Techno Press

Steel and Composite Structures   Volume 19, Number 5, November 2015, pages 1077-1094
Slender RC columns strengthened with combined CFRP and steel jacket under axial load
Yi-yan Lu, Na Li, Shan Li and Tian-yan Ou

Abstract     [Full Text]
    This paper presents an experimental study on the effectiveness of simultaneous application of carbon fiber-reinforced polymer (CFRP) and steel jacket in strengthening slender reinforced concrete (RC) column. The columns were 200 mm square cross section with lengths ranging from 1600 to 3000 mm. Ten columns were tested under axial load. The effects of the strengthening technique, slenderness ratio, cross-section area of steel angle and CFRP layer number were examined in terms of axial load-axial strain curve, CFRP strain, steel strip strain and steel angle strain. The experiments indicate that strengthening RC columns with combined CFRP and steel jacket is effective in enhancing the load capacity, ductility and energy dissipation capacity of RC column. Based on the existing models for RC columns strengthened with CFRP and with steel jacket, a design formula considering a slenderness reduction factor is proposed to predict the load capacity of the RC columns strengthened with combined CFRP and steel jacket. The predictions agree well with the experimental results.
Key Words
    reinforced concrete column; strengthening; steel jacket; CFRP; axial load; load capacity
School of Civil Engineering, Wuhan University, Wuhan City, Hubei Province, China.

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