[1] Wang Wenwei, Li Guo,. Behavior of interfacial stresses between RC beams and GFRP sheets [J]. Journal of Southeast University (English Edition), 2007, 23 (1): 105-111. [doi:10.3969/j.issn.1003-7985.2007.01.021]
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Behavior of interfacial stresses between RC beams and GFRP sheets(
)
GFRP布与钢筋混凝土梁界面之间应力行为
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 23
- Issue:
- 2007 1
- Page:
- 105-111
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2007-03-30
Info
- Title:
- Behavior of interfacial stresses between RC beams and GFRP sheets
- GFRP布与钢筋混凝土梁界面之间应力行为
- Author(s):
- Wang Wenwei1, Li Guo2
-
1School of Transportation, Southeast University, Nanjing 210096, China
2Chengxian College, Southeast University, Nanjing 210096, China
- Keywords:
- glass fiber reinforced plastic(GFRP); strengthening; reinforced concrete beam; shear stress; normal stress
- PACS:
- TU582.57
- DOI:
- 10.3969/j.issn.1003-7985.2007.01.021
- Abstract:
- Seven reinforced concrete(RC)beams with epoxy-bonded glass fiber reinforced plastic(GFRP)sheets and two control RC beams were experimentally tested to investigate the bond behavior of the interfaces between RC beams and GFRP sheets.The variable parameters considered in test beams are the layers of GFRP sheets, the bond lengths and the reinforcement ratios.The results indicate that the flexural strength of the repaired beams is increased, but the ultimate load of beams with GFRP sheets debonding failure is reduced relatively.The bond length is the main factor that results in bonding failure of the strengthened beams.An experimental method of interfacial shear stress is proposed to analyze the distribution of shear stress according to experimental results.The analytical method of shear and normal stresses and a simple equation are proposed to predict the peeling loads.The proposed model is applied to experimental beams.The analytical results show a good agreement with the experimental results.
- 为了解玻璃纤维(GFRP)布与钢筋混凝土梁界面之间的粘结性能, 进行了7根GFRP布加固的钢筋混凝土梁与2根对比梁的试验研究.试验的变化参数为GFRP布层数、粘结长度及配筋率.试验结果表明, GFRP布加固的钢筋混凝土梁极限荷载显著提高, 但是发生剥离破坏的试验梁极限荷载有所降低, 粘结长度是影响加固梁剥离破坏的主要因素.根据试验结果提出了GFRP布与钢筋混凝土梁界面粘结剪应力的试验分析方法并分析了界面间粘结剪应力的分布.同时, 提出了GFRP布加固的钢筋混凝土梁剥离正应力与粘结剪应力的理论分析方法.最后, 给出了GFRP布加固钢筋混凝土梁剥离荷载的计算方法.为验证理论分析方法的正确性, 计算了试验梁界面间的粘结剪应力、剥离正应力及剥离荷载.计算结果表明, 所提出的理论分析方法与试验值吻合较好.
References:
[1] Wang Wenwei, Zhao Guofan, Huang Chengkui, et al.Experimental study of strengthening of reinforced concrete beams with externally bonded GFRP sheets [J].Journal of Dalian University of Technology, 2003, 43(6):799-805.(in Chinese)
[2] Wang Wenwei, Li Guo.Experimental study and analysis of RC beams strengthened with CFRP laminates under sustaining load [J].International Journal of Solids and Structures, 2006, 43(3):1372-1387.
[3] Yao W.Flexural strength and behavior of polypropylene fiber reinforced concrete beams[J].Journal of Wuhan University of Technology: Materials Science Edition, 2002, 17(3):54-57.
[4] Wang Wenwei, Zhao Guofan, Huang Chengkui, et al.An experimental study of strengthening of initially loaded reinforced concrete beams using CFRP sheets [J].Engineering Mechanics, 2001, 21(4):172-178.(in Chinese)
[5] Ye Lieping, Zhao Shuhong, Yue Qingrui, et al.Calculation of shear strength of concrete column strengthened with carbon fiber reinforced plastic sheet [J].Journal of Building Structures, 2000, 21(2):59-67.(in Chinese)
[6] Arduini Marco, Tommaso Angelo Di, Nanni Antonio.Parametric study of beams with externally bonded FRP reinforcement [J].ACI Structural Journal, 1997, 94(5):493-501.
[7] Malek Amir M, Saadatmanesh Hamid, Ehsani Mohammad R.Prediction of failure load of RC beams strengthened with FRP plate due to stress concentration at the plate end [J].ACI Structural Journal, 1998, 95(1):142-153.
[8] Xu Zhilun.Elasticity mechanics [M].Beijing:Higher Education Press, 1978.(in Chinese)
[9] Guo Zhenhai.Theory of reinforce concrete structures [M].Beijing:Tsinghua University Press, 1999.(in Chinese)
[10] Roberts T M.Approximate analysis of shear and normal stress concentration in the adhesive layer of plated RC beams [J].Structural Engineering, 1989, 12:228-233.
Memo
- Memo:
- Biography: Wang Wenwei(1971—), male, doctor, associate professor, wenwei_wang@163.com.