论文部分内容阅读
进行了两种不同应力水平下碳纤维布加固钢筋混凝土板的疲劳试验和普通钢筋混凝土板的疲劳对比试验。试验中对构件进行了从开始到疲劳破坏的全程观测,包括了裂缝的出现和发展,混凝土、钢筋和碳纤维应变变化,构件挠度变化等。试验结果表明,碳纤维对改善受弯构件的抗疲劳性能,延长疲劳寿命很有效。其中粘结胶体性能的好坏对能否充分发挥碳纤维布材料优势有很大的影响。基于平截面假定,指出了构件截面在疲劳过程中应力重分布的规律。
The fatigue tests of reinforced concrete slabs strengthened with CFRP at two different stress levels and the fatigue tests of ordinary reinforced concrete slabs were carried out. During the experiment, the entire observation of the components from the beginning to the fatigue failure was carried out, including the appearance and development of cracks, the strain changes of concrete, steel bar and carbon fiber and the deflection of members. The experimental results show that carbon fiber is very effective in improving the fatigue resistance of flexural members and prolonging the fatigue life. Among them, the performance of the adhesive colloid has great influence on whether the advantages of the carbon fiber cloth material can be fully exerted. Based on the assumption of flat section, the law of stress redistribution in the cross-section of the component during fatigue is pointed out.