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为研究环境温度对预应力混凝土用钢绞线应力松弛性能的影响,选取了一种规格的预应力钢绞线,在5级试验温度环境下进行了应力松弛试验研究,并就温度对松弛率的影响及不确定度进行了评定。分析研究表明,温度对应力松弛率的影响非常明显,温度越高,松弛率越大;与试验温度为(20±1)℃状态下测得的松弛率相比,低温对松弛率的影响较高温时明显。不确定度评定结果有助于理解和认识预应力钢绞线松弛试验的各类影响因素。
In order to study the influence of ambient temperature on the stress relaxation behavior of prestressed concrete strand, a kind of prestressed steel strand was selected. Stress relaxation test was carried out in a five-stage test temperature environment. The relaxation rate The impact and uncertainty were assessed. The analysis shows that the effect of temperature on the rate of stress relaxation is very obvious. The higher the temperature, the higher the relaxation rate. Compared with the relaxation rate measured at the temperature of (20 ± 1) ℃, the effect of low temperature on relaxation rate Obvious when hot. Uncertainty assessment results help to understand and recognize all kinds of influencing factors of the prestressing strand relaxation test.