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標題: | 隔震建築耐震風險簡易評估方法研究(二) Developing a Simplified Seismic Risk Assessment Approach for Base-Isolated Buildings (II) |
作者: | 張巧蓉 Qiao-Rong Zhang |
指導教授: | 黃尹男 Yin-Nan Huang |
關鍵字: | 隔震建物,耐震性能評估,地震危害度,非線性歷時分析,鉛心橡膠隔震支承墊,易損性曲線, Seismic isolated building,Seismic performance assessment,Seismic hazard,Nonlinear response history analysis,Lead rubber bearing,Fragility curve, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 美國聯邦緊急事務管理局出版之房屋結構耐震性能評估準則FEMA P-58(2018),為一套針對固定基礎結構建立之機率式耐震性能評估法,提出三種以地震強度定義方式區分之性能評估方式,其中基於地震危害度的耐震性能評估方法,考慮不同地震強度對結構之危害,而該評估準則亦提供選取地震強度分析範圍與等級數量之建議。然而針對現今逐漸普遍之隔震建物,其耐震性能評估亦日趨重要,而由於隔震建物之耐震能力較高,故於考慮地震危害之情況下,該準則所建議的地震強度範圍是否可合理評估隔震建物之耐震性能,尚待更進一步之討論與研究。
本研究以兩棟鉛心橡膠隔震系統之鋼筋混凝土造隔震建物進行非線性歷時分析求取結構反應,並採用FEMA P-58(2018)基於地震危害度的耐震性能評估方法,探討該準則建議之地震強度範圍是否適用於隔震建物。結果顯示該準則建議之地震強度範圍由於範圍過窄,使得隔震建物失效風險被大幅低估。因此,本研究建立一套簡易風險推估法,可快速推估隔震建物失效風險,並於進行基於地震危害度的耐震性能評估時,提供選取地震強度範圍之建議,使得評估時可考慮對隔震建物失效風險有影響之地震,並有效減少較無影響的地震,如此便可於確保隔震建物耐震風險評估之準確性下降低執行分析之成本。 簡易風險推估法之流程大致分為五大步驟:(1) 定義地震強度範圍,藉由本研究建議之方法選取合適之地震強度範圍上下界與分段數量;(2) 推估結構反應分布,包含隔震層最大剪應變與上部結構最大層間變位角;(3) 計算個別元件失效機率,搭配元件易損性曲線以一階二次矩估算元件失效機率;(4) 求取系統失效機率,以系統可靠度分析方法考慮隔震層與上部結構之破壞模式,計算系統失效機率;(5) 推估失效風險,將系統失效機率結合地震危害度曲線,求得隔震建物的失效風險。 The Federal Emergency Management Agency of the United States published the second edition of Seismic Performance Assessment of Buildings (FEMA P-58) in 2018. FEMA P-58 is a probabilistic seismic performance assessment for fixed-base buildings, and provides a set of performance assessment methods. For the time-based assessment, considers the damage to the buildings caused by all possible earthquakes under different intensities. It provides suggestions for selecting the analysis scope of the seismic intensity and the number of levels in the code. However, for the seismic isolated building, which is generally applied to structures recently, the seismic performance assessment for the seismic isolated building is becoming more and more important. Since the seismic isolated building with a high seismic capacity, in time-based assessment, whether the seismic intensity scope suggested by the code can reasonably evaluate the seismic performance of the seismic isolated building, further discussion and research are needed. In this research, it takes two reinforced concrete isolated buildings with lead-rubber bearings to obtain the structural response by nonlinear response history analysis, and discussing the applicability of FEMA P-58 (2018) on these seismic isolated buildings. According to the results, the analysis scope of the seismic intensity defined by the code is not enough for isolated buildings, which greatly underestimates the seismic risk of isolated buildings. Therefore, this research develops a simplified seismic risk analysis for isolated buildings to quickly estimate the seismic risk of seismic isolated buildings, and provides suggestions for selecting the scope of seismic intensity in time-based assessment. It enables the assessment to consider ground motions that have an impact on the seismic risk of seismic isolated buildings, and effectively reduces the less impactful earthquakes. In this way, the cost of performing analysis can be reduced while ensuring the accuracy of seismic risk assessment of seismic isolated buildings. The process of simplified seismic risk analysis includes five steps: (1) Define the scope of seismic intensity, and select the appropriate upper and lower bounds of the scope of seismic intensity and the number of segments by the method suggested in this research; (2) Estimate the distribution of structural response distribution, including the maximum shear strain of the isolation layer and the maximum story drift of the superstructure; (3) Calculate the failure probability of individual structural component by using the first-order-second-moment reliability approach to estimate the failure probability of components with the fragility curve of the structural component; (4) Calculate the failure probability of the system by considering the failure mode of the isolation layer and the superstructure with the system reliability analysis method; (5) Estimate the failure risk by combining the system failure probability with the seismic hazard curve to obtain the failure risk of the seismic isolated buildings. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88912 |
DOI: | 10.6342/NTU202302701 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 土木工程學系 |
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