承受移动荷载的简支薄壁箱梁动力方程

运用第二类拉格朗日方程，对移动荷载作用下薄壁简支箱梁的振动问题进行了研究，导出以广义坐标为位移未知量的两组动力学方程，并用数值方法求得其解，用该法解决这一实用结构动力学问题具有公式统一化、未知量少、程序简单、计算省时等优点，本文的算例表明，方法是可靠的。

Derivation of the Equations of Motion for the Thin-Walled Box Girder Carrying Moving Loads by Lagrangian Method

In this paper, the equations of motion for the thin-walled box girder bearing moving loads are presented. Two groups of equations of motion with generalized coordinates as unknown displacements are derived and numerical solutions are obtained. Those equations of motion have a lot of advantages, such as unification of formulation, less unknowns, simplicity of needed computer program and less consumption of time for computation. Numerical examples show that the present method is reliable.