根据弹性地基直梁和圆弧曲梁内力和位移的计算公式，编制了相应计算程序，并应用于盘石头水库电站输水隧洞岔管的结构分析。岔管计算断面简化为等截面直梁和圆形曲梁的组合结构，计算了4种工况下关键点的内力，为岔管的配筋设计提供依据。

On the basis of the internal force and deformation formulas of straight and curved elastic foundation beams，a program is organized and applied to structure stress analysis of the reinforced concrete bifurcation pipes of the underground penstocks in Panshitou Reservoir. The computational section of the bifurcation pipe is simplified to a combination structure of uniform ?straight beams and circular curved beams.The internal forces at key points under four kinds of working conditions are calculated, the results provide foundation for the reinforcement design of the bifurcation pipes.