荷载与环境的耦合作用对混凝土梁腐蚀疲劳的影响

EFFECT OF INTERACTION BETWEEN LOADING AND ENVIRONMENT ON CORROSION FATIGUE OF REINFORCED CONCRETE BEAM

主要研究了循环荷载与腐蚀环境的耦合作用对混凝土梁腐蚀疲劳的影响,根据试验测试的钢筋应变数据可以看出,腐蚀和疲劳的共同作用加速了钢筋应变的发展。疲劳或腐蚀的单一影响,以及腐蚀后疲劳致使构件劣化的程度,不及腐蚀疲劳作用造成的劣化结果严重,这种共同作用加速劣化进程。从应变发展的连续性来看,耦合作用是连续的,伴随试验构件直至破坏的全过程。研究表明,腐蚀疲劳是使钢筋混凝土构件过早丧失耐久性能的重要原因,研究成果可为构件的耐久性设计和防止在役构件劣化的工程技术措施提供参考。

The effect of interaction between cycle loading and aggressive environment on Corrosion fatigue of reinforced concrete beams was studied. The strain increase of the reinforcing bars was accelerated under simultaneous corrosion and fatigue loading from the experimental results. The effect of coupling action of corrosion fatigue was more serious than that of fatigue or corrosion and fatigue after corrosion on the deterioration of RC members. The coupling action was continuous with the strain increase until the RC members were destructed. The investigation shows that the corrosion fatigue is the main cause for the reinforced concrete beams to lose the durability. The experimental results may provide the reference for the durability design of reinforced concrete members and the protection measures of RC members in service.