THE COMPARISON OF THE SEISMIC PERFORMANCE OF BRBF AND EBF BRACED STRUCTURES WITH IRREGULARITY IN HEIGHT

Today, the traditional approach of designing buildings based on providing sufficient stiffness and strength is changed to a modern approach which has an important role in the absorption and dissipation of energy. Using details on the energy dissipation in structures considerably reduce the amount of materials used in the structure and therefore improve the structural behavior, technical standards and economic justification. Steel structural systems with buckling restrained (BRBF) and (EBF) braces seem appropriate for this purpose. This study examines the seismic behavior of steel braced frames BRB and EBF in structures having irregularity in height, considering their Response Modification Factors. The basic approach of this research is the study of plasticity effects on the resistance of structures through structural capacity curves using the change in the number of structural floors and the change in BRB bracing system including chevron V and chevron-inverted V. The seismic response of the studied systems is obtained by non-linear static analysis using software PERFORM-3D. The results showed a small difference between the calculated R factor and the existing codes for structures with irregularity in height.