Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (10): 78-83.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Ultimate Strength of Reinforced Concrete Columns Strengthened by Circular Steel J acketing

Cai Jian  Xu Jin   

  1. Dept. of Civil Engineering , South China Univ. ofTech. , Guangzhou510640 , Guangdong , China
  • Received:2007-03-27 Online:2007-10-25 Published:2007-10-25
  • Contact: Cai Jian (bom in 1959), male , professor , doctoral supervisor ， mainly researches on reinforced concrete structureand steel-concrete composite structure. E-mail:cvjcai@scut. edu. cn
  • About author:Cai Jian (bom in 1959), male , professor , doctoral supervisor ， mainly researches on reinforced concrete structureand steel-concrete composite structure.
  • Supported by:

    Supported by Guangdong Provincial NaturalScience F oundation (020965)

PDF

616

Abstract:

This paper presents an experimental research on 33 reinforced concrete columns strengthened by circular steel jacketing subjected to axial or eccentric load , and investigates the mechanical properties of the strengthened columns with different original axial compressive ratios , steel jacketing thicknesses , slendemess ratios and eccentricity ratios. Experimental results show that (1) the mechanical properties of the reinforced concrete columns are greatly improved by the strengthening; (2) the ultimate strength of the strengthened CQlumns decreases with the increase in slendemess ratio and eccentricity ratio; and (3) the effect of the original axial compressive ratio on the ultimate strength can be ignored. Furthermore , a practical formula is proposed based on the experimental results to calculate the ultimate strength of the reinforced concrete columns strengthened by circular steel jacketing. The calculated results accord well with the experimental ones.

Key words: strengthening, circular steel jacketing, reinforced concrete column, ultimate strength