Wind-induced vibration control of tall buildings using hybrid buckling-restrained braces

• Published in: The structural design of tall and special buildings 2014-05, Vol.23 (7), p.549-562
• Main Authors: Kim, Do-Hyun, Ju, Young K., Kim, Myeong-Han, Kim, Sang-Dae
• Format: Article
• Language: English
• Subjects: buckling-restrained brace; hybrid damper; serviceability; tall building; time history analysis; viscoelastic damper
• ISSN: 1541-7794; 1541-7808
• DOI: 10.1002/tal.1066

SUMMARY A buckling‐restrained brace (BRB) is a system with excellent earthquake‐proof performance, but it does not dissipate energies caused by the load from weak earthquakes or winds. A hybrid BRB (H‐BRB), which improved the performance of the BRB, is a type of composite damper system consisting of a BRB and a viscoelastic damper. To explain the wind‐induced vibration control performance of H‐BRB, a 40‐story steel building was designed and used as an analysis model in this study, on the basis of the damping ratio from a structural performance test, using normal steel braces, BRB and H‐BRB. In addition, to evaluate the optimal location of H‐BRB, a time‐history analysis of four models was conducted in the study. For such time‐history analysis, wind‐load data in a 10‐year recurrence interval, which were calculated from the wind tunnel test, were used. The result of the time‐history analysis showed that H‐BRB is effective in improving both the lateral stiffness and serviceability of a building using the existing BRB. It also confirmed that it is most effective to position H‐BRBs mainly on the lower stories. Copyright © 2012 John Wiley & Sons, Ltd.