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为研究循环荷载加大混凝土徐变的内因,以循环荷载和恒荷载下混凝土徐变试验结果为基础,基于多孔介质理论的混凝土徐变模型,编制了徐变模拟分析程序,在细观尺度下模拟了受循环荷载作用的混凝土内部骨料、砂浆与水的耦合过程,得到了宏观尺度下模型内部节点位移过程图、细观尺度下水分流速分布图、孔隙压力消散过程图、等效应力变化图。研究结果表明:(1)数值模拟方法可以描述细观尺度下混凝土内部骨料、砂浆、水分的运动规律;(2)与恒定荷载相比,循环荷载通过影响水分的运动,加快了骨料与砂浆的内力重分布速度,推进了混凝土固相的受力均匀化的过程,从而加大混凝土徐变。
In order to study the internal factors that increase the creep of concrete by cyclic loading and based on the creep test results of concrete under cyclic loading and constant load, a creep simulation program based on porous media theory was developed. At the meso-scale The coupling process of internal aggregate and mortar with water under cyclic loading was simulated. The displacement process of the internal nodes of the model at macroscale, the flow distribution of moisture at mesoscopic scale, the process of pore pressure dissipation, the change of equivalent stress Figure The results show that: (1) The numerical simulation method can describe the movement law of aggregate, mortar and moisture inside the concrete at the mesoscopic scale; (2) Compared with the constant load, the cyclic loading can accelerate the movement of the aggregate, Mortar internal force redistribution speed, promote the solidification of concrete solidification process, thereby increasing the concrete creep.