[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(
)
碳纤维布与钢构套复合加固锈蚀钢筋混凝土柱抗震性能
)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
- 碳纤维布与钢构套复合加固锈蚀钢筋混凝土柱抗震性能
- 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.
- 为改善锈蚀钢筋混凝土柱的抗震性能, 利用碳纤维布与角钢对锈蚀柱进行复合抗震加固. 试验共对12根试件进行了低周反复加载试验, 研究参量包括钢筋锈蚀程度、轴向荷载、碳纤维布层数和角钢用量. 试验结果表明, 利用碳纤维布和角钢复合加固锈蚀柱可以显著改善锈蚀柱的承载能力、延性和耗能能力. 复合加固后, 加固柱的强度和延性与锈蚀柱相比, 可分别提高0.9倍和1倍以上. 基于试验结果, 提出了计算加固构件屈服荷载、最大荷载和位移延性系数的简化公式, 计算结果与试验结果极为吻合.
References:
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[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)
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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.