中文摘要：

针对已有的研究以小尺度的试块实验而未能反映实际混凝土结构在荷载与氯盐耦合作用效应，自行设计大尺度钢筋混凝土梁的持续荷载施加装置，采用“电渗一恒电流一千湿循环”的方法对钢筋混凝土梁进行持续荷载作用下的加速锈蚀实验，并对试验后的混凝土梁的力学性能进行研究；同时，采用RCT方法研究试验梁混凝土保护层厚度范围内的氯离子分布规律，采用半电池电位法及称重法相结合来评价试验梁内纵向受拉钢筋锈蚀程度．结果表明：氯盐与持续荷载耦合作用下，随着持续荷载水平的提高，保护层厚度范围内的氯离子质量分数会增大，会在钢筋附近出现聚集现象；同时，也使纵向钢筋的锈蚀率增大，钢筋截面的锈蚀不均匀程度明显；导致混凝土梁的极限荷载减小，延性降低，截面曲率延性增高．

英文摘要：

In order to hold up the joint effect of chloride attack and loads on the actual reinforced concrete structures, a loading device to be subjected to sustained load was designed and made to be used for the experiment of large-size reinforced concrete beams. Accelerated corrosion experimental way was conducted on reinforced concrete beams by the electro osmosis-constant current-wet and dry cycle （ECWD） under the joint action of chloride attack and sustained loading. The load-deflection curve, ductility and other flexural properties of the specimens were studied by loading test. By use of rapid chloride test （RCT） method, distribution of chloride ion concentration within the concrete protection layer of test beams was measured. The corrosion degree of longitudinal reinforced bars in tensional region was evaluated by the way of half-cell potential measurements and steel weighing method. The experimental results showed that with the increase of sustained load level, the chloride ion concentration within the concrete protection layer was higher, and the chloride ion might be accumulated around longitudinal bars in tensional region. Furthermore, the corrosion degree and its uneven extent of longitudinal bars were greater. Also the flexural properties of the specimens, which included yielding load, ultimate load, displacement ductility, were to some degree degenerated while the curvature ductility factor was bigger. Moreover the greater the loading level was, the higher the degradation level was.