ABSTRACT A risk-based robustness assessment approach of a steel frame structure affected by unforeseen events is developed. The approach quantifies both the failure consequence index and failure probability index and assesses the structural robustness of real steel frame structures. The separateness is used as the failure consequence index and determined by identifying the key components and possible collapse modes of the damage structure via a structural vulnerability analysis. The failure probability index is determined based on a hazard collapse potential, which is used to create the collapse probability-hazard collapse potential (P-H) fragility function. Then, the collapse probability of the damage structure is obtained by substituting the most disadvantageous hazard collapse potential into the P-H fragility function. The proposed approach is used to assess the structural robustness of a 4-story steel frame structure subjected to unforeseen events. The results show that the separateness quantifies the transformational relationship of the failure consequence index in the failure process, and the collapse mode of the damage structure with the largest hazard collapse potential is most likely to occur. The robustness results produced from the proposed approach are consistent with the conceptual results of structural mechanics, thus the validity of the approach is demonstrated.

中文翻译：

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基于风险的钢框架结构对不可预见事件的稳健性评估

摘要 开发了一种受不可预见事件影响的钢框架结构的基于风险的稳健性评估方法。该方法量化了失效后果指数和失效概率指数，并评估了真实钢框架结构的结构坚固性。分离度被用作失效后果指标，通过结构脆弱性分析识别损坏结构的关键部件和可能的倒塌模式来确定。失效概率指数是基于危险崩溃潜力确定的，用于创建崩溃概率-危险崩溃潜力 (PH) 脆弱性函数。然后，将最不利的危险倒塌潜力代入PH脆性函数，得到破坏结构的倒塌概率。所提出的方法用于评估遭受不可预见事件的 4 层钢框架结构的结构坚固性。结果表明，分离度量化了破坏过程中破坏后果指标的转化关系，最有可能发生倒塌风险最大的破坏结构的倒塌模式。所提出的方法产生的稳健性结果与结构力学的概念结果一致，从而证明了该方法的有效性。且具有最大危险倒塌潜力的破坏结构的倒塌模式最有可能发生。所提出的方法产生的稳健性结果与结构力学的概念结果一致，从而证明了该方法的有效性。且具有最大危险倒塌潜力的破坏结构的倒塌模式最有可能发生。所提出的方法产生的稳健性结果与结构力学的概念结果一致，从而证明了该方法的有效性。