| Summary: | Cellular stainless-steel beams (CSSBs) are becoming increasingly popular in building applications due to their superior corrosion resistance and mechanical properties. However, there are no specific design criteria for CSSBs, and it is unclear how different thicknesses of CSSBs behave in the event of a fire. In this research, we investigate the effect of section thickness on the behaviour of CSSBs in a fire and under applied loading. Finite element analysis were performed using ABAQUS CAE software and the model were validated using data from previous experimental studies. From the numerical simulation output, it was revealed that the thinner web thickness of CSSBs fails first at the beginning of fire exposure, while the thicker flange thickness is able to sustain higher strength and stiffness when it fails first during fire exposure and applied loading execution. Additionally, a thicker section of CSSB can dissipate heat uniformly, which is faster than a thinner section. These results highlight the importance of considering section thickness in CSSB design and provide insight into the behaviour of CSSBs in high-temperature environments. It was demonstrated that the compatibility of the current design standards with finite element analysis. © School of Engineering, Taylor’s University.
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