Non-linear Finite Element Simulation of Rectangular Hybrid FRP-Concrete-Steel Double-Skin Tubular Columns Under Axial Compression

This paper presents a comprehensive non-linear finite element analysis (NLFEA) conducted using ABAQUS software to investigate the compressive behavior of rectangular hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs). The study involves 36 real-scale models with varying parameters, including the outer FRP tube aspect ratio, outer FRP tube thickness, inner steel tube thickness, and concrete filling inside the inner steel tube. The accuracy and reliability of NLFEA models were rigorously validated against experimental results demonstrating a small error of approximately 4%. This validation process ensures the accuracy of the numerical simulations in replicating the observed behaviors in real-world experiments. The findings underscore the significant influence of design parameters on the axial load-bearing capacity while navigating trade-offs between axial stress and strain of confined concrete in rectangular hybrid DSTCs.