Evaluation of Behavior Factor of Buckling Restrained Braced Steel Frames
Numerous studies were published in the last decades about the hysteresis behavior of buckling restrained brace (BRB). Its behavior was compared with other types of bracings and structural systems in order to demonstrate the advantage of BRB.
Engineers design the structures to resist the seismic forces using linear methods such as equivalent lateral force method and modal response analysis. Nevertheless, the structures are responding inelastically. Seismic performance factors are used to estimate the nonlinear seismic demands through linear analyses.
The behavior factor q of BRBFs is not addressed in the European Code EC8. Nonetheless, Vigh, Zsarnóczay and Balogh proposed a design methodology and a value of q for BRBFs. This paper aims to evaluate the behavior factor q of buckling restrained braced steel frames. It will provide a brief summary about two methods of assessment adopted in FEMA P-695 and ATC 19 as well.
Buildings with different heights and seismic demands are considered in this study. Inverted V is the configuration of bracing system of buildings. Beam-column connections are considered as hinges. The columns have fixed support. Therefore, columns and bracings will resist the lateral loads. Results of evaluation in both approaches will be compared to adopt a proper value of q for design.
Szerkezet-építőmérnök mesterszak (MSc)