Abstract
This paper presents the probabilistic seismic demand and fragility analyses of a novel mid-rise large-span cassette structure. A newly designed nine-storey office building in Hunan, China, is selected, and its two different design schemes, namely, a traditional frame structure and a novel cassette structure, are examined using numerical models established on the basis of a shake table test. Based on probabilistic seismic theory, the appropriate intensity measures are firstly studied based on a set of 110 seismic records; and PGV and GeoSaavg, which consider the 3D characteristics of the structure, are selected. In addition, the uncertainty of earthquakes, including spectral characteristics, fault distance and input direction, are considered, and 25 seismic records recommended by the Federal Emergency Management Agency are selected. An incident angle interval of 22.5° is selected to consider the uncertainty in the input directions of real earthquakes. Incremental dynamic analyses are conducted, and the structural responses in every individual input direction as well as in all the directions are studied. Finally, probabilistic seismic fragility analysis is conducted, and the probabilities of exceeding different limit states of the frame and cassette structures is presented. Amongst the studies, the novel cassette design can not only achieve much larger span, but also shows a better, more stable seismic performance. Therefore, the cassette structure may be a better alternative in seismic design.
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Acknowledgements
The authors greatly appreciate financial support from the National Natural Science Foundation of China (Grant Numbers 51838004, 51525801 and 51708106) and the Natural Science Foundation of Jiangsu Province (Grant Number BK20170680).
Funding
The research is supported by the National Natural Science Foundation of China (Grant Nos. 51838004, 51525801 and 51708106) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20170680).
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Z-PC: Methodology, investigation, data curation, conceptualization, writing—original draft; D-CF: project administration; X-YC: data collecting; K-JM: investigation, supervision; SZ: writing—review and editing; GW: validation, resources.
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Chen, ZP., Feng, DC., Cao, XY. et al. Probabilistic seismic demand and fragility analysis of a novel mid-rise large-span cassette structure. Bull Earthquake Eng 20, 383–413 (2022). https://doi.org/10.1007/s10518-021-01222-w
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DOI: https://doi.org/10.1007/s10518-021-01222-w