Fire Performance of HSS Steel Connections

背景：火灾会导致温度升高，对建筑构件和 系统。钢结构节点是任何钢结构的重要组成部分。来自火灾的观察 确认连接因其作用而对结构构件的存活时间有相当大的影响 在分配兵力方面。众所周知，空心钢型材吸收热能的速度比厚钢型钢高 钢材，导致较早的屈服发生。在火灾事件中，受约束的钢梁可以迅速升温并 对支撑柱造成横向推力。柱子很可能因为这种推力而失败，而不是 必然是因为气温升高。 目标：拟议的研究旨在检查和评估在火灾条件下， 现有的HSS-TO-HSS扩展端板弯矩连接，并努力引入新的连接 能够吸收或者改变侧向推力的方向。 科学方法：利用中型和全尺寸实验，目前和建议的表现 将评估火灾条件下HSS到HSS的扩展端板弯矩连接。建议数 研究的重点是如何在火灾中利用接触网的作用来改善其火灾性能。 约束钢梁。采用ABAQUS有限元模型分析了热力耦合效应和热力耦合效应。 结构性能。设计性火灾(针对商业和工业类型的占用)以及标准火灾 时间-温度分布将应用于使用卡尔顿新建消防设施的连接 大学的。 这项研究有望促进对常用钢材着火行为的理解 连接(而不是隔离连接)，并提出一种高级连接，该连接可以增强 火灾事件。根据计算结果，提出了梁柱抗火设计方法。 关系。

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