Seismic Performance of Concrete Column Connection with Square-Upper-Circular-Lower Steel Tube for Antique Buildings

The antique building combines traditional design with contemporary technology, making it an important structural style. Columns, as a crucial component, directly affect how well the functions whole. This paper proposes new connection form upper square concrete-filled steel tube-lower circular tube (USCFST-LCCFST). study investigates seismic performance of proposed columns. First, finite element software ABAQUS-2021 is used to simulate and analyze forms lower reinforced concrete (USCFST-LCRC) (USSRC-LCRC) above building, respectively, which confirms rationality modeling method explored in this paper. Then, geometric USCFST-LCCFST performed using ABAQUS. Simulation results demonstrate superior form. In addition, influence law yield strength ratio column linear stiffness on its are analyzed determined through variational parameter analysis components recommended be 355–420 MPa should no less than 0.063. order ensure good connection, efficiently controlled buildings’ components.