| Behavior of preloaded RC beams strengthened with CFRP laminates |
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| 作者姓名： | 张爱晖 金伟良 李贵炳 |
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| 作者单位： | Department of Civil Engineering Zhejiang University Hangzhou 310027 China，Department of Civil Engineering Zhejiang University Hangzhou 310027 China，Department of Civil Engineering Zhejiang University Hangzhou 310027 China |
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| 基金项目： | Project (No. 03HK03) supported by the Science and Technology Development Foundation for College and University of Shanghai, China |
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| 摘 要： | INTRODUCTION Externally bonded fiber reinforced polymer (FRP) composites can be used to improve the flexural strength of structural members. To evaluate the flex-ural performance of the strengthened members, it is necessary to study the flexural stiffness of FRP- strengthened RC members at different stages, such as pre-cracking, post-cracking and post-yielding. Up to now, only very few studies were focused on the structural members strengthened under pre-loading or pre-cracking (Arduin…
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| 关 键 词： | 钢筋混凝土柱 曲线形为 预加负荷 碳纤维强化塑料 加固 |
| 收稿时间： | 2005-05-20 |
| 修稿时间： | 2005-11-11 |
Behavior of preloaded RC beams strengthened with CFRP laminates |
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| Ai-hui Zhang,Wei-liang Jin,Gui-bing Li.Behavior of preloaded RC beams strengthened with CFRP laminates[J].Journal of Zhejiang University Science,2006,7(3):436-444. |
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| Authors: | Ai-hui Zhang Wei-liang Jin Gui-bing Li |
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| Institution: | (1) Department of Civil Engineering, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | Eighteen reinforced concrete beams, including 16 beams strengthened with CFRP laminate at different levels of preload and 2 control beams, were tested to investigate the influence of preload level on flexural behavior of CFRP-strengthened RC beam. The experimental parameters include rebar ratios, number of plies of CFRP laminates and preload level at the time of strengthening. Theoretical analysis was also carried out to explain the experimental phenomena and results. The experimental and theoretical results indicated that the preload level has more influence on the stiffness and deflection of the strengthened beam, both at post-cracking and post-yielding stage, than that on the yielding and ultimate flexural strength of the strengthened beam. The main failure mode of CFRP-strengthened beam is the intermediate crack-induced debonding of CFRP laminates, provided that the development length of CFRP laminates and shear capacity of the beam are sufficient. |
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| Keywords: | Beam Strengthen CFRP Flexural behavior Preload level |
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