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Seismic Performance of Steel Dual Systems with BRBs And Moment-resisting Frames

Tubaldi, E; Freddi, F; Alessandro, Z; Andrea, D; (2018) Seismic Performance of Steel Dual Systems with BRBs And Moment-resisting Frames. Presented at: 16th European Conference on Earthquake Engineering, Thessaloniki, Greece. Green open access

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Abstract

Buckling-restrained braces (BRBs) are energy dissipation devices which have proven to be very effective in improving the performance of existing and new building frames. However, their post-elastic stiffness may lead to excessive residual deformations in the systems to be protected, and this may cause irreparable damage and jeopardize the capability of withstanding multiple shocks. Previous studies demonstrated that buckling-restrained braced frames (BRBFs) can be used in conjunction with special moment-resisting frames to form a dual system, able to minimize the residual drifts and optimize the performances of the BRBFs. The objective of this present paper is to provide recommendations regarding the proportioning in terms of forces, stiffness and ductility of the two systems. For this purpose, an extensive parametric analysis under the single degree of freedom approximation for the dual system is carried out to shed light on the parameters that control the seismic performance and residual capacity of frames equipped with BRBs. A non-dimensional formulation of the problem allows investigating wide ranges of configurations, including the case of BRBFs and the case of BRBFs forming a dual system with moment-resisting frames. The results of this study provide useful information for the preliminary sizing and the optimal choice of the design parameters of structural systems equipped with BRBs.

Type: Conference item (UNSPECIFIED)
Title: Seismic Performance of Steel Dual Systems with BRBs And Moment-resisting Frames
Event: 16th European Conference on Earthquake Engineering
Location: Thessaloniki, Greece
Dates: 17th-21st June 2018
Open access status: An open access version is available from UCL Discovery
Publisher version: http://papers.16ecee.org/files/03%20Paper%2016ECEE...
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Buckling-Restrained Braces; Dual Systems; Cumulative Ductility; Residual Displacement; Seismic Performance
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10046014
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