Abstract
Recently, steel fibre reinforced polymers (SFRP) sheets have been introduced for the repair and rehabilitation of concrete structures. Few researchers studied the behaviour of the concrete columns wrapped with SFRP sheets; however, several critical parameters such as the cost and ductility effectiveness of the SFRP wrapped concrete columns have been lightly addressed. Thus, the main objective of this paper is to study the cost and ductility effectiveness of SFRP wrapped concrete columns and compare the results with the conventionally used carbon FRP (CFRP) wrapped concrete columns. In addition, an analytical procedure to predict the cost effectiveness of SFRP wrapped concrete columns is also suggested, from which, a parametric study was conducted. The parametric study investigated the effect of the concrete strength, the number of SFRP layers, and the size and slenderness effects on the cost effectiveness of the concrete columns wrapped with SFRP sheets. The results from the cost and ductility effectiveness study indicated that the SFRP wrapped concrete columns showed enhanced performance over the CFRP wrapped concrete columns. The suggested analytical procedure proved to be a reliable and accurate method to predict the cost effectiveness parameter of SFRP wrapped concrete columns. The parametric study showed the significant impact of the investigated parameters on the cost effectiveness of concrete columns wrapped with SFRP sheets.
Highlights
Strengthening of reinforced concrete (RC) columns using fibre reinforced polymers (FRP) is one of the very efficient methods to enhance the strength and ductility of the concrete
The results indicate that the non-reinforced concrete (NRC) columns wrapped with the carbon FRP (CFRP) sheets (NR-CFRP-RT and NR-CFRP-EE) had higher cost effectiveness parameters than the CFRP wrapped
The columns with 40 MPa concrete strength wrapped with two layers and three layers of the steel FRP (SFRP) sheets had higher cost effectiveness parameters by up to 16% and 7%, respectively, over the concrete columns wrapped with one layer of the SFRP sheet (Figure 11)
Summary
Strengthening of reinforced concrete (RC) columns using fibre reinforced polymers (FRP) is one of the very efficient methods to enhance the strength and ductility of the concrete. The cost and ductility effectiveness parameters are other criteria required to evaluate the effectiveness of the SFRP sheets for confinement applications. In this paper, the cost and ductility effectiveness parameters of SFRP and CFRP wrapped concrete columns are evaluated and compared. Limited information on design procedures related to SFRP wrapped concrete columns is available in the literature [23]. Abdelrahman and El-Hacha [23] proposed an equation to predict the ultimate strength of concrete columns wrapped with SFRP sheets. The proposed equation showed accurate predictions of the SFRP confined concrete strength, when compared to the experimental data [23]. The proposed equation has been incorporated into an analytical procedure to predict the cost effectiveness of SFRP wrapped concrete columns. A parametric study on the cost effectiveness is performed, where the variables investigated were the concrete strength, number of SFRP layers, slenderness and size effects
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