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A comparative study on seismic fragility analysis of RC frame structures with consideration of modeling uncertainty under far-field and near-field ground motion excitation

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Abstract

Based on the first-order second-moment method, a comparative study on seismic fragility analysis with consideration of modeling uncertainty is carried out for a 12-story reinforced concrete frame structure under excitation with far-field and pulse-like near-field ground motions by using the multiple stripes analysis method. The sensitivity of the median fragility capacity of the building to fourteen parameters in the cases of three limit states (i.e., immediate occupancy, life safety, and collapse prevention) is analysed, and the effect of the selection of ground motion intensity measures on the determination of modeling uncertainty is investigated. Finally, the annual probabilities of exceeding each limit state with different confidence levels are calculated, and two methods, the mean estimates approach and the confidence interval method, are used to incorporate uncertainties. The results show that the characteristics of ground motions affect the sensitivity of the median capacity to the disturbance of structural parameters. The modeling uncertainty estimated in the near-field records is meaningfully less than that in the far-field records. Judging from this limited case study, the modeling uncertainty estimated may be underestimated by using an inefficient IM. The influence of the modeling uncertainty in the fragility analysis for each limit state cannot be ignored when using the confidence interval method.

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Funding

This research was financially supported by the Jiangsu Youth Fund Projects (BK20210371), the National Natural Science Foundation of China (52108457 and 52108133), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJB560014, 18KJB560010 and 19KJB560017), Fundamental Research Funds for the Central Universities (B210201019), High-level Talent Research Fund of Nanjing Forestry University (163050115), Nanjing Forestry University Undergraduate Innovation Training Program (2021NFUSPITP0221, 2020NFUSPITP0352 and 2020NFUSPITP0373), and Jiangsu Undergraduate Innovation Training Program (202110298079Y).

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YZ: Investigation, formal analysis, writing—original draft; XO: data processing, picture production, writing—response; BS: validation, formal analysis, writing—review and editing; YS: writing—review & editing, methodology; ZW: design, modeling, writing—review and editing.

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Correspondence to Yantai Zhang.

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Zhang, Y., Ouyang, X., Sun, B. et al. A comparative study on seismic fragility analysis of RC frame structures with consideration of modeling uncertainty under far-field and near-field ground motion excitation. Bull Earthquake Eng 20, 1455–1487 (2022). https://doi.org/10.1007/s10518-021-01254-2

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  • DOI: https://doi.org/10.1007/s10518-021-01254-2

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