【摘要】 为了研究用高性能水泥复合砂浆钢筋网(High performance ferrocement laminate,简称HPFL)加固钢筋混凝土梁的疲劳性能,对11根对比梁和加固梁进行了静力和疲劳性能试验。试验结果显示,与未加固梁相比,加固梁的疲劳性能有明显改善,疲劳寿命提高16%~104%。在经过相同的循环次数之后,加固梁跨中挠度减小30%以上,混凝土和钢筋应变有所降低,裂缝宽度和间距也显著减小。没有植剪切销钉的构件发生了加固层与构件混凝土之间的界面剥离破坏,但端部植入一定数量的剪切销钉后就能避免发生这种破坏模式。更多还原

【Abstract】 In order to study the fatigue behavior of RC beams strengthened with high performance ferrocement laminates(HPFL),static and fatigue experiments were conducted on eleven beams with and without HPFL.The results show that compared with the control specimen,the fatigue behavior of strengthened beams was obviously improved and the fatigue life of repaired beams is increased by 16%～104%.After the same number of cycles,the deflections of strengthened beams are decreased by more than 30%.The strains of concrete and steels are reduced to some extent,both the width and space of the cracks diminish greatly.The failure mode of the specimen without shear dowels is debonding between the interface of HPFL and concrete.However,this failure mode can be avoided by planting shear pins at the end of beams.更多还原