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Seismic Response of a Steel Resilient Frame Equipped with Self-Centering Column Bases with Friction Devices

Elettore, E; Freddi, F; Latour, M; Rizzano, G; (2021) Seismic Response of a Steel Resilient Frame Equipped with Self-Centering Column Bases with Friction Devices. In: ce/papers. (pp. pp. 1710-1718). Wiley Green open access

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Abstract

In the last two decades many researchers focused on the development of innovative building structures with the aim of achieving seismic resilience. Among others, steel Moment Resisting Frames (MRFs) equipped with friction devices in beam-to-column joints have emerged as an effective solution able to dissipate the seismic input energy while also ensuring the damage-free behaviour of the system. How-ever, to date, little attention has been paid to their column bases, which represent fundamental com-ponents in order to achieve resilience. In fact, column bases designed by current conventional ap-proaches lead to significant seismic damage and residual drifts leading to difficult-to-repair structures. The present paper evaluates the seismic performance of steel MRFs equipped with an innovative dam-age-free, self-centring, rocking column base joints. The proposed column base consists of a rocking splice joint where the seismic behaviour is controlled by a combination of friction devices, providing energy dissipation capacity, and pre-loaded threaded bars with disk springs, introducing restoring forces in the joint. The design procedure of the column base is presented, a numerical OpenSees model is developed to simulate the seismic response of a perimeter seismic-resistant frame, including the hysteretic behav-iour of the connection. Non-linear dynamic analyses have been carried out on a set of ground motions records to investigate the effectiveness of the column base in protecting the first storey columns from yielding and in reducing the residual storey drifts. Incremental Dynamic Analyses are used to investigate the influence of the record-to-record variability and to derive fragility curves for the whole structure and for several local engineering demand parameters of the frame and of the column base connection. The results show that the damage-free behaviour of the column bases is a key requirement when self-cen-tering of MRFs is a design objective.

Type: Proceedings paper
Title: Seismic Response of a Steel Resilient Frame Equipped with Self-Centering Column Bases with Friction Devices
Event: The 9th European Conference on Steel and Composite Structures (Eurosteel 2020)
Location: Sheffield, UK
Dates: 01 September 2021 - 03 September 2021
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/cepa.1477
Publisher version: https://doi.org/10.1002/cepa.1477
Language: English
Additional information: © 2021 The Authors. ce/papers published by Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
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/10134313
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