Seismic Upgrade of Steel Frame Buildings by Using Damped Braces

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 stock many seismic-prone countries. The study deals with assessment a displacement-based procedure proportioning recently proposed literature RC framed buildings, goal establishing good practice application steel as well. method was applied three case-study frames, regular plan elevation, were assumed being representative old designed without consideration requirements. performed by using chevron braces equipped dampers elastic-perfectly plastic behavior. aimed at defining properties achieve target performance terms maximum lateral deflection specific level intensity. effectiveness reliability eventually assessed evaluating upgraded static dynamic non-linear analyses.