复合纤维抗弯加固混凝土外伸梁试验研究

通过对T形截面外伸梁复合纤维抗弯加固的静力试验 ,分析了持荷加固和损坏加固对复合纤维抗弯加固钢筋混凝土梁强度、刚度及挠度的影响 ,探讨了外伸端支座区域复合纤维与混凝土之间粘结应力的分布规律 ,研究了不同加固方式对抗弯加固效果的作用 .试验结果表明 :复合纤维加固钢筋混凝土梁能有效提高梁的极限承载力 ;加固量较多时能提高梁的第二刚度 ;当发生剥离破坏时 ,持荷加固对梁的极限承载力影响不大 ;损坏后加固和不损坏加固极限承载力相近 ;不同加固方式对极限承载力和刚度有很大影响 ;负弯矩区复合纤维延伸长度很短

Experimental Study on Reinforced Concrete Extended Beam Strengthened with Composite Fiber Reinforced Polymer

The intent of this study is to investigate experimentally the behavior of extended RC beam of T section strengthened with composite fiber reinforced polymer (FRP).The effects of the beam wrapped with FRP in both sustained and damaged conditions in strength,stiffness and deflection were analyzed.The distribution of the bond strain between FRP and the concrete adjacent to the support of the extending end was also measured.In addition,the reasons that different strengthening methods result in different effects are discussed.Based on the experimental results,the following conclusions are drawn:Increase in ultimate strength by wrapping RC beam is obtained.The stiffness can also be improved when the FRP quantities are properly enough.The experiments show that the properties when strengthened in postcracking stage is similiar to those when strengthened in precracking stage if the failure occurs in bond peel.Damaged beams rehabilitated with FRP wrappings exhibited ultimate strength similiar to undamaged wrapped beams,but stiffness reduces somewhat.The different strengthening patterns have significant effects on ultimate capacity and stiffness.The development length of fiber is short.