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混凝土是典型的准脆性复合材料,其物理及力学性质取决于两种主要组成材料,即粗骨料和硬化水泥砂浆以及两者间的粘结作用。简言之,需要从其微/细观角度来把握混凝土材料的宏观物理及力学性质。本文阐述和讨论了细观尺度分析方法在混凝土静、动态力学性能及破坏机制,混凝土材料及钢筋混凝土构件层次的尺寸效应,以及氯盐环境下混凝土应力腐蚀行为(包括:氯离子传输行为及钢筋锈胀引发的保护层断裂破坏行为)数值研究方面的应用进展。最后对其未来发展的一些方向和有待进一步研究的问题作了总结。
Concrete is a typical quasi-brittle composite material whose physical and mechanical properties depend on two major constituent materials, namely coarse aggregate and hardened cement mortar and the bonding between the two. In short, it is necessary to understand the macroscopic physical and mechanical properties of concrete materials from their micro/micro perspectives. This paper describes and discusses the mesoscale analysis methods in concrete static and dynamic mechanical properties and failure mechanisms, size effects of concrete materials and reinforced concrete member levels, and the stress corrosion behavior of concrete under chloride salt conditions (including: chloride ion transport behavior and reinforcement The corrosion failure of the protective layer caused by corrugation.) Progress in the application of numerical studies. Finally, some directions for future development and issues to be further studied are summarized.