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Steel and Composite Structures Volume 39, Number 3, May10 2021 , pages 243-259 DOI: https://doi.org/10.12989/scs.2021.39.3.243 |
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The accuracy of fragility curves of the steel moment-resisting frames and SDOF systems |
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Saman Yaghmaei-Sabegh, Ali Jafari and Mahdi Eghbali
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| Abstract | ||
| In the present paper, a Monte Carlo-based framework is developed to investigate the accuracy and reliability of analytical fragility curves of steel moment-resisting frames and simple SDOF systems. It is also studied how the effectiveness of incremental dynamic analysis (IDA) and multiple stripes analysis (MSA) approaches, as two common nonlinear dynamic analysis methods, are influenced by the number of records and analysis stripes in fragility curves producing. Results showed that the simple SDOF systems do not provide accurate and reliable fragility curves compared with realistic steel moment-resisting structures. It is demonstrated that, the effectiveness of nonlinear dynamic analysis approaches is dependent on the fundamental period of structures, where in short-period structures, IDA is found to be more effective approach compared with MSA. This difference between the effectiveness of two analysis approaches decreases as the fundamental period of structures become longer. Using of 2 or 3 analysis stripes in MSA approach leads to significant inaccuracy and unreliability in the estimated fragility curves. Additionally, 15 number of ground motion records is recommended as a threshold of significant unreliability in estimated fragility curves, constructed by MSA. | ||
| Key Words | ||
| Monte Carlo simulations; fragility curves; steel moment-resisting frames; SDOF systems; incremental dynamic analysis; multiple stripes analysis; effectiveness; accuracy; reliability | ||
| Address | ||
| Saman Yaghmaei-Sabegh and Ali Jafari: Department of Civil Engineering, University of Tabriz, Tabriz, Iran Mahdi Eghbali: Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran | ||