[1] 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. [doi:10.3969/j.issn.1003-7985.2007.04.017]

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Fatigue behavior of crane beam strengthened with CFRP()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

23

Issue:

2007 4

Page:

561-565

Research Field:

Civil Engineering

Publishing date:

2007-12-30

Info

Title:

Fatigue behavior of crane beam strengthened with CFRP

Author(s):

Shi Qiyin¹;  Li Aiqun²;  Hui Zhuo²

¹Department 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

Keywords:

RC crane beam;  structure strengthening;  fatigue test;  carbon fiber reinforced polymer(CFRP)

PACS:

TU375.1

DOI:

10.3969/j.issn.1003-7985.2007.04.017

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.

References:

[1] Wang Fengquan, Yang Yongzin, Yue Qingrui.FRP composite material and its application to civil engineering [J].Journal of Huaqiao University:Natural Science, 2005, 26(1):1-6.(in Chinese)
[2] CECS146 Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate[S].Beijing:China Planning Press, 2003.(in Chinese)
[3] Dong Yongtao.Static and fatigue performance of reinforced concrete beams retrofitted with external CFRP composites [D].University of Illinois at Chicago, 2003.
[4] Heffernan P J, Erki M A.Fatigue behavior of reinforced concrete beams strengthened with carbon fiber reinforced plastic laminates [J].Journal of Composites for Construction, 2004, 8(2):132-140.
[5] Ekenel Mahmut, Rizzo Andrea.Flexural fatigue behavior of reinforced concrete beams strengthened with FRP fabric and precured laminate systems [J].Journal of Composites for Construction, 2006, 10(5):433-442.
[6] Liu Muyu, Li Kaibing.Fatigue performance of RC beams strengthened with CFRP[J].China Civil Engineering Journal, 2005, 38(9):32-36.(in Chinese)
[7] Lu Xuan, Qiu Hongxing, Pang Linfei.The fatigue performance of reinforced concrete bending members strengthened with CFRP[J].Industrial Construction, 2005, 35(sup):962-965.(in Chinese)
[8] Ministry of Construction of the People’s Republic of China. GB 50152—92 Code for design of concrete structures[S].Beijing:China Architecture and Building Press, 1992.(in Chinese)
[9] American Concrete Institute. ACI-440 Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures[S].New York:ACI, 2000:53-54.
[10] Baluch M H, Shah A R, Al-Gadhib A H. Fatigue performance of concrete beams strengthened with CFRP plates [J]. Journal of Composites for Construction, 2000, 4(4):215.

Memo

Memo:

Biography: Shi Qiyin(1964—), male, doctor, professor, shiqiyin@ujs.edu.cn.

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