Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions
Seismic fragility curves, derived from ground motion data, are essential tools for predicting and assessing potential damage to structures during earthquakes. Seismic fragility curves are vital for assessing the structural behavior of buildings and establishing disaster response criteria when an ear...
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MDPI AG
2024-12-01
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| author | Sangki Park Dongwoo Seo Kyusan Jung Jaehwan Kim |
| author_facet | Sangki Park Dongwoo Seo Kyusan Jung Jaehwan Kim |
| author_sort | Sangki Park |
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| description | Seismic fragility curves, derived from ground motion data, are essential tools for predicting and assessing potential damage to structures during earthquakes. Seismic fragility curves are vital for assessing the structural behavior of buildings and establishing disaster response criteria when an earthquake occurs. We performed an incremental dynamic analysis based on 400 ground motion data. We sampled various sets of ground motions (10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, and 350) and derived seismic fragility curves for three performance criteria, based on inter-story drift, by conducting 100,000 simulations for two steel frame structures each (6-story and 13-story). Fewer ground motions increase the uncertainty of the seismic fragility curve, distorting the results. Conversely, increasing the number of ground motions improves the reliability of the input variables and enhances the consistency of the results. The median and the logarithmic standard deviation for both structures converged toward the reference values when 30 or more ground motions were used. Similar results were observed when ≥50 ground motions were used. Specifically, more ground motions corresponded with a lower uncertainty in deriving the input variables for the seismic fragility curve, improving the reliability of the results. In conclusion, the number of ground motions used is directly related to the computational time for numerical analysis when deriving seismic fragility curves. Therefore, considering an appropriate number of ground motions is crucial to enhancing the reliability of the input variables used in evaluating the structural performance. |
| format | Article |
| id | doaj-art-913d58bca2ac4892b0cdea809b8f4f32 |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-913d58bca2ac4892b0cdea809b8f4f322025-08-20T02:00:50ZengMDPI AGApplied Sciences2076-34172024-12-0114241178710.3390/app142411787Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground MotionsSangki Park0Dongwoo Seo1Kyusan Jung2Jaehwan Kim3Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of KoreaDepartment of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of KoreaDepartment of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of KoreaDepartment of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of KoreaSeismic fragility curves, derived from ground motion data, are essential tools for predicting and assessing potential damage to structures during earthquakes. Seismic fragility curves are vital for assessing the structural behavior of buildings and establishing disaster response criteria when an earthquake occurs. We performed an incremental dynamic analysis based on 400 ground motion data. We sampled various sets of ground motions (10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, and 350) and derived seismic fragility curves for three performance criteria, based on inter-story drift, by conducting 100,000 simulations for two steel frame structures each (6-story and 13-story). Fewer ground motions increase the uncertainty of the seismic fragility curve, distorting the results. Conversely, increasing the number of ground motions improves the reliability of the input variables and enhances the consistency of the results. The median and the logarithmic standard deviation for both structures converged toward the reference values when 30 or more ground motions were used. Similar results were observed when ≥50 ground motions were used. Specifically, more ground motions corresponded with a lower uncertainty in deriving the input variables for the seismic fragility curve, improving the reliability of the results. In conclusion, the number of ground motions used is directly related to the computational time for numerical analysis when deriving seismic fragility curves. Therefore, considering an appropriate number of ground motions is crucial to enhancing the reliability of the input variables used in evaluating the structural performance.https://www.mdpi.com/2076-3417/14/24/11787ground motionsseismic fragility curvesearthquake damage |
| spellingShingle | Sangki Park Dongwoo Seo Kyusan Jung Jaehwan Kim Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions Applied Sciences ground motions seismic fragility curves earthquake damage |
| title | Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions |
| title_full | Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions |
| title_fullStr | Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions |
| title_full_unstemmed | Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions |
| title_short | Study on the Uncertainty of Input Variables in Seismic Fragility Curves Based on the Number of Ground Motions |
| title_sort | study on the uncertainty of input variables in seismic fragility curves based on the number of ground motions |
| topic | ground motions seismic fragility curves earthquake damage |
| url | https://www.mdpi.com/2076-3417/14/24/11787 |
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