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本文使用大型的矢量计算机模拟混凝土材料在单轴压荷载及拉荷载下的力学行为。本文所介绍的波鸿模型,可以研究混凝土内部直至完全破坏时的裂缝扩展全过程,在此基础上,提出了混凝土材料细观结构模型,以研究骨料和基相间的界面粘结强度对整个混凝土结构力学行为的影响。试验结果表明:微裂缝首先在水泥/骨料界面上引发,随着微裂缝密度的增加在界面上形成了界面裂缝,只是从应力-应变曲线下降段上的某一点开始,裂缝才向基相扩展并相互联结而最终导致了破坏。粘结强度决定了微裂缝引发时的应力水平,但对混凝土强度的影响并不明显。
This paper uses a large vector computer to simulate the mechanical behavior of concrete materials under uniaxial compressive and tensile loads. The Bochum model introduced in this paper can study the whole process of crack propagation inside the concrete up to complete destruction. On this basis, a meso-structure model of the concrete material is proposed to study the interfacial bond strength between the aggregate and the base phase. The influence of mechanical behavior of concrete structures. The test results show that the microcracks are initiated at the cement/aggregate interface first, and the interfacial fractures are formed at the interface with the increase of the microcrack density, but only from a certain point on the descending segment of the stress-strain curve, the cracks are directed to the base phase. Expand and connect with each other and eventually lead to destruction. The bond strength determines the stress level at the initiation of the microcracks, but the effect on the strength of the concrete is not obvious.