Differential governing equations of trapeziform box girder is yielded by using the principle of the stationary value of total potential energy.

• (2)分析了箱梁剪力滞效应产生的原因,用最小势能原理推导出梯形截面箱梁的剪力滞效应的控制微分方程,并应用FORTRAN语言编制相应的计算程序。