Seismic performance of dual systems coupling moment-resisting and buckling-restrained braced frames

Freddi, Fabio and Tubaldi, Enrico and Zona, Alessandro and Dall'Asta, Andrea (2021) Seismic performance of dual systems coupling moment-resisting and buckling-restrained braced frames. Earthquake Engineering & Structural Dynamics, 50 (2). pp. 329-353. ISSN 1096-9845 (https://doi.org/10.1002/eqe.3332)

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Abstract

Buckling-restrained braces (BRBs) have proven to be very effective in improving the seismic performance of existing and new structures. They provide strength, stiffness and add energy dissipation to the structure. However, being BRBs characterized by a low post-elastic stiffness, their use may lead to residual deformations hindering the building's reparability and to excessive cumulative ductility demand possibly compromising the residual capacity of BRBs. To overcome these drawbacks, BRB frames (BRBFs) can be coupled with moment-resisting frames (MRFs) to form dual systems. If properly designed, MRFs acting as back-up frames allow the control of the residual drifts and the optimization of the performance of the BRBs. The contribution of this study is to provide insights into the performance and residual capacity of BRBFs-MRFs dual systems and to shed light on the influence of the main BRB's design parameters. To this end, a nondimensional formulation of the equation of motion is introduced for a single degree of freedom system, and an extensive parametric study is performed for a set of natural ground motion records with different characteristics and scaled to various intensity levels. This allows the investigation of a wide range of configurations, considering different levels of the relative strength and ductility demand of BRBFs and MRFs, and obtains useful information for their design. Finally, two case study frames, modeled as two-dimensional nonlinear multi-degree of freedom systems, are analyzed, and the results were compared to those obtained from the nondimensional formulation to show the capabilities and the limitations of the adopted methodology and of the SDOF approximation.

  • Item type:Article
    ID code:73289
    Dates:
    Date
    Event
    13 January 2021
    Published
    29 August 2020
    Published Online
    17 July 2020
    Accepted
    Notes:© 2020 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd Freddi F, Tubaldi E, Zona A, Dall'Asta A. Seismic performance of dual systems coupling moment-resisting and buckling-restrained braced frames. Earthquake Engng Struct Dyn. 2021; 50: 329–353. https://doi.org/10.1002/eqe.3332
    Subjects:Technology > Engineering (General). Civil engineering (General)
    Department:Faculty of Engineering > Civil and Environmental Engineering
    Depositing user: Pure Administrator
    Date deposited:22 Jul 2020 13:10
    Last modified:11 Nov 2024 12:46
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/73289
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