Relative humidity plays a critical role in concrete creep. To accurately measure and model creep behavior of concrete considering the relative humidity effect is difficult despite more than 100 years of research of concrete creep. In this study, a test set-up was designed to measure the creep-induced deflection of concrete beams exposed to different drying conditions (sealed and symmetric drying). A numerical method is proposed to quantify the creep parameters of concrete considering the relative humidity effect. The sequential coupled hydromechanical finite element analysis was conducted to back-calculate the creep parameters in the microprestress solidification theory-based creep model from the measured creep-induced deflection. It was found that the obtained parameters are independent of the loading and drying conditions. One set of parameters can predict the creep-induced deflection of concrete beams exposed to different drying conditions. The findings in this study provide a new methodology to obtain the creep parameters which can be implemented numerically for analyzing creep behavior of various concrete structures without considering the drying-related size effect.

相对湿度在混凝土蠕变中起关键作用。尽管有100多年的混凝土蠕变研究，但考虑相对湿度效应来精确测量和建模混凝土的蠕变行为仍然很困难。在这项研究中，设计了一个测试装置来测量暴露于不同干燥条件（密封和对称干燥）的混凝土梁的蠕变引起的挠度。提出了一种考虑相对湿度效应来量化混凝土蠕变参数的数值方法。进行了顺序耦合流体力学有限元分析，以根据测得的蠕变引起的挠度反算基于微预应力凝固理论的蠕变模型中的蠕变参数。发现所获得的参数与装载和干燥条件无关。一组参数可以预测混凝土梁在不同干燥条件下的蠕变引起的挠度。这项研究的发现为获得蠕变参数提供了一种新的方法，该方法可以通过数值实现来分析各种混凝土结构的蠕变行为，而无需考虑与干燥有关的尺寸效应。