Abstract
Wrapping reinforced concrete (RC) columns with fiber reinforced polymer (FRP) composites is effective in increasing their capacity. The current state of the art concentrates primarily on fully wrapped columns and few studies dealt with partially wrapped ones. The objective herein is to evaluate the effectiveness of partial wraps (or strips) and to develop a confined concrete compressive stress–strain (fc − εc) model that accounts for partial wrapping. Three-dimensional finite element (FE) models are generated to evaluate the influence of different parameters on the behavior of concentrically loaded RC circular columns that are partially and fully wrapped with FRP. The results indicated an increase in ductility as the number of FRP strips is increased, and revealed that longitudinal steel had little influence on the confined fc − εc relationship. The proposed fc − εc model, derived from the parametric study, accounts for the effect of partial and full confinement, the unconfined concrete strength f^{prime}_{c} , and yielding of transverse steel. Comparison of the results generated using the proposed model with FE and experimental results are in good agreement.
Highlights
The application of fiber reinforced polymer (FRP) wraps to reinforced concrete (RC) columns is an established and efficient technique for enhancing the capacity of columns
7 Conclusions This paper evaluated the effectiveness of partial wraps and proposed an analytical model for describing the compressive behavior of RC columns that are partially and fully wrapped with FRP
It should be noted that the columns wrapped with one, two, or three strips are not of practical interest and are used to illustrate the influence of partial wrapping as the analysis transitions from an unwrapped column to a partially wrapped column with one to seven strips, to a fully wrapped column
Summary
The application of fiber reinforced polymer (FRP) wraps to reinforced concrete (RC) columns is an established and efficient technique for enhancing the capacity of columns. Four groups of columns (Table 2) are studied to evaluate the influence of different parameters on the confined concrete stress (fc), axial strain (εc) and lateral strain (εl). The change in the strength ratios fc′c fc′ , strain ratios εccu εc′ , and ductility factors (μ), due to the increase in the longitudinal steel reinforcement ratio has a little influence on concrete confinement for the columns under consideration
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