| 碳纤维布加固钢筋砼吊车梁抗弯疲劳性能试验 |
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| 引用本文： | 石启印,李爱群,惠卓.碳纤维布加固钢筋砼吊车梁抗弯疲劳性能试验[J].东南大学学报,2007,23(4):561-565. |
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| 作者姓名： | 石启印 李爱群 惠卓 |
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| 作者单位： | 江苏大学土木工程系 镇江212013(石启印)，东南大学混凝土及预应力混凝土结构教育部重点实验室 南京210096(李爱群，惠卓) |
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| 基金项目： | The Natural Science Foundation of Jiangsu Province(NoBK2004064)，the Postdoctoral Foundation of Jiangsu Province(No0701008B) |
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| 摘 要： | 为研究碳纤维布(CFRP)对加固后钢筋混凝土梁的抗弯疲劳性能的影响,进行了3根CFRP加固梁及1根对比梁的抗弯疲劳试验.研究了碳纤维布加固方式、构件使用荷载等参数对碳纤维布加固损伤钢筋混凝土吊车梁的抗弯疲劳性能影响.试验研究表明:采用碳纤维布加固后,构件裂缝的宽度减小50.2%~66%,发展速度也得到控制,钢筋应力减小24.1%~28.2%,构件的刚度提高14.9%~16.1%.依据试验结果,从现有规范中关于构件刚度计算方法出发,进行了CFRP加固钢筋混凝土吊车梁的疲劳刚度计算分析,该计算方法可用于吊车梁加固工程设计.最后给出了CFRP加固梁的疲劳设计的合理化建议.
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| 关 键 词： | 钢筋混凝土吊车梁 结构加固 疲劳试验 碳纤维布 |
| 收稿时间： | 2007-04-05 |
| 修稿时间： | 2007年4月5日 |
Fatigue behavior of crane beam strengthened with CFRP |
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| Shi Qiyin,Li Aiqun,Hui Zhuo.Fatigue behavior of crane beam strengthened with CFRP[J].Journal of Southeast University(English Edition),2007,23(4):561-565. |
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| Authors: | Shi Qiyin Li Aiqun Hui Zhuo |
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| Institution: | 1 Department of Civil Engineering, Jiangsu University, Zhenjiang 212013, China;2Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | In order to study the fatigue behavior of the damaged reinforced concrete (RC) beams strengthened by carbon fiber reinforced polymer (CFRP) laminate,three T-shaped beams strengthened by CFRP and one contrasting beam are tested under fatigue loading,with the parameters of different modes of strengthening and different fatigue load levels considered.The main results obtained from the tests are:the width of the crack decreases 50.2% to 66%,and the development of the crack is limited;the stress of steel decreases 24.1% to 28.2%,and the stiffness increases 14.9% to 16.1% after being strengthened.Based on the technical specification for strengthening concrete structures with CFRP and the conclusions from the tests,a calculating scheme of the flexure stiffness is given,which can be used for reference in engineering design.Finally,some suggestions are given for design in fatigue strengthening. |
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| Keywords: | RC crane beam structure strengthening fatigue test carbon fiber reinforced polymer (CFRP) |
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