Based on the theory of Vlasov, this paper proposed the method of spline Ritz to analyse the restrained torsion of thin walled bar with open section, combining the traditional Ritz method and spline function method.

• 提出了一类新的样条坐标矩阵。 同时在符拉索夫理论的基础上，结合传统的里兹法，利用样条函数提出了开口薄壁杆件约束扭转计算的样条里兹法。