Research on Modeling Methods of T-Shaped Steel-Concrete Filled Steel Tube Composite Special-Shaped Columns Based on Common Design Software

The T-shaped steel-concrete filled steel tube (CFST) composite special-shaped column is a kind of space grid structure formed by T-shaped steel and CFST. It has the outstanding advantages of non-protruding walls, excellent seismic performance, ease of construction, and convenient connection. This type of component not only retains the advantages of CFST and T-shaped steel, but also addresses issues like difficulties in connecting CFST columns with walls and steel beams, the weak flexural capacity of long columns, and the protrusion of components from the wall surface. However, there is no modeling method available for T-shaped steel-CFST composite columns that can be utilized by designers, which significantly limits the engineering demonstration and application of these innovative components. Therefore, the study aimed to conduct horizontal monotonic loading tests and investigate modeling methods of software for T-shaped steel-CFST composite columns. Based on validated modeling methods, the study explored the impact of different modeling methods on the mechanical properties of the T-shaped steel-CFST composite column structural system and provide design recommendations.