疲劳荷载对锈蚀钢筋混凝土梁刚度影响的试验研究

摘要

In order to study the effect of short-term fatigue load on the flexural behavior of corroded reinforced concrete beams, the fatigue and static loading tests on 8 reinforced concrete beams were carried out. The results show that the effect of the short-term fatigue load on the performance of the corroded reinforced concrete beams is distinctly larger than that on the performance of non-corroded beams. Their cracks grow faster, the cracking regions are also more concentrated, and the working ability of the corroded steel bars and concrete are reduced. The plastic deformation capacity of the corroded reinforced concrete beams after fatigue loading is decreased, and the flexural stiffness degenerates. Increasing the strength of concrete can improve the yield load of corroded beams and other mechanical properties to a certain extent. Reducing the decrease of the flexural behaviors of concrete beams caused by steel corrosion can improve the durability performance of concrete beams.%为研究短期疲劳荷载对锈蚀钢筋混凝土梁抗弯性能的影响,对8根钢筋混凝土梁进行了疲劳及静力加载试验研究.结果表明:短期疲劳荷载对锈蚀钢筋混凝土梁性能的影响明显大于未锈蚀梁的,其裂缝发展速度更快,分布区域也更加集中,锈蚀钢筋与混凝土的协同工作能力降低;疲劳加载后的锈蚀钢筋混凝土梁塑性变形能力降低,抗弯刚度退化的幅度更大;提高混凝土强度可以在一定程度上提高锈蚀梁的屈服荷载等力学指标,减少因钢筋锈蚀导致的混凝土梁抗弯性能的下降幅度,有利于提高混凝土梁的耐久性性能.