材料在长期保持拉应力时，出现应力逐渐缓慢下降的现象为应力松弛。这种损失量相对初应力的比例就是应力松弛率。通过特殊加工可以改善这种特性，实现更低的松弛率，这就是低松弛概念的基本含义。 对于预应力钢绞线，标准的应力松弛试验条件为20度，初应力为公称最大力的70%（60%和80%极少采用），低松弛级别要满足1000小时应力松弛率不大于2.5%的要求，普通松弛的这个指标为8%，实际上长期松弛差异比这个要更大。
阐述获取预应力钢材低松弛性能的途径及其影响因素，并探讨其机理。
To expound the approach to get low relaxation property of prestress steel products and its effect factors, and the mechanism is discussed.
大跨度桥梁采用低松弛镀锌PC钢绞线具有施工简便、造价低等优点。
Its profits are convenient construction and low cost that the wide span bridge is built by the low relaxation prestressed galvanized PC steel strand.
报道了对我国低松弛预应力钢丝所进行的试验研究，包括不同初始应力、时间对松弛的影响。
This paper gives an account of the experimental study on the stress relaxation in low relaxation prestressing wires. The influence of the initial stress and the duration of loading is discussed.
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