Method for including restrained warping in traditional frame analyses

[摘要] Restrained warping is important for the torsion deformation and axial stresses of thin-wall open sections. However, this phenomenon is not included in commonly used frame analysis programs. This paper presents a simple method to include the effect of restrained warping of member ends in a frame analysis. In this method, prior to the frame analysis the structural designer increases the section torsion stiffness by a factor. After the analysis the structural designer obtains the extreme bi-moments and axial stresses from the computed torsion moment. The method is demonstrated in three examples. The importance of restrained warping is shown.

[学科分类] 建筑学

[关键词] Torsion;frame analysis;restrained warping;design method