A stochastic damage model previously proposed by the author and Li for concrete under monotonic and cyclic loadings is extended to 3D stress states. Specifically, a novel expression form of damage energy release rate, which is the damage driving force thermodynamically, is initiated, and some basic concepts related to concrete damage evolution are further demonstrated. Careful validation of the model against existing experiments reveals that the model is able to well capture the rate effect of concrete and to realistically simulate the monotonic strength, cyclic life, and their accompanying randomness for a wide range of stress states from uniaxial tension to confined compression.

作者和 Li 先前提出的混凝土在单调和循环载荷下的随机损伤模型被扩展到 3D 应力状态。具体而言，首创了热力学上损伤驱动力损伤能量释放率的新表达形式，进一步论证了与具体损伤演化相关的一些基本概念。根据现有实验仔细验证该模型表明，该模型能够很好地捕捉混凝土的速率效应，并真实地模拟从单轴拉伸到受限压缩的各种应力状态下的单调强度、循环寿命及其伴随的随机性.