采取应力控制，伸长校核的原则，确保了预应力张拉施工的质量。

Thequality of prestressed stretching is guaranteed by the principle of stress control and stretch adjusting.

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预应力张拉施工中夹片、钢绞线和锚环之间存在着很大的摩擦阻力。

There is much prestressing loss for friction resistance among wedge, steel strand and anchor-ring in engineering.

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根据对弹性模量、非比例强度、抗拉强度和断裂伸长率的观察分析，提出了预应力钢丝张拉施工工艺的改进意见。

Some ideas on improvement in prestressing process are raised according to the observation and analysis on modulus of elasticity, apparent yield limit, tensional strength and percentage elongation.

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