Performance of Cellular Composite Floor Beams under Severe Fire Conditions

蜂窝复合材料楼梁在严重火灾条件下的性能

• 批准号: EP/F001525/1
• 负责人: Ali Nadjai
• 金额: $ 51.58万
• 依托单位: University of Ulster
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF001525%2F1
• 关键词: Performance; Cellular; Composite; Floor; Beams

Despite the current popularity of long-span composite flooring systems, the current structural fire engineering design codes EC3/4 Part 1.2 and BS5950 Part 8 do not contain rules or guidance on the fire resistance of composite floors employing cellular steel beams. The purpose of this project is to investigate the performance and failure mechanisms of full-scale composite cellular floor beams at elevated temperatures over a range of spans, including the influence of both flexure and shear, alone and in combination. Emphasis will also be placed on examining the development and influence of the additional compression forces caused by axial restraint to thermal expansion ensuing from the surrounding structure when a beam is heated in a fire. The proposed research is based on a programme of physical model fire tests at Ulster, to provide a wealth of data which will greatly enhance the level of understanding of behaviour of composite cellular steel beams in fire. This approach will be extended and enhanced by the integration of computer modelling with the testing, initially for validation and rationalisation of the behaviour, but leading to an extensive parametric study aimed at developing a design methodology for such members in fire. The availability of sound design guidance on composite floors using steel CBs exposed to fire would make it possible to calculate fire protection requirements on a rational and trustworthy basis which does not exist at present, and would lead to possible worldwide export opportunities for UK consultants and fabricators.

尽管大跨度复合地板系统目前很流行，但现行的结构消防工程设计规范EC3/4第1.2部分和BS5950第8部分并未包含关于采用蜂窝钢梁的复合地板的耐火性的规则或指南。该项目的目的是研究全尺寸复合材料蜂窝楼板梁在一定跨度范围内的高温下的性能和失效机制，包括单独和组合的弯曲和剪切的影响。重点还将放在检查当梁在火中加热时，由周围结构引起的热膨胀的轴向约束所引起的附加压缩力的发展和影响。拟议的研究基于阿尔斯特的物理模型火灾测试计划，提供丰富的数据，这将大大提高对复合材料蜂窝钢梁在火灾中行为的理解水平。这种方法将通过计算机建模与测试的集成来扩展和增强，最初是为了验证和合理化行为，但最终会进行广泛的参数研究，旨在为火灾中的此类构件开发设计方法。使用暴露于火中的钢制CB的复合地板的健全设计指南的可用性将使在目前尚不存在的合理且值得信赖的基础上计算防火要求成为可能，并且将为英国顾问和制造商带来可能的全球出口机会。

项目成果

Performance of unprotected and protected cellular beams in fire conditions

无保护和受保护蜂窝梁在火灾条件下的性能

• DOI: 10.1016/j.conbuildmat.2015.12.150
• 发表时间: 2016
• 期刊: Construction and Building Materials
• 影响因子: 7.4
• 作者: Nadjai A