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由于等张力缠绕的缺点，予应力钢丝缠绕机架一般均采用变张力缠绕。其优点是各层钢丝的应力趋于一致，钢丝层的设计接近等强设计。目前采用的变张力缠绕方法，不考虑钢丝工作应力，在某些条件下分布不均匀的特点，因而往往达不到等强设计的目的。本文具体分析了机架尺寸、吨位、摩擦力对钢丝工作应力分布的影响，提出了适合不同机架的变张力缠绕方法，即Ａ型和Ｂ型变张力缠绕： （１）Ａ型：适合立柱较长，钢丝层数较少的机架，此时可以不考虑钢丝工作应力分布的不均匀性； （２）Ｂ型：适合立柱较短，钢丝层数较多的机架 本文还提出了选择变张力缠绕方法的判别式，及计算工作应力的公式和图表，使变张力设计较为简捷和合理。 本文提出的各种钢丝应力计算公式是以实测数据为依据，因而具有一定的可靠性。本文还将推导的工作应力计算公式与国外资料对比分析。
Due to the shortcomings of equal tension winding, the prestressing wire winding rack generally adopts variable tension winding. The advantage is that the stress of each layer of steel tend to be consistent, the design of the steel layer is close to isosceles design. The currently used variable tension winding method, without considering the work of wire stress, uneven distribution in some conditions, which often fail to achieve the purpose of equal strength design. In this paper, the influence of frame size, tonnage and friction on the working stress distribution of steel wire is analyzed in detail. A method of variable tension winding suitable for different racks is proposed, that is, Longer, fewer layers of steel wire, at this time can not consider the work of steel wire distribution of stress non-uniformity; (2) B type: suitable for shorter columns, the number of steel wire rack This paper also made a choice Variable tension winding method of discriminant, and calculate the working stress formulas and charts, so that variable tension design is relatively simple and reasonable. The formulas for calculating the stress of steel wire presented in this paper are based on the measured data and therefore have certain reliability. In this paper, we also compare the working stress formula deduced with foreign data.