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采用实验室模拟钢筋混凝土桥梁的实际工作状态,首先对4个钢筋混凝土(RC)梁试件施加幅值分别为0,4Pu,0.5Pu,0.6Pu(Pu为单调加载梁的极限荷载)的循环荷载且等幅循环加载10次,再对损伤的RC梁进行240次海水干湿循环作用,最后进行单调加载试验,研究RC梁的力学性能劣化情况。结果表明:在循环荷载和海水干湿循环综合作用下,随着循环荷载幅度增加,钢筋混凝土梁的屈服荷载、极限荷载、刚度等力学指标均下降;240次海水干湿循环作用后,循环荷载产生的梁试件中混凝土裂缝大多数自愈合,少数裂缝呈现部分愈合状态。
Using the laboratory simulation of the actual working condition of the RC bridge, four cycles of RC beams were respectively applied with 0, 4Pu, 0.5Pu and 0.6Pu (Pu is the ultimate load of the monotonic loading beam) The load was loaded 10 times in equal amplitude cycles, and then 240 cycles of seawater wet-dry circulation were performed on the damaged RC beams. Finally, the monotonic loading test was conducted to study the mechanical properties deterioration of the RC beams. The results show that with the increase of cyclic load, the mechanical properties such as yield load, ultimate load and stiffness of RC beams decrease with the combined effect of cyclic loading and seawater wet-dry cycle. After 240 cycles of wet-dry circulation, the cyclic loading Most of the concrete cracks in the beam specimens self-healed, and a few cracks showed partial healing.