Analysis study on the performance of end directly connected triple steel tube buckling-restrained brace

This paper proposes an end directly connected triple steel tube buckling-restrained brace (EDTBRB), and introduces its composition and construction characteristics. ABAQUS finite element analysis is used to analyze the performance of the EDTBRB and Traditional triple steel tube buckling-restrained brace (TBRB for short) for the same design parameters. EDTBRBs with different design parameters were analyzed to investigate the effect of diameter-to-thickness ratio, length-to-diameter ratio and initial defects on the hysteresis performance of EDTBRBs. The analysis results show that the direct end connection improves the stress distribution at the end and effectively prevents the joint section from yielding or breaking before the core unit under seismic action, The difference in mechanical properties between the EDTBRB and the TBRB is within 10% and the mechanical properties are similar, The larger the diameter-to-thickness ratio and length-to- diameter ratio of the EDTBRB, the smaller the displacement amplitude when buckling occurs and the more likely the EDTBRB is to become unstable, It is recommended to design the EDTBRB with an upper limit of 15 and 30 for the diameter to thickness ratio and length to diameter ratio respectively, The size of initial imperfection has little effect on the hysteresis performance and energy dissipation performance of EDTBRB. © 2022 Editorial Office of China Civil Engineering Journal. All rights reserved.