Fire Performance of HSS Steel Connections

高速钢钢连接件的防火性能

• 批准号: 371673-2013
• 负责人: Zalok, Ehab
• 金额: $ 1.53万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636109
• 关键词: Fire; Performance; HSS; Steel; Connections

Background: Fires can cause elevated temperature that can have adverse impact on the building elements andsystems. Steel connections are vital and essential components of any steel structure. Observations from firesconfirm that connections have considerable effect on the survival time of structural members due to their rolein distributing forces. Hollow Steel Sections HSS are known to absorb heat energy at higher rates than thicksteel sections, causing earlier yielding to occur. In a fire event, restrained steel beams can heat up quickly andcause lateral thrust on supporting columns. It is likely that columns fail because of this thrust, and notnecessarily because of the elevated temperatures.Objectives: The proposed research aims to examine and evaluate, under fire conditions, the performance ofexisting HSS-to-HSS extended end-plate moment connections and work towards introducing a new connectioncapable of absorbing or redirecting the lateral thrust.Scientific approach: Using medium- and full-scale experiments, the performance of current and proposedHSS-to-HSS extended end-plate moment connections in fire conditions will be assessed. The proposedresearch focuses on how to utilize the catenary action in fire in order to improve the fire performance ofrestrained steel beams. ABAQUS finite element model will be used to analyze the couple effect of thermal andstructural performance. Both design fires (for commercial and industrial type occupancies) as well as standardtime-temperature profiles will be applied to the connections using a newly constructed fire facility at CarletonUniversity's.The research is expected to advance the understanding of fire behaviour of the commonly used steelconnections (not isolated connections), and propose an advanced connection that can enhance the stability inthe event of fire. The results will be used to produce a fire resistance design method of beam-to-columnconnections.

背景：火灾会导致温度升高，对建筑构件和系统产生不利影响。钢连接件是任何钢结构的重要组成部分。火灾观测表明，由于连接件的受力分布作用，连接件对结构构件的生存时间有很大影响。已知中空型钢HSS吸收热能的速率高于厚型钢，导致早期屈服。在火灾中，受约束的钢梁会迅速升温，并对支撑柱产生侧向推力。这是可能的，列失败，因为这个推力，而不一定是因为升高的温度。目的：拟议的研究旨在检查和评估，在火灾条件下，现有的HSS-到-HSS扩展端板力矩连接的性能，并致力于引入一种新的连接能够吸收或重定向侧向推力。科学方法：使用中型和全尺寸试验，评估当前和建议的HSS-到-HSS扩展端板弯矩连接在火灾条件下的性能。本文主要研究如何利用火灾中的悬链线作用来提高约束钢梁的抗火性能。采用ABAQUS有限元模型分析热-结构耦合效应.两个设计火灾（商业和工业类型的职业），以及standardtime-temperature profile将应用于连接使用新建的消防设施在卡尔顿大学的。研究预计将推进火灾行为的理解常用的钢连接（不是孤立的连接），并提出了一种先进的连接，可以提高火灾时的稳定性。研究结果将用于梁柱节点的抗火设计方法。