承受局部火灾的结构钢梁的试验研究

Experimental investigation of structural steel beams subjected to localized fire.

作者信息

Ramesh Selvarajah, Choe Lisa, Zhang Chao

机构信息

National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-1070, USA.

出版信息

Eng Struct. 2020 Sep;218. doi: 10.1016/j.engstruct.2020.110844.

DOI:10.1016/j.engstruct.2020.110844

PMID:38846153

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11155475/

Abstract

This paper presents an experimental behavior of unprotected W16 × 26 steel beams subjected to localized fire. Beam specimens were either simply supported or connected to steel columns via all bolted double angle connections. Two test fires, steady or transient heating, were produced using a natural gas fueled burner located below the center of the beams. Thermal and structural responses of the steel beams as well as the heat release rate and applied forces were measured. The tests showed that all specimens failed by lateral-torsional buckling regardless of fire loading and end support conditions. The results highlight that the heating conditions and end restraints influence the behavior of steel beams under localized fire. The experimental results presented can be used for validation of predictive models in order to improve deign methods for localized fire conditions.

摘要

本文介绍了无保护的W16×26钢梁在局部火灾作用下的试验行为。梁试件要么简支，要么通过全螺栓双角钢连接与钢柱相连。使用位于梁中心下方的天然气燃烧器产生了两种试验火灾，即稳态或瞬态加热。测量了钢梁的热响应和结构响应以及热释放率和作用力。试验表明，无论火灾荷载和端部支撑条件如何，所有试件均因弯扭屈曲而破坏。结果突出表明，加热条件和端部约束会影响钢梁在局部火灾下的行为。所呈现的试验结果可用于验证预测模型，以改进局部火灾条件下的设计方法。