本文依据: (1) 由平面格构模型发展而来的平面板梁模型和原板理论; (2) 半波正弦荷载的等作用量原则; (3) 内力横向分配概念,提出了平面曲线形箱梁桥为基础的形箱梁桥内力横向分配计算方法,解决了它的最大活载内力计算问题,同时也大大简化了这种梁的恒载内力计算。本法可以代替弹性薄壁杆理论,作为直的或曲的、单箱或多箱或分离箱式箱形梁桥的基本设计工具。 This paper is based on (1) the planar plate beam model and the original plate theory developed from the planar lattice model, (2) the principle of equal load of half-wave sinusoidal load, (3) the concept of transverse distribution of internal forces, The calculation method of horizontal distribution of internal force of the box girder bridge based on the beam bridge solves its calculation problem of the maximum live load internal force and greatly simplifies the calculation of the internal force of the beam under constant load. This Act supersedes the theory of elastic thin-walled bars as a basic design tool for straight or curved single-box or multi-box or split box-type girder bridges.