The most commonly used analysis method in performance-based design (PBD) is nonlinear static (NSA). In unsymmetrical 2D frames, unlike for the symmetrical state, NSA should be performed two lateral loading directions. This complicates process of achieving a feasible optimal addition to increasing volume calculations. this study, overcoming issue, two-step approach proposed PBD steel moment-resi...

Supplementary energy dissipation has proved to be an effective way of protecting structures from the disastrous effects earthquakes and been used in last decades both new existing constructions. In this regard, various procedures for design damping system seismic retrofit buildings have formulated over years, mainly focused on reinforced concrete (RC) constructions, which represent largest part...