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Fragility assessment of a RC structure under tsunami actions via nonlinear static and dynamic analyses

Petrone, C; Rossetto, T; Goda, K; (2017) Fragility assessment of a RC structure under tsunami actions via nonlinear static and dynamic analyses. Engineering Structures , 136 pp. 36-53. 10.1016/j.engstruct.2017.01.013. Green open access

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Abstract

Current guidelines for design and assessment of buildings under tsunami actions do not explicitly state how to apply tsunami loads to buildings and which analysis methods to use in order to assess the structural response to the tsunami loads. In this paper, a reinforced concrete (RC) moment-resisting frame, which is designed as a tsunami evacuation building, is selected as a case study and subjected to simulated 2011 Tohoku tsunami waves. To assess tsunami impact on the model building, different nonlinear static analyses, i.e. constant-height pushover (CHPO) and variable-height pushover (VHPO), are compared with nonlinear dynamic analysis. The results of VHPO provide a good prediction of engineering demand parameters and collapse fragility curves obtained from the dynamic analysis under a wide range of tsunami loading. On the other hand, CHPO tends to overestimate interstorey drift ratio (IDR) and underestimate column shear by about 5–20%. It provides a larger fragility, i.e. about 10% in median value, for global failure and a smaller fragility for local shear failure. On the basis of these results, it is recommended that VHPO be used in future fragility analysis of buildings subjected to tsunami. However, pushover methods might not be adequate in cases where the tsunami inundation force time-histories are characterised by a “double-peak”, which subjects the structure to a two-cycle load. Finally, it is found that tsunami peak force is better correlated to IDR than flow velocity and inundation depth for the considered structure. This suggests that the peak force would be a more efficient intensity measure than the other two in the development of tsunami fragility curves.

Type: Article
Title: Fragility assessment of a RC structure under tsunami actions via nonlinear static and dynamic analyses
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.engstruct.2017.01.013
Publisher version: http://dx.doi.org/10.1016/j.engstruct.2017.01.013
Additional information: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Technology, Engineering, Civil, Engineering, Tsunami engineering, Fragility curve, Analysis methodology, Pushover analysis, Time-history analysis, Tsunami force, Tsunami simulation, REINFORCED-CONCRETE MEMBERS, 2011 TOHOKU EARTHQUAKE, MODEL, CURVES, JAPAN, SPACE, SHEAR, FLOW
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1537015
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