动荷载下锈蚀钢筋与混凝土粘结性能研究

The bond strength and bond stress-slip relationship between corroded reinforcements and concrete play a crucial role in bearing capacity determination and nonlinear analysis of existing reinforced concrete structures under dynamic loading. Through experimental and theoretical ways, the bond behavior of corroded reinforcements under different loading rates will be investigated in this study. By means of the pull-out test and digital image technique, the whole bond failure process will be analyzed. Based on the stress state of concrete nearby the transverse rib and the strength failure criterion of concrete, the crack propagation will be analyzed. Finally, the bond strength model and bond stress-slip model between corroded reinforcement and concrete under different loading rates will be proposed. The research of this program will set a guideline for the prediction of bearing capacity and residual life of existing reinforced concrete structures after earthquake.

动荷载下锈蚀钢筋与混凝土间的粘结强度和粘结滑移本构关系是既有钢筋混凝土结构承载力计算和非线性分析的重要条件。本项目拟采用试验和理论分析相结合的方法，对动荷载下锈蚀钢筋与混凝土的粘结性能进行研究。通过开展中心拉拔试验并结合数字图像技术对锈蚀变形钢筋与混凝土间的粘结破坏过程进行分析，结合横肋间混凝土的应力状态及混凝土强度破坏准则，分析混凝土内部裂缝的扩展规律，从而构建考虑加载速率与钢筋锈蚀共同作用下的粘结强度计算模型及粘结滑移本构关系。项目研究成果将对震后既有钢筋混凝土结构安全性评估具有重要意义。

动荷载下钢筋与混凝土间的粘结强度和粘结滑移本构关系是既有钢筋混凝土结构承载力计算和非线性分析的重要条件。本项目采用试验和理论分析相结合的方法，对动荷载下锈蚀钢筋与混凝土的粘结性能进行研究。通过开展中心拉拔试验并结合数字图像技术对变形钢筋与混凝土间的粘结破坏过程进行分析，结合横肋间混凝土的应力状态及混凝土强度破坏准则，分析混凝土内部裂缝的扩展规律，构建了粘结强度计算模型及粘结滑移本构模型。项目研究成果将对震后既有钢筋混凝土结构安全性评估具有重要意义。