Abstract
Abstract This paper is focussed on the investigation of the strengthened column by steel-fibre-reinforced (SFR) and carbon fibre-reinforced polymer (CFRP) on a part or a whole of the length of the column under axial force, and to obtain the effective length, which is responsible for the increasing of the ability of the column to resist buckling. Seven samples were designed as slender reinforced columns with dimensions of 2000 mm length and cross-sections of 120 mm x 60 mm. It was shown that the strengthening of the middle half of the column length by SFR gave an ultimate load similar to the strengthening of the whole column with same material. Also, it was found that the column strengthened by SFR increased its ultimate load by 42.6 %, 42.1 % and 33.3 % for strengthened lengths of dimensions L, L/2 and L/3, respectively, compared to the non-strengthened column. The increase in ultimate load that could be borne by the column strengthened by CFRP were 53.0 % and 33.8 % for strengthened lengths of L and L/2, respectively, only. Interaction diagram had been depended as a theoretical analysis for slender concrete columns. The interaction diagram for the column strengthened by CFRP is greater than for the column strengthened by SFR, which in turn is greater than the non-strengthened column.
Highlights
Studies on slender reinforced concrete columns have historically focussed on the behaviour of columns with regard to parameters such as slenderness ratios and cross-sections [1,2,3,4,5,6]
The conclusions that can be drawn from the experimental work are as follows: 1) Strengthening of the slender columns by SFR over either a part or the whole of the length of column resulted in an increase in their resistance to buckling
2) Strengthening of the middle half of the column length by SFR gave an ultimate load similar to the strengthening of the whole column with the same material. This is important economically because it can save half of the material that would otherwise be used for strengthening. It can be considered the middle half of the column length is the effective length of the column
Summary
Studies on slender reinforced concrete columns have historically focussed on the behaviour of columns with regard to parameters such as slenderness ratios and cross-sections [1,2,3,4,5,6]. Various researchers have investigated the strengthening of slender reinforced concrete columns (SRCCs) using carbon fibre reinforced polymers (CFRP) composites and steel-fibrereinforced (SFR) columns. Research in this field was started by G. (2012) [10] showed the effects of slender rectangular reinforced concrete columns strengthened by CFRP via two methods. They proved that the effects of CFRP in terms of increasing the strength of the columns was comparatively greater than for short RC columns subjected to compression. Various associated parameters were studied such as axial load level, Civil and Environmental Engineering
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