[1] Li Jinbo, Gong Jinxin,. Seismic strengthening of reinforced concrete columns damagedby rebar corrosion using combined CFRP and steel jacket [J]. Journal of Southeast University (English Edition), 2009, 25 (4): 506-512. [doi:10.3969/j.issn.1003-7985.2009.04.019]

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Seismic strengthening of reinforced concrete columns damagedby rebar corrosion using combined CFRP and steel jacket()

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

Volumn:

25

Issue:

2009 4

Page:

506-512

Research Field:

Civil Engineering

Publishing date:

2009-12-30

Info

Title:

Seismic strengthening of reinforced concrete columns damagedby rebar corrosion using combined CFRP and steel jacket

Author(s):

Li Jinbo;  Gong Jinxin

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Keywords:

reinforced concrete column;  seismic performance;  corrosion;  retrofitting;  steel jacket;  fiber-reinforced polymer(FRP);  ductility

PACS:

TU375.1

DOI:

10.3969/j.issn.1003-7985.2009.04.019

Abstract:

In order to study the effectiveness of combined carbon fiber-reinforced polymer(CFRP)sheets and steel jacket in strengthening the seismic performance of corrosion-damaged reinforced concrete(RC)columns, twelve reinforced concrete columns are tested under combined lateral cyclic displacement excursions and constant axial load. The variables studied in this program include effects of corrosion degree of the rebars, level of axial load, the amount of CFRP sheets and steel jacket. The results indicate that the combined CFRP and steel jacket retrofit-ting technique is effective in improving load-carrying, ductility and energy absorption capacity of the columns. Compared with the corrosion-damaged RC column, the lateral load and the ductility factor of many strengthened columns increase more than 90% and 100%, respectively. The formulae for the calculation of the yielding load, the maximum lateral load and the displacement ductility factor of the strengthened columns under combined constant axial load and cyclically increasing lateral loading are developed.The test results are also compared with the results obtained from the proposed formulae.A good agreement between calculated values and experimental results is observed.

References:

[1] Shi Qingxuan, Niu Ditao, Yan Guiyun. Experimental research on hysteretic characteristics of corroded RC members with flexural and compressive axial loads under repeated horizontal loading[J]. Earthquake Engineering and Engineering Vibration, 2000, 20(4): 44-50.(in Chinese)
[2] Gong Jinxin, Zhong Weiqiu, Zhao Guofan. Experimental study on low-cycle behavior of corroded reinforced concrete member under eccentric compression[J]. Journal of Building Structures, 2004, 25(5): 92-104.(in Chinese)
[3] Niu Ditao, Chen Xinxiao, Wang Xuemin. Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J]. Building Structure, 2004, 34(10): 36-38.(in Chinese)
[4] Belarbi Abdeldjelil, Bae Sang-Wook. An experimental study on the effect of environmental exposures and corrosion on RC columns with FRP composite jackets[J]. Composites Part B: Engineering, 2007, 38(6): 674-684.
[5] Maaddawy T. Behavior of corrosion-damaged RC columns wrapped with FRP under combined flexural and axial loading[J]. Cement and Concrete Composites, 2008, 30(6): 524-534.
[6] Lu Yiyan, Chen Shaoxiong, Zhao Guofan. An experimental study on the seismic behavior of reinforced concrete column strengthened with bonded steel hoops and carbon fiber reinforced polymer sheet[J]. China Civil Engineering Journal, 2005, 38(8): 10-17.(in Chinese)
[7] Sheikh S A, Yau G. Seismic behavior of concrete columns confined with steel and fiber-reinforced polymers[J]. ACI Structural Journal, 2002, 99(1): 72-80.
[8] Zhong Weiqiu, Gong Jinxin. Control method for quick electrochemical corrosion experiment of rebars[J]. Building Technique Development, 2002, 29(4): 28-29.(in Chinese)
[9] Wang Guangyuan. Practical methods of optimum seismic design for engineering structures and systems[M]. Beijing: China Architecture & Building Press, 2000: 66-68.(in Chinese)

Memo

Memo:

Biographies: Li Jinbo(1981—), male, doctor; Gong Jinxin(corresponding author), male, doctor, professor, gong_-jx.vip@eyou.com.
Foundation item: The Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China(No.IRT0518).
Citation: Li Jinbo, Gong Jinxin. Seismic strengthening of reinforced concrete columns damaged by rebar corrosion using combined CFRP and steel jacket[J]. Journal of Southeast University(English Edition), 2009, 25(4): 506-512.

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