Ghosh, J;
Freddi, F;
(2021)
Metamodeling choices for seismic vulnerability assessment of BRB-retrofitted low-ductility RC frames.
In:
Proceedings of the 8 th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering COMPDYN 2021: Vol 2.
(pp. pp. 4078-4090).
Institute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens (NTUA) Greece: Athens, Greece.
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Ghosh and Freddi - Compdyn 2021 - Paper - Metamodeling Choices for Seismic Vulnerability Assessment of BRB-Retrofitted Low-Ductility RC Frames_vFinal.pdf - Published Version Download (2MB) | Preview |
Abstract
Damage incurred in low-ductility reinforced concrete (RC) buildings during recent earthquakes continues to underline their structural vulnerability under seismic shaking. Among the viable seismic retrofitting procedures, passive control systems such as buckling-restrained braces (BRBs) have emerged as an efficient strategy for structural damage mitigation through stable energy dissipation while providing additional strength and stiffness to low-ductility buildings. Although quantifying the beneficial effects of BRBs for vulnerability reduction through seismic fragility curves has been suitably investigated in literature, almost all such studies consider a deterministic description of the BRB device. This study illustrates a metamodeling framework rooted in statistical learning techniques for efficient seismic vulnerability assessment of BRB-retrofitted low-ductility RC frames. The framework develops multidimensional probabilistic seismic demand models for response prediction of a case study retrofitted frames as a function of ground motion characteristics as well as the design parameters of the BRB device. These demand models when compared against damage states capacity estimates subsequently yields vector-based seismic fragility functions that provide notable advantages over unidimensional fragility curves in terms of efficiency as well as generality. Additionally, uncertainties stemming from a multitude of sources can also be conveniently captured and propagated through the different stages of statistical model development. The proposed study aims to help researchers, stakeholders, and even device manufactures by providing a convenient tool for vulnerability evaluation of retrofitted structures with reasonable accuracy and enhanced efficiency of computation.
| Type: | Proceedings paper |
|---|---|
| Title: | Metamodeling choices for seismic vulnerability assessment of BRB-retrofitted low-ductility RC frames |
| Event: | COMPDYN 2021: 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering |
| Location: | Athens |
| Dates: | 27 June 2021 - 30 June 2021 |
| ISBN-13: | 978-618-85072-4-1 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://2021.compdyn.org/ |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Buckling-Restrained Braces, Reinforced Concrete Frames, Seismic Retrofit, Seismic Devices Uncertainty, Metamodeling. |
| 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/10132128 |
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