一、问题的提出 1.目前环形预应力电杆结构设计计算是根据《钢筋混凝土结构设计规范》(TJ10—74)第106条(138)、(139)式计算的。计算方法是试算法,即确定计算截面的几何尺寸、钢材强度、混凝土标号之后,给出钢材用量和控制应力,再验算强度、抗裂度和挠度是否满足要求。这种方法比较麻烦,且算出的配筋值不一定经济合理,有探讨的必 1. Proposal of the problem 1. The calculation and calculation of the current structure of the circular prestressed pole is based on the formulae (138) and (139) of Article 106 of the “Code for Design of Reinforced Concrete Structures” (TJ 10-74). The calculation method is a test algorithm, that is, after determining the geometric size of the calculated section, the steel strength, and the concrete marking, the amount of steel used and the control stress are given, and then it is checked whether the strength, crack resistance and deflection meet the requirements. This method is troublesome, and the calculated reinforcement value is not necessarily economically reasonable.