基于不同加固方式的RC梁加固性能试验对比研究

Experimental comparative study on performance of RC beams subjected to different strengthening methods

交通建设快速发展的同时,随着桥梁服役时长增加和各种内外在因素的综合作用,大量的桥梁面临加固改造.基于RC梁的截面受力特点,难以避免的截面开裂往往导致结构刚度和承载力下降,并使其耐久性恶化.粘贴板材是RC梁工程加固最常用的加固方式,不同板材所起的加固效果亟待深入研究.研究开展了8根RC梁粘贴板材加固试验,分别为裸梁、粘贴碳纤维布、碳纤维板和钢板,采用两点加载至构件破坏.基此分析不同加固方式下RC梁的应变特点、变形性能、极限强度和破坏模态等受力性能,综合比较不同加固方式的加固效果.研究表明:在防腐措施得以保证的前提下,RC梁粘贴板材的加固效果依次为碳纤维布劣于碳纤维板劣于钢板.

A large number of bridges need reinforcement and reconstruction because of various internal and external factors and service for long time when transportation construction develop rapidly. Based on loading features of RC beams, the section cracking is difficult to avoid and will case the degradation of stiffness, capacity and durability. Laminate strengthening is the most commonly used method of strengthening, the strengthening effect cased by different plate pending further study. 8 RC beams experiment are nude beam, beam with carbon fiber cloth, carbon fiber plate and steel plate respectively. Using two-point loading until member broken.Base on the results analysising the strain features, deformation performance, ultimate strength, failure model and so on. The results show that the strengthening effect of steel plate is the best ,and then carbon fiber plate, and then carbon fiber cloth on the premise of anticorrosion.