预应力芳纶纤维布加固腐蚀混凝土梁疲劳性能  

Fatigue Performance of Corroded RC Beams Strengthened With Prestressed AFRP Sheets

作　　者：邓宗才[1] 李凯[1] 曾洪超[1] 王力[1] 林合飞[1] 

机构地区：[1]北京工业大学城市与工程防灾减灾省部共建教育部重点实验室,北京100124

出　　处：《北京工业大学学报》2009年第7期921-927,共7页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(50678011);北京市自然科学基金资助项目(8082002)

摘　　要：对带永久锚具的预应力芳纶纤维(AFRP)布加固锈蚀钢筋混凝土梁的疲劳性能进行了试验与研究.通过疲劳试验,探讨了预应力水平和钢筋锈蚀程度(中度6%、重度12%)对加固梁疲劳破坏机制、疲劳寿命、挠度和应变发展等疲劳特性的影响.试验结果表明:预应力AFRP布与非预应力AFRP布加固梁的疲劳破坏机制相同,都为钢筋的疲劳断裂;预应力AFRP布加固锈蚀钢筋混凝土梁的抗疲劳特性明显优于非预应力AFRP布加固梁,且AFRP布预应力水平越高,加固梁的疲劳寿命越高;锈蚀率越高,梁的疲劳寿命越低,重度锈蚀梁的疲劳性能的降低幅度比中度锈蚀梁更明显;钢筋锈蚀率的增加会导致钢筋的等效疲劳切口系数增大,从而导致锈蚀梁疲劳寿命的显著降低.A primary study on fatigue behaviors of strengthening corroded RC beams using prestressed aramid fiber reinforced polymer(AFRP) sheets with permanent anchor was carried out.The objective is to examine the effects of AFRP composite rehabilitation systems on the fatigue performance of corroded RC beams.Based on the fatigue experimental results,the effects of different pre-stress level of AFRP sheets under different ratio of corrosion(moderate corroded: reinforcement mass loss is 6.0%,severe corroded: reinforc...

关 键 词：锈蚀 预应力 芳纶纤维布 混凝土梁 疲劳 

分 类 号：TU375.1[建筑科学—结构工程]