Freddi, F;
Tubaldi, E;
Zona, A;
Dall'Asta, A;
(2020)
Seismic performance of dual systems coupling moment-resisting and buckling-restrained braced frames.
Earthquake Engineering and Structural Dynamics
10.1002/eqe.3332.
(In press).
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Freddi et al_2020_Seismic performance of dual systems coupling moment‐resisting and buckling‐restrained braced frames.pdf - Published Version Download (3MB) | Preview |
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.
| Type: | Article |
|---|---|
| Title: | Seismic performance of dual systems coupling moment-resisting and buckling-restrained braced frames |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/eqe.3332 |
| Publisher version: | https://doi.org/10.1002/eqe.3332 |
| Language: | English |
| Additional information: | © 2020 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | buckling‐restrained braces, cumulative ductility, dual systems, moment‐resisting frames, nondimensional analysis, seismic performance |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10108915 |
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