Prediction of the Seismic Response of Steel Frames with Concentric Diagonal Bracings

M. Bosco*, A. Ghersi, E.M. Marino, P.P. Rossi
Department of Civil and Environmental Engineering, University of Catania, Italy.

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© 2013 Bosco et al.;

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Civil and Environmental Engineering, University of Catania, Italy; Tel: +39 095 7382274; Fax: +39 095 7382249; Emails: and


Concentrically braced frames and eccentrically braced frames are efficient seismic resistant systems but they are generally prone to develop storey collapse mechanisms. As underlined in some previous papers with regard to eccentrically braced frames, this tendency depends on the overstrength factors and damage distribution capacity factors resulting from the use of common design procedures. In this paper a previously proposed procedure which predicts the heightwise distribution of the damage at collapse of eccentrically braced frames is applied to concentrically braced frames. To apply this procedure, proper definitions of the overstrength factors and damage distribution capacity factors are derived. The effectiveness of the proposed procedure is tested on frames with concentric diagonal bracings characterised by different storey numbers and designed by common design procedures. The target response is provided by nonlinear dynamic analyses. The seismic input is constituted by ten artificial accelerograms. The paper proves that the proposed procedure is able to predict accurately the nonlinear dynamic response of systems in which the damage is mainly restricted to a few storeys. In the other cases, some not negligible scattering between actual and expected values of damage can be found at some storeys.

Keywords: Approximated method, concentrically braced frames, damage distribution capacity factor, factor, dual braced systems,, overstrength factor, seismic responser.