本文在提出一种新型层合板壳单元的基础上,为适应箱形、T形等截面形式比较复杂的桥梁的有限元计算,提出了“虚拟层台单元”及“虚拟层” 的概念.本方法可大大减少单元数目,大幅度地提高计算效率,并可以十分容易地处理斜弯桥、变截面、变高度及复杂边界条件的问题,而且达到相当满意的精度,具有广泛的工程应用前景. In this paper, based on a new type of laminated plate element, in order to meet the finite element calculation of box-shaped and T-shaped cross-section more complicated bridges, the concepts of “virtual floor unit” and “virtual floor” are proposed. The method can greatly reduce the number of units and greatly improve the computational efficiency. The method can handle the problems of oblique curved bridges, variable cross sections, variable heights and complex boundary conditions very easily, and achieves quite satisfactory accuracy with wide application prospect.