悬臂梁支座附近表层嵌入FRP筋后性能研究

BEHAVIOR OF SUPPORT ZONE OF CANTILEVER BEAM EMBEDED WITH FRP TENDONS

对悬臂梁支座附近受弯面和侧面表层嵌入FRP筋材后的性能开展了试验研究，探讨了FRP筋类型、试验梁侧面开槽嵌粘方式和初始荷载对悬臂梁性能影响，分析了试验梁的特征荷载、悬臂端挠度、钢筋和FRP筋材的应变。试验结果显示，内嵌FRP筋能够提高悬臂梁的开裂荷载、屈服荷载和极限荷载，试验梁的极限荷载提高范围为48．9％～64．2％；内嵌FRP筋有效地抑制悬臂端挠度，控制了悬臂梁的变形，持续荷载作用下试验梁加固后特征荷载要比其它无初载作用的加固试验梁略低，变形略大，不过，加固效果仍很明显。由此可见，悬臂梁采用FRP筋嵌粘是一种有效的加固方法。

The properties of a cantilever beam embedded FRP tendons at the curved surface and lateral surface was carried out near the support. Impacts of a FRP bar type, the side slotting and embedded sticky mode of the test beams and initial loading on the cantilever beam were discussed. The characteristic loading of the test beams, the deflection of the cantilever end and the strain of steel/FRP tendons were analyzed. The experimental results show that the crack load, yield load and ultimate load of the cantilever beam can be enhanced by embeded FRP tendons. The ultimate load of the test beams increases by 48.9% - 64.2%. Deflection of the cantilever end and deformation of the cantilever beam can be effectively controlled by embeded FRP tendons. The characteristic loads of the strengthened beam under sustained loading are lower than that of the beams without initial loading, and the deformation is larger. Thus, it is an effective reinforced method by embeded FRP tendons in the cantilever beam near the support.