Influence of fire severity and concrete properties on the thermo‐hygral behavior of concrete during fire exposure

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-08-14 DOI:10.1002/suco.202400067

Umang Pulkit, Satadru Das Adhikary, Venkatesh Kodur

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Abstract

Since the world is transitioning toward performance based design, the study of thermo‐hygral behavior of concrete when subjected to real fire becomes crucial. Fire accidents have revealed that nominal fire curves cannot be applied because of varying severity of real fire. In 2008, traveling fire concept was developed in which severity is dependent on heat release rate and fire size. This study explores the effect of fire severity and other concrete properties like strength, aggregate type, and relative humidity. The proposed model has been developed by combining the principles of mechanics and thermodynamics and upon validation with the experimental results, a reasonable agreement has been observed. It can be concluded that severity of fire is directly related to thermo‐hygral behavior of concrete. On the other hand, this study also highlights the influence of type of aggregate and moisture content in addition to the traditional variables like volume fraction of solid and permeability. On studying the influence of type of aggregate, it can be concluded that recycled aggregate concrete performed better than conventional concrete. The integration of proposed model in the performance based design is a leap toward development of resilient structure subjected to dynamic fire conditions.

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火灾严重程度和混凝土特性对火灾期间混凝土热息行为的影响

由于全球正在向基于性能的设计过渡，因此研究混凝土在实际火灾中的热热力行为变得至关重要。火灾事故表明，由于真实火灾的严重程度不同，因此无法采用名义火灾曲线。2008 年，提出了行火概念，其严重程度取决于热释放率和火灾规模。本研究探讨了火灾严重程度和其他混凝土特性（如强度、骨料类型和相对湿度）的影响。结合力学和热力学原理建立了拟议模型，并与实验结果进行了验证，发现两者之间存在合理的一致性。由此可以得出结论，火灾的严重程度与混凝土的热函行为直接相关。另一方面，除了固体体积分数和渗透性等传统变量外，本研究还强调了骨料类型和含水量的影响。通过研究骨料类型的影响，可以得出结论：再生骨料混凝土的性能优于传统混凝土。在基于性能的设计中整合所提出的模型，是朝着开发受动态火灾条件影响的弹性结构迈出的一大步。

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

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.