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Investigating ground-motion duration effects on building portfolio loss estimates

Otárola-Madrigal, K; Gentile, R; Sousa, L; Galasso, C; (2021) Investigating ground-motion duration effects on building portfolio loss estimates. In: Papadrakakis, M and Fragiadakis, M, (eds.) COMPDYN 2021: 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering: Proceedings, Volume I. (pp. pp. 3360-3376). Institute of Research and Development for Computational Methods in Engineering Sciences (ICMES): Athens, Greece. Green open access

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Abstract

Earthquake-induced ground-motion duration can be an important factor to consider when assessing ground-motion damage potential, as evidenced by recent earthquake events worldwide. In current practice, duration is commonly relegated to implicit, qualitative considerations. This study introduces a framework to explicitly quantify the influence of duration on building portfolio direct economic losses. To this end, a simulation-based probabilistic risk modelling framework is developed for different synthetic building portfolios impacted by a case-study seismic source. Two building typologies, representative of distinct vulnerability classes in southern Europe, are considered. A simulation-based probabilistic seismic hazard analysis is performed, explicitly simulating duration jointly with spectral-shape-related intensity measures. Sets of long and one-to-one spectrally-equivalent short duration ground-motion records are selected and then used jointly to perform nonlinear dynamic analysis and derive fragility models for each considered building typology. Fragility relationships are derived by using average spectral acceleration as the primary intensity measure and: 1) maximum inter-storey drift ratio as a demand parameter, indirectly accounting for ground-motion duration (through the adopted nonlinear modelling strategy); 2) maximum inter-storey drift ratio as demand parameter, explicitly considering duration as an intensity measure together with spectral shape, in a vector-valued format. For each case, vulnerability models are developed by combining the fragility relationships with a building-level damage-to-loss model. The portfolio expected annual losses estimated using the described vulnerability models are critically compared and discussed. Depending on the location/portfolio, the impact of ground-motion duration can be significant, and the proposed approaches allow an analyst to account for it in a practical way.

Type: Proceedings paper
Title: Investigating ground-motion duration effects on building portfolio loss estimates
Event: 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2021)
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: Ground-motion duration; nonlinear dynamic analysis; maximum inter-storey drift ratio; building portfolio loss
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
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/10141881
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