考虑随机性的徐变参数敏感度及其时变规律

发布时间：2018-06-15 11:21

本文选题：徐变 + 参数变异　；参考：《应用基础与工程科学学报》2014年04期

【摘要】：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.
[Abstract]:A sensitivity analysis method of parameter randomness is proposed for stochastic and multi parameter systems. By statistics, sampling, regression and correlation analysis of parameter samples, the effect of parameter dimension and variation on the results is removed, and the parameter sensitivity is obtained by using the path coefficient, partial correlation coefficient and cumulative sensitivity. Methods the sensitivity of 5 kinds of creep parameters, such as relative humidity, theoretical thickness, concrete compression strength, temperature and loading age, was analyzed from 8585 samples measured and collected from 9 construction sites. The results show that the creep coefficient is negatively related to the relative humidity of the environment, the theoretical thickness, the compressive strength of concrete and the age of loading, and the temperature is the same as the temperature. There is a positive correlation. Among them, the sensitivity of the ambient relative humidity is the most, and then the loading age, temperature, theoretical thickness and strength. The study also shows that the aging properties of the above 5 parameters are not obvious.
【作者单位】：广州大学淡江大学工程结构灾害与控制联合研究中心;广东高校结构安全与健康监测工程技术研究中心;广州市结构安全与健康监测重点实验室;暨南大学网络与教育技术中心;
【基金】：国家自然科学基金青年科学基金(51208124) 高等学校博士学科点专项科研基金(20114410120003) 珠江科技新星专项(2012J2200093) 广东省科技计划项目(2012B031500025)
【分类号】：U448.33;U441

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