【摘要】 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。更多还原

【Abstract】 Simulating the working state of reinforced concrete bridge structures,reinforced concrete(RC) beams specimens were cyclically loaded with different load amplitude of 0,0.4Pu,0.5Puand 0.6Pu(Puwas the ultimate load of monotonic load),separately,and each load level was cycling for 10 times.Then the damaged RC beam specimens underwent 240 times of seawater wet-dry cycle.At last the beam specimens were tested to study mechanical property deterioration of RC beams.The results showed that the mechanical property of RC beams specimens,such as yield load,ultimate load and stiffness,were reduced as cyclic loading amplitude increased.In addition,under synthetic actions of cyclic loading damage and seawater wet-dry cycles,the most cracks of concrete beams specimens,due to the cycle load,were self-healed,some of them were partially healed.更多还原