Abstract Traditional prescriptive requirements for structural fire design do not explicitly ensure the load bearing capacity of the structure up to and including burnout. Therefore, a deterministic design method is presented, which enables to perform a quick check of the burnout bending resistance of a concrete slab exposed to a natural fire, and allows for the evaluation of (delayed) bending failure that can occur during or after the cooling phase, that would otherwise remain undetected. Subsequently, the influence of the inherent uncertainties associated with material properties and geometry on the design until full burnout is investigated. Reference fragility curves are presented and subsequently a global resistance factor (GRF) safety format for the fire design considering complete burnout scenarios is proposed. Application of the determined GRF allows for an explicit reliability-based design for fire exposed concrete slabs, without requiring the application of full-probabilistic methods. The concept is applied to simply supported reinforced concrete slabs and the calculated values are applicable to any compartment within the Eurocode parametric fire framework, through application of a scaling approach. The methods proposed in this contribution are intended as a stepping stone towards the development of GRF-based safety formats for more complex geometries and advanced numerical tools.

中文翻译：

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混凝土板的耐烧毁性：概率评估和全局阻力系数校准

摘要 传统的结构防火设计规范性要求没有明确保证结构的承载能力，直至烧毁。因此，提出了一种确定性设计方法，该方法能够快速检查暴露在自然火灾中的混凝土板的抗烧坏抗弯性，并允许评估冷却期间或之后可能发生的（延迟）弯曲失效阶段，否则将不会被发现。随后，研究了与材料特性和几何形状相关的固有不确定性对设计的影响，直到完全燃尽。介绍了参考脆性曲线，随后提出了考虑完全燃尽情况的火灾设计的全局阻力系数 (GRF) 安全格式。确定的 GRF 的应用允许对火灾暴露的混凝土板进行明确的基于可靠性的设计，而无需应用全概率方法。该概念适用于简支钢筋混凝土板，通过应用缩放方法，计算值适用于欧洲规范参数防火框架内的任何隔间。本贡献中提出的方法旨在作为为更复杂的几何形状和高级数值工具开发基于 GRF 的安全格式的垫脚石。该概念适用于简支钢筋混凝土板，通过应用缩放方法，计算值适用于欧洲规范参数防火框架内的任何隔间。本贡献中提出的方法旨在作为为更复杂的几何形状和高级数值工具开发基于 GRF 的安全格式的垫脚石。该概念适用于简支钢筋混凝土板，通过应用缩放方法，计算值适用于欧洲规范参数防火框架内的任何隔间。本贡献中提出的方法旨在作为为更复杂的几何形状和高级数值工具开发基于 GRF 的安全格式的垫脚石。