本文分析了预应力混凝土有限长圆管的弹性压缩损失,推导出一个公式概括了等配筋率和沿管长呈线性变化的变配筋率情况位移的计算,从而得到有效预压力的实用计算法,改正了苏联巴依柯夫的有限长圆管变配筋率情况有效预压力计算法的错误。概念清晰,方法简便,易为工程技术人员所掌握。 In this paper, the elastic compression loss of the prestressed concrete finite-length tube is analyzed, and a formula is deduced that summarizes the calculation of the ratio of equal reinforcement ratio and the linear variation of the ratio of the reinforcement ratio along the length of the tube, so as to obtain a practical calculation method for the effective preload. Corrected the error of the effective pre-stress calculation method for the Soviet Union’s Barykov’s limited length of pipe. The concept is clear, the method is simple and easy for engineers and technicians to master.