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 grid beam method for calculating the second system stresses of orthotropic steel plate bridge deck with trapezoidal longititudal ribs is introduced in this paper. The rigidities of equivalent distribution beams are derived; the structure analysis program of the orthotropic steel plate bridge deck is written; and the second system stresses are analyzed. Furthermore, the results obtained with the equivalent grid beam method are compared to those obtained with the traditional Peklian Esslinger method to verify its reliability.