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Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames

Aljawhari, K; Gentile, R; Freddi, F; Galasso, C; (2020) Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames. Bulletin of Earthquake Engineering 10.1007/s10518-020-01006-8. (In press). Green open access

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Abstract

This study investigates the efects of ground-motion sequences on fragility and vulnerability of reinforced concrete (RC) moment-resisting frames (MRFs). Two four-storey, fourbay RC MRFs are selected as case studies. These structures, which share the same geometry, are representative of distinct vulnerability classes in the Mediterranean region and are characterized by diferent material properties, cross-section dimensions, and detailing. The frst case study is a ductile MRF designed according to Eurocode 8 (i.e., a special-code frame), while the second is a non-ductile MRF designed to sustain only gravity loads (i.e., a pre-code frame). The infuence of masonry inflls on their seismic performance is also investigated. Advanced numerical models are developed to perform cloud-based sequential nonlinear time history analyses using ground-motion sequences assembled by randomly pairing two real records via Latin hypercube sampling. Diferent structure-specifc damage states are considered to derive fragility curves for the undamaged structures, when subjected to a single ground-motion record, and state-dependent fragility curves by considering the additional damage induced by a second ground-motion record within the sequence. Damage-to-loss models are then used to derive mean vulnerability relationships. Results of the analysis show the importance of considering the efect of damage accumulation in the pre-code frames. Moreover, the presence of inflls shows an overall positive contribution to the seismic performance of both frame types. Vector-valued vulnerability relationships accounting for the damaging efect of two ground-motion records are fnally presented in the form of mean vulnerability surfaces.

Type: Article
Title: Effects of ground-motion sequences on fragility and vulnerability of case-study reinforced concrete frames
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10518-020-01006-8
Publisher version: https://doi.org/10.1007/s10518-020-01006-8
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords: Seismic sequences · Cumulative damage · Conditional fragility curves · Vulnerability relationships · Reinforced concrete frames
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/10116505
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