Considering the effect of the randomness of concrete strength and relative humidity on concrete creep
Considering the effect of the randomness of concrete strength and relative humidity on concrete creep
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考虑混凝土强度和相对湿度的随机性对混凝土徐变的影响
DOI：
10.1002/suco.202000139
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发表时间：
--
影响因子：
3.2
通讯作者：
Yu Zhiwu
中科院分区：
文献类型：
--
作者：
Zheng Zhihui;Hu Di;Liu Peng;Sha Fei;Liu Lei;Yu Zhiwu
对不同强度的混凝土在不同环境相对湿度下的徐变进行了试验研究。基于CEB-FIP Model Code 1990和Model Code 2010中混凝土徐变的确定性模型，采用拉丁超三次抽样法建立了混凝土徐变的不确定性模型，并分析了混凝土强度和环境相对湿度对模型的敏感性。试验结果表明，徐变系数与混凝土强度和环境相对湿度呈负相关，且后者对徐变的影响大于前者。此外，CEB-FIP MC 90和MC 2010模型对环境相对湿度和混凝土强度的敏感性随系数的变化而变化。在不同环境条件下，蠕变试验数据与确定蠕变模型的理论值存在偏差，但试验数据均在CEB-FIP MC 90模型的95%置信区间内，说明本文提出的计算蠕变系数95%置信区间的数值方法是可靠的。
Experimental research on concrete creep with different strengths under various ambient relative humidity was carried out. Based on certainty creep models provided in CEB‐FIP Model Code 1990 and Model Code 2010, the Latin hypercubic sampling method was used to establish uncertainty models of concrete creep, and the sensitivity of concrete strength and ambient relative humidity to models was analyzed. Experimental results show that the creep coefficient has a negative correlation with concrete strength and ambient relative humidity, and the latter influences creep more than the former. In addition, the sensitivity of ambient relative humidity and concrete strength for CEB‐FIP MC 90 and MC 2010 models changes with the variation of coefficients. Under different environmental conditions, there is deviation between the tested creep coefficients and theoretical values by certainty creep models, while the experimental data are within the 95% confidence interval of CEB‐FIP MC 90 model, indicating that the presented numerical method for calculating the 95% confidence interval of the creep coefficient is reliable.