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Shock and Vibration
Volume 2018 (2018), Article ID 5403737, 16 pages
Research Article

Stochastic Seismic Analysis and Comparison of Alternative External Dissipative Systems

1School of Architecture and Design, University of Camerino, Viale della Rimembranza, 63100 Ascoli Piceno, Italy
2Department of Civil and Environmental Engineering, University of Strathclyde, 75 Montrose Street, Glasgow G1 1XJ, UK
3Department of Civil and Building Engineering and Architecture, Università Politecnica delle Marche, Via Brecce Bianche, Ancona, Italy

Correspondence should be addressed to Laura Gioiella

Received 15 September 2017; Accepted 27 December 2017; Published 29 January 2018

Academic Editor: Ivo Caliò

Copyright © 2018 Laura Gioiella et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper deals with the seismic retrofit of existing frames by means of external passive dissipative systems. Available in different configurations, these systems allow high flexibility in controlling the structural behaviour and are characterized by some feasibility advantages with respect to dissipative devices installed within existing frames. In particular, this study analyzes and compares the performances of two external solutions using linear viscous dampers. The first is based on the coupling of the building with an external fixed-based steel braced frame by means of dampers placed horizontally at the floor levels. The second is an innovative one, based on coupling the building with a “dissipative tower,” which is a steel braced frame hinged at the foundation level, and activating the dampers through its rocking motion. The effectiveness of the two solutions is evaluated and compared by considering a benchmark existing reinforced concrete building, employing a stochastic dynamic approach, under the assumption of linear elastic behaviour for the seismic performance evaluation. This allows efficiently estimating the statistics of many response parameters of interest for the performance assessment and thus carrying out extensive parametric analyses for different properties of the external systems. The study results provide useful information regarding the design and the relative efficiency of the proposed retrofit solutions.