Seismic evaluation of steel BRB frames with geometrical irregularities using the AHP method

The main objective of this study is to assess the seismic performance of Special Moment-Resisting (SMF) steel structures braced with Buckling-Restrained Braces (BRBs) using the Analytical Hierarchic Process (AHP) method in different seismically hazardous zones. Adopting this method for the analysis, the appropriate structural configuration for each zone is determined. In this regard, Spectrum analyses were carried out on multi-story buildings. Subsequently, linear time-history analyses were performed based on available seismic records. Obtained results indicate that the lateral displacement in BRB frames is less than that of moment-resisting frames but the base shear force and moment values are higher. Moreover, the absorbed energy in both structures is approximately the same which reveals the high capacity of BRBs. Finally, based on comparisons made between two systems, better seismic performance was observed for BRB systems for far-field faults while the reverse was true for near-field faults.

کلیدواژه ها:

Moment-resisting frames ، BRB frames ، spectrum analysis ، time-history analysis