Abstract
The combined effect of internal steel ties and external FRP wrap was investigated using nine reinforced concrete columns with varying thickness of external wrap. The load, deflection and lateral expansions were studied at yield state and ultimate state. The results from the experimental investigations were used for performing a multi-variate linear regression analysis incorporating the contribution of tie spacing as a term. The predictions of the regression equation agreed well with the experimental results and showed sensitive difference in compressive strength for changes in tie spacing.
Highlights
Reinforced concrete columns require confinement in the lateral direction for enhanced performance against axial loads
The experimental results revealed that the spacing of internal steel ties and thickness of FRP wrap influenced the properties of the FRP confined reinforced concrete columns to a considerable extent
The compressive strength of FRP confined concrete column increased by a maximum of 159.21% for 5 mm thick UDCGFRP wrapped column
Summary
Reinforced concrete columns require confinement in the lateral direction for enhanced performance against axial loads. Wrapping with FRP is an additional measure for providing confinement to the reinforced concrete column, which is much more effective than the steel ties. Models are proposed for estimating the stress strain behaviour of FRP confined concrete under varying load transfer and geometric conditions. The behaviour of FRP confined reinforced concrete circular columns subjected to concentric loads and eccentric loads were studied. The regression equations proposed from the results of the investigation are suitable for estimating the compressive strength of reinforced concrete columns with spacing of internal ties as a parameter. The experimental investigations were carried out on nine reinforced concrete columns having 150 mm diameter, 1200 mm height, six rods of 8 mm diameter for longitudinal reinforcement and 6 mm diameter mild steel ties spaced at 115 mm, 165 mm and 215 mm for internal lateral confinement.
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