SLENDER RECTANGULAR CONCRETE COLUMNS （纤细的矩形混凝土柱）.pdfVIP

SLENDER RECTANGULAR CONCRETE COLUMNS STRENGTHENED BY CFRP CONFINEMENT AND NSMR Katarina GAJDOSOVA Eng. PhD. Department of Concrete Structures and Bridges, Faculty of Civil Engineering, Slovak University of Technology Radlinskeho 11, 813 68 Bratislava, Slovakia katarina.gajdosova@stuba.sk* Juraj BILCIK Prof. Eng., PhD. Department of Concrete Structures and Bridges, Faculty of Civil Engineering, Slovak University of Technology Radlinskeho 11, 813 68 Bratislava, Slovakia juraj.bilcik@stuba.sk Abstract Present trends demand the preservation of the slenderness of strengthened structures, especially columns. Results of introduced investigation demonstrate a significant difference between slender and short column strengthening. This paper presents the effectiveness of the use of carbon fibre reinforced polymers for slender reinforced concrete columns strengthening. To verify the theoretical assumptions and the 3D nonlinear numerical analysis, full-scale specimens with rectangular cross-sections were tested under eccentric compressive loading to failure. Tested specimens were divided into four series: non-strengthened columns, columns confined with a single layer of CFRP sheet, columns strengthened by CFRP strips in NSMR form and columns strengthened by combination of mentioned methods. Failure mode, compression force of resistance, deflection, strains in the most stressed cross-section and utilization of CFRP in strengthened members were the most serious variables measured. The results indicated that the effect of strips in NSMR method enhanced the behaviour of slender columns and CFRP sheets enhanced the behaviour of short columns. Keywords: CFRP, column, slenderness, strengthening. 1. Introduction Fibre reinforced polymers are used for strengthening in the civil engineering practice mostly for their biggest advantage – the