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针对随机、多参数系统提出了一种考虑参数随机性的敏感度分析方法.通过对参数样本进行统计、抽样、回归和相关分析,去除参数量纲和变异度对结果的影响,获得以通径系数、偏相关系数和累计敏感度为衡量指标的参数敏感度.利用该方法,结合从9个施工现场实测和收集到的8585个样本,分析环境相对湿度、理论厚度、混凝土抗压强度、温度和加载龄期5种徐变参数的敏感度.结果表明,徐变系数与环境相对湿度、理论厚度、混凝土抗压强度和加载龄期成负相关,与温度成正相关.其中,环境相对湿度的敏感度最大,然后依次是加载龄期、温度、理论厚度和强度.研究同时发现,上述5种参数敏感度的时效性并不明显.
A sensitivity analysis method considering the randomness of parameters is proposed for stochastic and multi-parameter systems. By statistical, sampling, regression and correlation analysis of parameter samples, the influence of parameter dimension and variation degree on the results is removed, Coefficient, partial correlation coefficient and cumulative sensitivity were used to measure the parameter sensitivity.According to the 8585 samples measured and collected from 9 construction sites, the relative humidity, theoretical thickness, compressive strength of concrete, temperature And loading age.The results show that the creep coefficient is negatively correlated with the relative humidity, theoretical thickness, compressive strength and loading age of concrete, and is positively correlated with temperature, of which the relative humidity The most sensitive, followed by loading age, temperature, theoretical thickness and strength.The study also found that the above five parameters sensitivity of the timeliness is not obvious.