Reliability Assessment of Steel and Composite Beam in Localized Fire: Load and Resistance Factor Design Framework

IF 2.4 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY

Fire Technology Pub Date : 2025-12-24 DOI:10.1007/s10694-025-01830-x

Sabarna Palit, Sriman Kumar Bhattacharyya, Damodar Maity

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引用次数: 0

Abstract

Steel members in open areas like parking lots and bridges are vulnerable to localized fire. The use of fire-protection measures may slow the rate of temperature rise in such cases. However, due to uncertainty in the mechanical and thermal properties of the members and fire-protective systems, quantitative assessment of the safety of the members considering these uncertainties is necessary. The present paper describes a load and resistance factor design (LRFD)-based framework to evaluate the safety of steel and composite beams exposed to localized fire. The reliability index of the beams is calibrated with the partial safety factors of parameters such as beam strength, fuel load and thermal properties of fire-protection material and correspondingly, empirical relations are developed to define their relationship. For composite beam, it was concluded that the reliability indices were marginally sensitive to the safety factors of material strength of concrete slab and majorly depended on the safety factors of material strength of steel beam.

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局部火灾中钢和组合梁的可靠性评估：荷载和阻力系数设计框架

停车场和桥梁等开放区域的钢构件容易受到局部火灾的影响。在这种情况下，采取防火措施可以减缓温度上升的速度。然而，由于构件和防火系统的力学和热性能的不确定性，考虑这些不确定性的构件的安全性定量评估是必要的。本文介绍了一种基于荷载和阻力系数设计（LRFD）的框架，以评估钢和组合梁在局部火灾下的安全性。用梁强度、燃料负荷、防火材料热性能等参数的部分安全系数对梁的可靠度指标进行了标定，并建立了相应的经验关系式来确定它们之间的关系。对于组合梁，其可靠度指标对混凝土板材料强度安全系数较为敏感，而主要依赖于钢梁材料强度安全系数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.