2023 Fiscal Year Research-status Report
Rapid evaluation of structural soundness of steel frames using a coupling coefficient (CC)-based method
| Project/Area Number |
22KF0221
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| Allocation Type | Multi-year Fund |
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| Research Institution | Kyoto University |
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Principal Investigator |
倉田 真宏 京都大学, 防災研究所, 准教授 (70624592)
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| Co-Investigator(Kenkyū-buntansha) |
SHEN SHAODONG 京都大学, 防災研究所, 外国人特別研究員
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| Project Period (FY) |
2023-03-08 – 2025-03-31
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| Keywords | 鉄骨建物 / 健全性評価 / ひずみ計測 |
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| Outline of Annual Research Achievements |
The proposed the coupling coefficient (CC) method provides a mean to evaluate the structural soundness of buildings immediately after an earthquake. This year, the influence of concentrated damage on column bases were formulated by modifing the original CC methods with known force demands at the first story columns.The force demands are assumed to be obtained by strain gauge data of the columns in thebottom storey.The modified CC provides information to classify the degree of damage by estimating the residual capacity of the MRF (moment-resisting frames) and predict the future seismic response under hypothetical earthquakes. Finite element analyses were conducted to validate the proposed method. Further, the limit values of CC were obtained by solving the deduced equations. The degree of damage was classified according to these limit values. The equations showed an accuracy of 87 % based on the analysis results. The method was also applied to the dataset of a four-storey MRF tested at the E-Defense shaking table facility for evaluating the accuracy.The CC exhibited an upward trend in general for huge quakes, with successively increasing degrees of damage to the ECBs during earthquakes, with some fluctuations. The dispersion of CC was caused by the diversity of the hysteresis path.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The scheduled research tasks were accomplished and the obtained outcomes were published in one of the top international journal.
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| Strategy for Future Research Activity |
The next year will focus on the threshold evaluation for structural integrity assessment using the proposed CC and modified CC methods.To analyize the relationship between CC values and the extent of structural and nonstructural damage,a supervised learning model will be explorered and the sensitivity analysis will be conducted to prepare a large dataset.
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| Causes of Carryover |
The research trip originally scheduled in February, 2023 was canceled due to unforeseen personal issue of the primary investigator. Thus, the budget allocated for the trip remained.
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