摘要
预应力碳纤维片材加固混凝土结构是碳纤维加固的重要研究方向,国内外学者已经进行大量研究,但目前关于预应力碳纤维片材加固受弯构件的疲劳性能的试验研究很少,对加固构件疲劳破坏机理也存在认识分歧。针对已有疲劳试验研究的不足,进行7根大比例T形试件的试验研究,比较分析不同加固方式产生的构件疲劳性能差异,初步研究黏结树脂疲劳强度以及碳纤维板剥离对构件疲劳寿命的影响。试验结果表明:与非预应力碳纤维板加固相比,预应力碳纤维板加固显著降低钢筋应力,提高构件的疲劳性能;非预应力碳纤维板加固构件在钢筋疲劳断裂之前树脂先产生黏结疲劳破坏从而引起碳纤维板剥离;黏结剥离致使钢筋承担应力增大,从而减少构件的疲劳寿命。
Studies have been widely conducted for strengthening fiber reinforced polymer （CFRP） laminates. However, study strengthened with prestressed CFRP laminates is limited and there reinforced concrete structures using prestressed carbon on the fatigue behavior of reinforced concrete beams exist disagreement on the fatigue damage mechanism of strengthened members. Seven large scale T-beams prestressed by different CFRP strengthening methods were tested under cyclic loading and the fatigue performance of the beams was comparatively analyzed. The effects of the fatigue strength of epoxy resin and the debonding of CFRP plate on the fatigue life of specimens were investigated. The test results indicate that, compared with the strengthened beams with no-prestressing CFRP plates, the stress of steel reinforcement in the CFRP prestressed beams decreased significantly and the fatigue behavior of the strengthened beams improved. The fatigue failure of the resin may occur before fatigue fracture of the steel reinforcement, which may lead to debonding of CFRP plates. The stress in steel reinforcement increases and the fatigue life of members decreases with the debonding of the CFRP plates.
出处
《土木工程学报》
EI
CSCD
北大核心
2009年第8期42-49,共8页
China Civil Engineering Journal
基金
湖南省交通科技项目(200412)
