A transformed B3 spline function was used to simulate the warping displacements along the cross section of the thin-walled members.

• 方法采用转换B3样条函数模拟杆件横截面的翘曲位移场，并考虑了杆壁中面上剪切变形的影响，能很好地描述剪力滞后现象。