Freddi, F;
Ghosh, J;
Kotoky, N;
Raghunandan, M;
(2021)
Device uncertainty propagation in low-ductility RC frames retrofitted with BRBs for seismic risk mitigation.
Earthquake Engineering and Structural Dynamics
, 50
(9)
pp. 2488-2509.
10.1002/eqe.3456.
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Abstract
Passive control systems, such as buckling-restrained braces (BRBs), have emerged as efficient tools for seismic response control of new and existing structures by imparting strength and stiffness to buildings, while providing additional high and stable energy dissipation capacity. Systems equipped with BRBs have been widely investigated in literature; however, only a deterministic description of the BRBs’ properties is typically considered. These properties are provided by the manufacturer and are successively validated by qualification control tests according to code-based tolerance limits. Therefore, the device properties introduced within the structure could differ from their nominal design estimates, potentially leading to an undesired seismic performance. This study proposes a probabilistic assessment framework to evaluate the influence of BRBs’ uncertainty on the seismic response of a retrofitted RC frame. For the case study, a benchmark three-story RC moment-resisting frame is considered where BRBs’ uncertainty is defined compatible to the standardized tolerance limits of devices’ quality control tests. This uncertainty is implemented through a two-level factorial design strategy and Latin hypercube sampling technique. Cloud analysis and probabilistic seismic demand models are used to develop fragility functions for the bare and retrofitted frame for four damage states while also accounting for the uncertainty in the property of BRBs. Risk estimates are successively evaluated for three case study regions. The results show that, for the considered case study structure, these uncertainties could lead to an increase of fragility up to 21% and a variation in seismic risk estimates up to 56%.
| Type: | Article |
|---|---|
| Title: | Device uncertainty propagation in low-ductility RC frames retrofitted with BRBs for seismic risk mitigation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/eqe.3456 |
| Publisher version: | https://doi.org/10.1002/eqe.3456 |
| Language: | English |
| Additional information: | © 2021 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, fragility curves, reinforced concrete frames, seismic devices uncertainty, seismic retrofit, seismic risk variability |
| 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/10125764 |
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