碳纤维布加固钢筋混凝土梁徐变后的疲劳性能研究  

Fatigue behavior of reinforced concrete beams strengthened with carbon fiber sheets after creep

作　　者：方志[1] 龚畅[1] 杨剑[2] 曹国辉[3] 唐铅雄[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中南大学土木建筑学院,湖南长沙410075 [3]湖南城市学院土木工程系,湖南益阳413000

出　　处：《铁道科学与工程学报》2011年第1期6-13,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(50478502)

摘　　要：粘贴碳纤维布加固混凝土梁粘贴界面的长期性能,特别是承受长期荷载后的抗疲劳性能是这种加固方法能否推广应用的关键问题,基于此对碳纤维布加固钢筋混凝土梁徐变后的疲劳性能进行了试验研究。研究结果表明：粘贴碳纤维布的钢筋混凝土梁具有良好的疲劳性能,经过相同次数的疲劳荷载后,没有经历徐变过程的加固梁与未加固梁相比,前者的挠度比后者减少9%~18%;经历了徐变过程的加固梁与未加固梁相比,前者的挠度比后者减少5%~13%。在综合考虑疲劳残余应变、疲劳弹性模量退化及疲劳强度退化等的基础上,提出了简化的疲劳全过程分析方法,计算值与实测值变化规律基本吻合。The long-term behavior of bonding surface of concrete beams reinforced with carbon fiber sheets,especially,the fatigue behavior under long-term load is the key factor for its successful use.The experimental investigation was conducted about the fatigue behavior of reinforced concrete beams strengthened with carbon fiber sheets after creep.It is shown that the reinforced concrete beams strengthened with carbon fiber sheets have better fatigue behavior.The deflection of strengthened beams which had not crept reduce 9%~18% to that of beams which had not crept.The deflection of strengthened beams which had crept reduce 9%~18% to that of beams which had crept.The full analysis of fatigue is presented based on the residual strain,fatigue elastic and fatigue strength degradation,and the calculating results are accordant to observed data.

关 键 词：碳纤维复合材料CFRP(Carbon Fiber REINFORCED Plastics) 加固 梁 疲劳 

分 类 号：TU377[建筑科学—结构工程]