Study on concrete-filled double-skin circular steel tubes under axial compression

In this research, an attempt has been made to evaluate the performance of concrete-filled double-skin circular steel tubes (CFDSCT) under axial compression and their application in buildings in terms of performance. Concrete-filled double-skin steel tube (CFDST) is a composite construction component. It consists of two steel layers with concrete sandwiched in between the tubes. The inner hollow steel section acts as formwork and reinforcement for the concrete. CFDST has numerous advantages, which include high strength, high bending stiffness, and good seismic and fire performance. Moreover, this type of structural member is not being used largely in construction, hence it’s vital to investigate and obtain a clear analysis of the implementations. This study presents a detailed investigation of how CFDSCT columns behave under axial compression, by experimenting and further verifying it through analysis of the structural component by developing a numerical model using “ABAQUS” finite element software. The experimental results were further compared to theoretical calculations performed using the “Eurocode 4” design standard. The simulation and the theoretical data are in good compliance with the test results. Ultimately, using a numerical model developed with SAP2000 software, this study discusses the feasibility of using CFDST columns in buildings in seismic performance.