混凝土循环受压细观模型的参数研究
A parametric study of the meso-scale modelling of concrete subjected to cyclic compression
摘要：
目前的参数研究涉及混凝土的细观模拟循环压缩，表现出滞后回线在卸载和再加载。混凝土被理想化为由骨料、砂浆和界面过渡区（ITZ）组成的二维三相复合材料。中尺度建模方法依赖于这样的假设，即滞后回线是由局部永久位移引起的，这会导致卸载和重新加载过程中的非线性断裂过程。进行了参数研究，调查如何聚集体密度和大小，在ITZ和砂浆的永久位移量，和ITZ强度的影响与细观尺度建模方法获得的滞后回线。
英文摘要：
The present parametric study deals with the meso-scale modelling of concrete subjected to cyclic compression, which exhibits hysteresis loops during unloading and reloading. Concrete is idealised as a two-dimensional three-phase composite made of aggregates, mortar and interfacial transition zones (ITZs). The meso-scale modelling approach relies on the hypothesis that the hysteresis loops are caused by localised permanent displacements, which result in nonlinear fracture processes during unloading and reloading. A parametric study is carried out to investigate how aggregate density and size, amount of permanent displacements in the ITZ and the mortar, and the ITZ strength influence the hysteresis loops obtained with the meso-scale modelling approach.
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