从能量原理的 Ritz- Tim oshenko法出发 ,推导出了变截面空心薄壁桥墩的稳定临界力的计算方法。主要研究了一端固支一端自由和一端固支一端链杆铰支两种边界条件情况 ,提出了失稳临界荷载的计算公式 ,并通过算例验证了公式的计算精度能满足设计需要 Based on the Ritz-Timoshenko method of energy theory, a method of calculating the critical stability of a thin-walled piers with variable cross section is derived. Mainly studied two kinds of boundary conditions, one end free-buckling and one end fixed-end hinge, and proposed the calculation formula of the critical load of instability, and verified by examples that the formula can meet the design requirements