混凝土细观力学研究进展综述

State-of-the-art literature review on concrete meso-scale mechanics

混凝土作为一种典型多相非均质材料,广泛应用于高层建筑、桥梁、大坝和核电站等工业与民用建筑。从其生产、运输、施工、养护到固化成形的完整过程,以及在复杂作用环境下的受力变形、损伤以至发生断裂破坏的非线性响应均取决于骨料、砂浆以及两者交界层面等细观层次组构的基本物理力学性能。本文对当前混凝土细观力学的研究现状进行综述,着重介绍了基于细观层次的混凝土试验研究、仿真预处理技术、数值模型和方法等方面的研究进展,并对混凝土破坏机理、尺寸效应、多尺度耦联以及率相关特性等领域的细观力学研究前沿给予阐述,文末总结和建议了混凝土细观力学有待拓展的研究方向。

As a typical multiphase heterogeneous material, concrete has been widely used in high-rise buildings, bridges, dams, nuclear power stations as well as other industrial and civil structures. The whole process of concrete production, transportation, construction, curing and hardening, and its nonlinear mechanical and deformation response subjected to complex loading environments are generally dominated by the physico-mechanical properties of meso-scale ingredients and fabrics, including aggregates, mortar and their interfaces. This paper presents a literature review on the state-of-the-art concrete meso-scale mechanics, emphasizing the development progress on experimental investigation on meso-scale ingredients, pre-processing modeling approaches, and numerical modeling methods for concrete. An in-depth review is also presented on selected aspects on the forefront of the meso-scale concrete mechanics, including the fracture failure mechanism, size effect, multi-scale coupling and rate effect. Finally, some recommendations for future studies are provided.