This paper aims to obtain material properties essential for designing the seismic performance of high‑rise buildings. Specifically, it investigates the cyclic behavior of SN490B, a structural steel commonly used as a primary material in tall buildings, through material tests conducted under complex loading conditions. The testing approach employed in this study—multiaxial strain‑controlled experiments using extensometers—is relatively advanced, and the successful implementation of such methods is commendable.
At the same time, the amount of experimental data presented appears somewhat limited. It would be interesting to see whether other major construction materials exhibit cyclic characteristics similar to those of SN490B, and I look forward to future research developments in this area.