Aljawhari, K;
Freddi, F;
Galasso, C;
(2019)
Vulnerability of Case-Study Reinforced Concrete Frames to Mainshock-Aftershock Sequences.
In:
Conference on Earthquake & Civil Engineering Dynamics (SECED 2019) Proceedings.
SECED: London, UK.
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Abstract
This study investigates the effect of mainshock-aftershock sequences on numerical fragility and vulnerability relationships of European reinforced concrete (RC) moment-resisting frames (MRFs). A four-storey, four-bay nonductile RC MRF is selected for illustrative purposes. This index building is representative of a typical vulnerability class in the Mediterranean region. The influence of the masonry infills on seismic performance is also investigated. An advanced numerical nonlinear model is developed for the case-study frame and then assessed through nonlinear dynamic analysis using both real and artificial mainshock-aftershock sequences, via a ‘sequential cloud’ approach. The obtained seismic demand estimates allow to generate fragility functions for the undamaged frame when subjected to mainshocks only. Moreover, statedependent fragility functions are derived for the mainshock-damaged frame when subsequently subjected to aftershocks. Damage-to-loss models, specifically calibrated on Italian postearthquake data, are used to derive vulnerability functions for this case-study structure. Preliminary results from the study show that the frame experiences severe damages and high losses for a range of ground-motion shaking intensities, with a clear damage increase due to aftershocks. An attempt to generate vector-valued mainshock-aftershock vulnerability relationships is finally presented. The proposed vulnerability surfaces can be more easily implemented into a time-dependent risk assessment framework.
| Type: | Proceedings paper |
|---|---|
| Title: | Vulnerability of Case-Study Reinforced Concrete Frames to Mainshock-Aftershock Sequences |
| Event: | Conference on Earthquake & Civil Engineering Dynamics (SECED) |
| Location: | London |
| Dates: | 09 September 2019 - 10 September 2019 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://www.seced.org.uk/index.php/proceedings |
| Language: | English |
| Additional information: | The author accepted manuscript is deposited under a Creative Commons Attribution Non-commercial International Licence 4.0 (CC BY-NC 4.0) and any reuse is allowed in accordance with the terms outlined by the licence. To reuse the author accepted manuscript for commercial purposes, permission should be sought by contacting seced@ice.org.uk |
| 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/10087607 |
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