Impact of reinforcement corrosion on serviceability and strength of reinforced concrete bridges

影响加拿大公路基础设施钢筋混凝土的主要劣化机制是钢筋的氯化物腐蚀。本研究的主要目的是评估氯化物引起的钢筋腐蚀对钢筋混凝土桥梁的使用能力和强度的影响。这一问题将从三个方面进行研究：(i)在役荷载对氯离子进入混凝土的影响；（ii）钢筋锈蚀对钢筋混凝土梁柱结构性能的影响；(3)动荷载对劣化钢筋混凝土桥梁的影响。这打算通过实验测试和非线性有限元建模来完成。试验方案的目的是研究氯化物进入钢筋和预应力混凝土梁在持续荷载下。该研究的数值部分旨在将材料劣化模型与钢筋混凝土结构构件在单调和动态加载下的非线性有限元模型相结合。这项研究的意义在于提高了对腐蚀对钢筋混凝土桥梁的使用能力和剩余强度的影响的理解，并通过实施使用寿命模型，将这些知识直接应用于对加拿大老化和恶化的基础设施的有效管理。

The main degradation mechanism that affects reinforced concrete highway infrastructure in Canada is chloride-induced corrosion of the reinforcing steel. The primary goal of this research is to evaluate the impact of chloride-induced reinforcement corrosion on the serviceability and strength of reinforced concrete bridges. Three aspects of this problem are to be investigated: (i) the impact of in-service loads on the chloride ingress into concrete; (ii) the impact of reinforcement corrosion on the structural behaviour of reinforced concrete beams and columns; and, (iii) the impact of dynamic load on deteriorated reinforced concrete bridges. This is intended to be done through both experimental tests and non-linear finite element modelling. The experimental program has as its aim to study chloride ingress into reinforced and prestressed concrete beams under sustained loading. The numerical component of the research aims at integrating material deterioration models with non-linear finite element modelling of reinforced concrete structural members under monotonic and dynamic loading regimes. The significance of this research is the improved understanding of the effects of corrosion on serviceability and residual strength of reinforced concrete bridges, and the direct application of this knowledge to the effective management of Canada's aging and deteriorating infrastructure through the implementation of service life models.