Author(s): Ahmat Lamko

Abstract: This experimental study investigates the thermal performance of hollow steel sections (HSS) subjected to high-temperature conditions, such as those encountered during fire incidents. The research focuses on assessing changes in mechanical properties, thermal conductivity, and structural integrity under various temperature regimes. Hollow steel sections of varying geometries were tested in a controlled high-temperature environment, and key performance indicators, such as yield strength, ultimate load capacity, and thermal expansion, were analyzed. Results show a significant decline in strength and stiffness beyond 600 °C, along with notable thermal buckling behavior. These findings contribute to understanding the fire-resistance properties of hollow steel structures and provide recommendations for fire-safe design in construction.

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