开口厚壁截面短构件的约束扭转

为了分析开口厚壁截面短构件的约束扭转问题，采用统一分析梁模型与有限节线法，对T形和L形厚壁截面短构件约束扭转时横截面的翘曲和应力分布情况等问题进行了分析研究.算例计算结果表明：开口厚壁截面短构件存在与其横截面形心位置不一致的扭转（弯曲）中心，构件在不过扭转中心的外力作用下会产生弯扭耦合变形，其横截面将产生不均匀翘曲，横截面上的翘曲正应力和扭转剪应力均呈非线性分布.

THE RESTRAINED TORSION OF THICK-WALLED OPEN-SECTION SHORT MEMBER

In order to analyze the restrained torsion of a thick-walled open-section short member, the warpings and the stress distributions of a T-shaped short member and an L-shaped short member due to restrained torsion are determined by employing a unified analytical beam model and a finite nodal-line method. The computational results of examples show that:a thick-walled open-section short member has a torsional (bending) center that does not coincide with its cross-section centroid; when the torque or horizontal loadings do not pass through the torsional center, the member will have a coupling deformation consisting of bending and torsional deformations, and its cross section will undergo an uneven warping, and the warping normal stress and the torsional shear stress on the cross section will have nonlinear distributions.