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Calibration of Damage-to-loss Ratios for a Case-study Structure

Aljawhari, K; Gentile, R; Galasso, C; (2022) Calibration of Damage-to-loss Ratios for a Case-study Structure. In: Proceedings of the 12th National Conference on Earthquake Engineering, NCEE 2022. Earthquake Engineering Research Institute: Salt Lake City, UT, USA. Green open access

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Abstract

This study illustrates a simulation-based procedure for calibrating structure-specific damage-to-loss ratios (DLRs), which link the earthquake-induced global damage states (DSs) of a structure with the resulting loss ratios (repair costs normalized by replacement costs). A non-ductile reinforced-concrete frame representative of those built in Italy before the 1970s is selected as a case study. An advanced numerical non-linear model is developed to simulate its dynamic response and failure modes, including flexure, shear, and joint mechanisms. The calibration procedure starts by defining structure-specific DSs describing the increasing structural/nonstructural damage levels and their story-drift thresholds using pushover analysis. Building-level fragility functions are subsequently developed to quantify the probabilities of exceeding each DS given any ground-shaking intensity level. Component-based seismic loss assessment is then performed following the FEMA P-58 approach, which adopts simulation to quantify such losses at multiple ground-shaking intensities. Next, each DLR is statistically characterized by fitting a beta distribution to the component-based loss results upon being conditioned on the corresponding global DS. It is finally shown that the simplified losses obtained by combining the derived DLRs with the building-level fragility functions are highly consistent with their component-based counterparts. This indicates that such DLRs can be easily utilized in seismic risk assessment, particularly for building portfolios, offering a trade-off between accuracy and computational time/effort.

Type: Proceedings paper
Title: Calibration of Damage-to-loss Ratios for a Case-study Structure
Event: 12th National Conference on Earthquake Engineering, NCEE 2022
Open access status: An open access version is available from UCL Discovery
Publisher version: https://12ncee.org/program/proceedings
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.
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/10157902
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