The hollow-core fiber reinforced polymer(FRP)-concrete-steel(HC-FCS)column is a new type of concrete composite column,which is composed of an outer FRP tube,an inner steel tube and a concrete filling between these two tubes.The numerical simulations were conducted to investigate the an-tiknock performance of the HC-FCS column subjected to close-in blast loads.The numerical model was es-tablished with the Arbitrary Lagrangian-Eulerian(ALE)method,and the accuracy of the established mod-el was validated based on existing experimental results.With the validated numerical model,the propaga-tion process of the explosion shock wave,the development of concrete damage,the hoop strain in the FRP tube,the residual mechanical properties after the explosion,as well as relevant parameters,were ana-lyzed.The results demonstrate that the FRP tube is able to effectively confine the infilled concrete in the blast region during the close-in blast.Both the column's axial load capacity and axial stiffness are signifi-cantly decreased after the close-in blast.Increasing the thickness of FRP tubes and steel tubes,as well as reducing the hollow core ratio,can enhance the blast resistance of the HC-FCS column,with the first two factors having more significant effects.
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