Seismic performance of multistorey steel concentrically braced frames equipped with friction dampers

Abstract

In this paper the performance of concentrically braced frames with friction dampers in the bracing is analysed. For this purpose an experimental program was performed to determine the behaviour of the dampers and of the damper with brace assemble. Numerical analyses were performed on 2 types of concentrically braced frames were analysed using 2 sets of seismic motions recordings scaled to the design spectra. All the analyses were made with two distinct types of dampers placed in the braces and comparing the results with the coresponding structures without dampers. Base on the results of the numerical program a design methodology was proposed for each damper type and exemplified in relevant case studies.