Fan-Qin Meng, G Charles Clifton, Anthony Abu, James Lim
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引用次数: 0
Abstract
A simple design method typically applies a Fire Resistance Rating (FRR) to structural components in isolation based on their performance in the fire test. This approach naturally assumes that the interaction between these components does not degrade their fire performance. To assess the reliability of this assumption, this paper numerically investigated the fire performance of continuous steel columns, incorporating the effects coming from connected steel beams and composite slabs. A 3-step numerical validation, using ABAQUS and following a recommended general simulation process, confirmed the numerical model's accuracy for this research through agreement with experimental tests. The simulation results founded that the well-designed interior column subassemblage, T4-90, failed to reach the designed FRR. This is due to compression coming from the continuous bending beam through the beam bottom flange, significantly weakening the column performance. Rib stiffeners between column flanges are proposed to enhance resistance to contact forces from beam flanges during severe fires. However, the simulation found that the steel columns with rib stiffeners might fail immediately after reaching the FRR. Thus, this research introduced the concept of 'reserve fire resistance' (authentic fire resistance to FRR) to evaluate structural steel elements' resilience to fires exceeding the specified FRR, aligning with the concept of reserve capacity of structural resilience to earthquakes. Based on this concept, new limiting temperature design equations were proposed and validated for steel columns derived from their performance, which yielded an average reserve fire resistance of 1.30 herein.
期刊介绍:
Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis.
The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large.
It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.