混凝土时间相关断裂模型研究综述

混凝土结构在强震作用下的完整性以及带缝服役的稳定性关系到重大国家安全战略.这两个问题本质都涉及混凝土的时间相关断裂行为.混凝土材料时域相关的断裂行为可以笼统地概括为两个方面,即短时间在动态冲击荷载下的冲击断裂破坏和长时间稳态的蠕变断裂破坏.虽然两者都与时间存在关系,但是荷载作用时间却存在巨大的差异,这导致了混凝土动态破...

Review of time-dependent fracture model of concrete

The integrity of concrete structures under strong earthquakes and the stability of concrete structures with cracks are concerns of national security strategies.These two issues are closely related to the time-dependent fracture behavior of concrete.The time-domain dependent fracture behavior of concrete can be generalized into two aspects: short-term impact fracture under dynamic impact load and long-term steady-state creep fracture failure.Although they both are related to time, there is a huge difference in the loading time, which leads to the different internal mechanism of dynamic failure in concrete.Herein, the development history and main achievements of time-dependent fracture model of concrete are reviewed, including macroscopic fracture mechanics model and method, mesoscopic fracture mechanics model and method, dynamic fracture, and creep fracture behavior of concrete.