荷载与锈蚀共同作用下钢筋混凝土梁抗弯试验研究

Study on flexural experiment of reinforced concrete beams under simultaneous service loading and corrosion

通过对持续荷载作用下锈蚀梁、加载后卸载锈蚀梁、持续加载不锈蚀梁和参考梁的对比试验,研究不同荷载作用对钢筋混凝土梁中钢筋锈蚀及梁变形性能和剩余承载力的影响。在整个锈蚀试验过程中施加持续荷载,通过对钢筋施加外加电流和交替喷洒盐水加速钢筋锈蚀,达到预定的时间后进行剩余承载力试验。结果表明,荷载对钢筋锈蚀有明显影响,荷载作用使梁锈蚀加速,钢筋产生不均匀锈蚀,梁的挠度增大,破坏形态发生改变,剩余承载力降低。

The effects of different loading on the corrosion of reinforcing steel, the deflection and remaining loading capacity of the reinforced concrete beams are studied. The beam specimens are subjected to bending at various loading levels or sustained loading or previous loading while the steel bar is of corrosion and other beam is with sustained loading or without loading or without corrosion of steel bars. The application of an external current and the NaCl solution spraying is used to accelerate the corrosion of the steel bars. The remaining flexural loading capacity of the beams is tested at the end of the experiment. The results show that the loading has a visible effect on corrosion. The corrosion of reinforcing steel bars is accelerated and un-uniform under simultaneous loading. The time-dependent deflection of the beams increases and the residual flexural load-bearing capacity decreases.