CFRP板侧面与底面嵌贴加固梁对比试验研究

EXPERIMENTAL STUDY ON THE REINFORCEMENT OF THE SIDE AND BOTTOM OF CFRP PLATE

对侧贴和底贴CFRP板嵌入式加固钢筋混凝土梁进行抗弯性能试验研究,比较了多个对照组在相同加固量下侧贴梁和底贴梁对试件承载力、跨中挠度及裂缝发展情况的影响,对比分析了侧贴和底贴的加固效果。试验结果表明:两种加固方式均能显著提高加固梁的承载力和刚度,而对于屈服荷载、极限荷载和裂缝发展而言,侧面嵌贴加固在各方面都很接近底面嵌贴加固的加固效果,虽然在承载力上略有不如,但差距很小,而且施工便捷性、适用性和耐久性更好,可以在很多条件下替代底面嵌贴加固。

Fiber composite materials are widely used in the field of building structural reinforcement. The traditional CFRP reinforcement method is usually externally sticking CFRP,which is prone to peeling damage,easy to wear and corrosion,etc.,and the embedded reinforcement method can well avoid the external decoration method.The embedded CFRP reinforcement method mainly has two kinds of reinforcement methods,one is to slot the bottom surface and the other is to be grooved on the side for reinforcement. In this paper,the flexural behavior of the reinforced concrete beams embedded with CFRP panels and the bottom-mounted and bottom-mounted CFRP panels were tested. The bearing capacity and mid-span deflection of the specimens were compared between the two panels in the same reinforcement. The effect of crack development and comparative analysis of the side and bottom reinforcement were investigated. The test results show that both kinds of reinforcement methods can significantly improve the bearing capacity and rigidity of the reinforced beam. And,for the yield load,ultimate load and crack development,the side splicing reinforcement is close to the reinforcement effect of the bottom splicing reinforcement in all aspects. Although the bearing capacity is slightly inferior,the gap is small,the construction convenience,applicability and durability are better,and the bottom panel can be replaced under many conditions.