介绍了采用梯形纵向加劲肋的钢桥面板第二体系应力计算的等效格子梁法，推导了等效分配梁的刚度，编写了正交异性板钢桥面的结构分析程序，分析了正交异性板的第二体系的应力，并将采用等效格子梁法得到的结果和传统的ＰｅｋｌｉａｎＥｓｓｌｉｎｇｅｒ 法相比较，验证其可靠性 The equivalent lattice girder method for calculating the stress in the second system of steel bridge deck with trapezoidal longitudinal stiffeners is introduced. The stiffness of the equivalent distributed girder is deduced. The structure analysis program of the orthotropic steel slab deck is presented. The stress of the second system of the opposite sex plate, and compare the result obtained by the equivalent lattice beam method with the traditional Peklian-Esslinger method to verify its reliability