Abstract
This paper presents experimental, numerical and analytical investigations to evaluate the compressive behavior and size effect of square concrete columns internally reinforced with basalt fiber-reinforced polymer (BFRP) bars and ties. Nine BFRP reinforced concrete (RC) square columns were tested under axial compression. The main parameters included cross-sectional heights, transverse reinforcement ratios, and configuration of transverse BFRP ties. The compressive behaviors of BFRP RC columns were discussed in terms of axial load-strain response, confined strength, and ductility index. The results revealed that there was significant size effect on the confined efficiency and ductility. With the increasing cross-sectional height, the maximum decreases of confined efficiency and ductility index were 16.0% and 18.9% respectively. Moreover, a meso-scale numerical model considering the heterogeneity of concrete was developed and verified using the test results. A parametric analysis was then performed to evaluate the effects of cross-sectional height and transverse reinforcement ratio on the compressive performance of BFRP tie-confined concrete. Finally, a design-oriented stress-strain model was proposed considering the effect of cross-sectional height and transverse reinforcement ratio. The proposed model was validated using the test results in the present study and literature.
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