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中文摘要：
采用人工气候加速腐蚀方法,对8个剪跨比为2.67的RC框架梁进行拟静力试验,研究不同锈胀裂缝宽度下,箍筋与纵筋锈蚀的弯剪破坏RC框架梁的抗震性能衰减规律。首先,保持框架梁设计参数不变,仅变化钢筋锈蚀程度,其次,保持锈蚀程度不变,仅改塑性铰区箍筋间距,以延性系数、承载力、塑性转角、变形恢复能力、刚度退化和累积滞回耗能等指标为参数,给出了不同锈蚀程度、不同配箍率下RC框架梁的抗震性能退化规律：锈蚀程度相同时,随配箍率的减小,锈蚀框架梁对筋锈蚀程度更加敏感;由于箍筋纵筋均锈蚀,构件抗弯、抗剪承载力均下降,表现为构件极限荷载的降低和屈服平台的变短;以延性系数、软化刚度退化和累积耗能等参数对锈蚀率最为敏感;随锈蚀率增大,破坏模型主要由弯曲破坏为主的弯剪破坏模式转变为延性差、剪切变形明显的脆性破坏模式。
英文摘要：
8 RC frame beams with shear span ratio as 2. 67 were tested in artificial climate until the deigned corrosion crack widths were reached for the specimens,and then the quasi-static tests were carried out to study the seismic behaviors of corroded RC frame beams with stirrups and longitudinal steel bars failed in flexure-shear action. The 8specimens were divided into two groups. The structural design parameters of the specimens in the first group remained unchanged,but the corrosion crack widths of steel bars were changed. The specimens in the second group were designed with the same corrosion crack width,but the stirrup ratios were changed. Six performance indicators,such as bearing capacity,ductility and plastic rotation,displacement restoring capacity,stiffness degradation and cumulative hysteretic energy dissipation parameters,were used to evaluate the deterioration law of seismic behaviors of RC frame beams with different corrosion crack widths and stirrup ratios. The conclusions were given as follows： corroded RC frame beams with lower stirrup ratio are more sensitive to the corrosion rate. Based on the skeleton curves of RC frame beams,it is seen that both flexural capacity and shear capacity may degrade with the increase of corrosion rate of stirrups and longitudinal bars. It is proved that the indices of ductility coefficient, stiffness degradation and cumulative hysteretic energy dissipation are most sensitive to the corrosion rate. With the increase of corrosion loss ratio,the failure mode would transit from flexure-shear failure to shear failure.
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