Fracture Mechanics Applied to Concrete

这项研究将继续并完成混凝土断裂力学的创新性实验研究。到目前为止的研究表明，对于不同的加载模式(在模式I和模式II下)，可以为混凝土发展一致的非线性断裂力学概念。这项后续研究的主要目标是验证这些混凝土中离散裂缝扩展的预测方法。这项研究将包括分析和实验两部分。实验部分将包括使用I型和II型加载的断裂过程区控制研究，以及关于裂缝扩展的弯曲和对角拉伸试验的混凝土梁研究。为了验证实验结果，将进行数值分析研究。使用ASTM 561-81中包含的公式获得的Kr值将使用工艺区模型进行重新评估。最终的数值模型将包括骨料互锁以及法向和剪应力相互作用的影响。

This research will continue and complete the innovative experimental fracture mechanics research in concrete. The investigations to date have shown that consistent non-linear fracture mechanics concepts can be developed for concrete for differents modes of loading, (under Mode I and II loadings). The major objective of this continuation research is to verify these predictive methodologies for discrete crack growth in concrete. This research will have analytical and experimental components. The experimental component will involve both fracture process zone control studies using Mode I and Mode II type loadings, and concrete beam studies for flexural and diagonal tension test on crack propagation. Numerical analyses studies will be carried out to verify the experimental results. The Kr values obtained using the formula contained in ASTM 561-81 will be re-evaluated using a process zone model. The final numerical model will include the effects of aggregate interlock and normal and shear stress interactions.