粘结层性能对预应力CFRP布加固RC梁疲劳性能的影响  

Effect of Bonded Interface Properties on the Fatigue Performance of RC Beams Strengthened with Prestressed CFRP Sheets

作　　者：艾军[1] 陆耀清[2] 王侠伟 单岗 蔡晨宁[1] 徐春林[1] 

机构地区：[1]南京航空航天大学土木工程系,210016 [2]江苏省交通科学研究院股份有限公司,南京210017 [3]浙江顺畅高等级公路养护有限公司,杭州310051

出　　处：《特种结构》2012年第1期91-96,共6页Special Structures

基　　金：浙江省交通厅科研项目(编号2008H01)

摘　　要：目前,对预应力CFRP布加固损伤梁疲劳性能的研究很少。本试验完善了预应力CFRP布张拉锚固装置,并设计了一套杠杆型疲劳试验加载体系。进行1根预应力硬粘结加固梁和1根预应力软粘结加固梁的疲劳试验,试验结果表明:采用软粘结可以推迟或避免CFRP布剥离破坏的发生。相比于硬粘结层,软粘结层良好的韧性可以在裂缝附近的粘结界面提供更大的剪切变形能力,能有效改善裂缝出现后CFRP布的受力环境,并且使梁的变形能力得到明显的提高。同时,因软粘结的"时滞"特点,在疲劳循环荷载作用下,软粘结层对改善加固梁的刚度特征能发挥有利的作用。At present, the research of the fatigue performance of damage beams strengthened with prestressed CFRP sheets is relatively less in the world. The tension and anchorage device was perfected in the test. According to the lever principle, a new loading system for fatigue experiments has been designed. A strengthened beam in hard interface and another one in soft interface were tested under fatigue load. Results show that, soft interface can delay or prevent the appearance of debonding failure. Comparing with hard interface, the soft interface peoCorms better in ductility, so it can provide greater shear deformation in the bonding interface around the cracks. Therefore, the soft interface can im- prove the tension condition of the CFRP sheets after the cracks appear and increase the deflection capacity of the beams. Meanwhile,for the time-lag effect of the soft interface, it improves the flexural rigidity of the strengthened beams under fatigue load.

关 键 词：疲劳性能 预应力CFRP布 损伤梁 加固 张拉锚固装置 疲劳试验加载体系 软粘结 

分 类 号：TU375.1[建筑科学—结构工程]