Tensile Behavior of Concrete‐Filled Steel Tubular Column Splices Using Perforated Steel Plates

In conventional column splices of concrete‐filled steel tubes (CFSTs), the upper and lower steel tubes are typically connected through full‐penetration welding performed on‐site, ensuring that the strength of both steel tubes is maintained. This study focused on the presence of filled concrete within the steel tubes and proposed a CFST column splice design that facilitates stress transfer between the steel tubes through the infilled concrete. This design leverages the shear resistance provided by perforated steel plates that are welded to the steel tube. A pull‐out test was conducted on perforated steel plates, with the shape of the perforation and concrete strength utilized as parameters. This led to the development of a design formula aimed at predicting the maximum pull‐out strength of perforated steel plates. Additionally, a tensile experiment on CFST column splices incorporating these perforated steel plates was performed to analyze their behaviors and failure mechanisms. The findings suggest that the tensile strength of CFST column splices can be predicted using the proposed pull‐out strength formula for the perforated steel plates.