Fracture Mechanics Applied to Concrete

本研究将继续并完成混凝土断裂力学实验研究的创新。迄今为止的研究表明，在不同的加载模式下（在模式I和II加载下），混凝土可以建立一致的非线性断裂力学概念。这一继续研究的主要目的是验证这些预测方法在混凝土中离散裂缝的增长。这项研究将包括分析和实验两部分。实验部分将包括使用模式I和模式II加载的断裂过程区域控制研究，以及混凝土梁的弯曲和对角拉伸测试裂缝扩展研究。将进行数值分析研究以验证实验结果。使用ASTM 561-81中包含的公式获得的Kr值将使用过程区模型重新评估。最终的数值模型将包括骨料互锁和法向应力与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.