Experimental Work to Study the Strengthening Effect of SFR and CFRP on a Part or Whole of the Length of Slender RC Columns

Abstract

The This paper is focusses 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.

Effect of Imperfection Factors on Simulation of the Slender RC Columns Strengthened by SFR Using ABAQUS

“…Alaa Hussein Al-Zuhairi & Safaa Qays Abdulrahman in 2020 studied the performance of slender reinforced concrete columns with different cross-sectional shapes, the study aimed to use nonlinear finite element analysis to explain the structural performance of slender SSRC columns both experimentally and numerically [9]. Four samples were selected "first one normal concrete and the other three was strengthened with SFR" from an experimental study where don by Al-Helfi & Allami (the strengthening effect of SFR and CFRP on a part or whole of the of slender RC columns) one was a reference and others were compared [10] to investigate the material variation effect on the imperfection factor using ABAQUS/Standard 2020.…”

Nonlinear Analysis of Hollow Slender Reinforced Concrete Columns Subjected to Concentric and Eccentric Loads

“…As a result, study into their load capacity and failure modes is necessary [1]. To minimize the cost of the constructions and to lessen their self-weight where it is necessary, hollow columns have been recommended over solid columns [2,3]. In reinforced concrete columns, transverse openings and longitudinal holes are frequently included to give access for utilities like as plumbing and electrical wiring.…”