amplifying the side end bending moment was adopted in the theory caculation, and the results by Chinese and European codes are respectively 2%-5% and 7%-15% more than those by the finite element calculation. We confirm that Chinese code is more in line with the actual needs of the project engineer.