通过4根梁试件的静力加载试验,对内嵌cFRP筋加固混凝土梁的受力过程、开裂荷载、屈服荷载、极限荷载、裂缝和变形情况等进行了较为系统的研究.结果表明,内嵌CFRP筋加固混凝土梁没有发生剥离破坏,且能够显著提高被加固梁的极限荷载,随加固量增加,提高幅度越大,最大可提高81.89%,而对开裂荷载、屈服荷载影响较小;加固梁裂缝间距较小,数量较多,梁破坏时最大裂缝宽度小,梁的挠度变形也相对较小.内嵌式加固方法快捷简单、不影响结构的正常使用,是一种值得推广的新技术.
This paper presents research on four beams strengthened with CFRP bonded in sawed grooves in the concrete cover under monotonous loads. The first-crack load, steel-yielding load, ultimate load at failure and deformation are systematically studied. Test results indicate that the strengthening method could overcome the problems with peeling of the strengthening material when surface bonded FRP laminates, and exhibites higher ultimate load compard with nonstrengthened beams, which shows that the ultimate load could be increased by 81.89%, and the space between cracks is smaller, the number of cracks is more, the width of cracks is smaller, as well as the deformation capacity is larger, but it shows no effect on cracking load and yield load. The construction of the method is simple. So, this new strengthened method is an efficient method.
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