钢筋锈蚀对钢筋混凝土圆柱抗震性能的影响

Influences of Rebar Corrosion on Seismic Behavior of Circular RC Columns

对不同锈蚀程度的钢筋混凝土圆柱进行了低周反复试验,研究了不同轴压比下钢筋锈蚀率对钢筋混凝土圆柱承载力、刚度、延性、耗能能力等的影响,并给出了试件的滞回曲线和骨架曲线。试验结果表明:随着钢筋锈蚀率和轴压比的增大,滞回环的面积逐渐减小,试件的刚度、延性和耗能能力逐步降低;当遭受严重腐蚀时,试件可能由塑性破坏转变为脆性破坏。

A cyclic horizontal loading test was carried out using circular RC columns damaged by different degrees of rebar corrosion. In the experiment, the seismic behaviors of circular corroded RC columns under different degrees of axial loads, such as bearing capacity, stiffness, ductility and dissipated energy capacity were studied, and the hysteretic and skeleton curves for the circular corroded RC columns were obtained. Test results show that the stiffness, ductility and energy dissipation capacity, as well as areas of hysteresis loops of circle corroded RC columns can be significantly reduced along with the increase of rebar corrosion extent and degrees of axial load. If the circular RC columns contain extremely corroded rebars, the column damaged by plastic failure will be prone to brittle shear failure under seismic loads.