Experimental and numerical analysis reveals shear strength variations in hollow-core columns, indicating the need for improved predictive models.
The shear behavior of hollow-core composite short bridge columns is presented in this study. The investigated composite columns comprised a concrete wall between two concentric circular tubes, an outer circular fiber-reinforced polymer, and an inner steel tube to form hollow-core FRP-concrete-steel (HC-FCS) columns. Three-dimensional numerical models were developed and validated against experimental results. The model was used to conduct a parametric study. The investigated parameters are the effects of the column aspect ratio, steel tube width-to-thickness ratio, confinement ratio, concrete wall thickness, applied axial load level, and column concrete strength. A comparison between the attained shear strengths and the existing analytical models in the literature was carried out. A critical assessment of these shear strength models revealed vast differences in predicted responses. Finally, a new expression is proposed to predict the shear strength of HC-FCS columns.
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Abdulazeez et al. (2025) studied this question.
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