An Investigation of the Hysteretic Behavior of a Buckling-Restrained Brace Subsystem Frame with Out-of-Plane Eccentricity

This paper examines the differences in hysteretic behavior of buckling-restrained brace subsystem frames (BRBFs) with concentric and out-of-plane eccentric configurations. First, a quasi-static experiment was carried out on steel plate BRBF specimens to study the differences in mechanical properties, stability, and energy dissipation capacity between BRBFs with concentric and out-of-plane eccentric configurations. Second, a numerical simulation was carried out using the same steel plate BRBF specimens to study the difference in the stress distribution and high-order deformation patterns between the BRBFs with concentric and out-of-plane eccentric configurations. The test and numerical results showed that the out-of-plane eccentric BRBFs under in-plane quasi-static loads have different mechanical properties, larger compression strength adjustment factors (beta) under larger loading amplitudes, higher beta value increasing rates, lower equivalent viscous damping ratios (zeta), different yield processes, and different generation processes of high-order core deformation compared with the concentric BRBFs.

Automated summary

This paper examines the differences in hysteretic behavior of buckling-restrained brace subsystem frames (BRBFs) with concentric and out-of-plane eccentric configurations. The study found that the out-of-plane eccentric BRBFs have different mechanical properties and deformation patterns compared to the concentric BRBFs under in-plane quasi-static loads.