| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 90 === The purpose of this research is to simulate the behavior of steel within real structure in fire. This research can be divided into four parts: macroscopic behavior, fire-resistant property of post-fire steel, analysis of the cross-section of fracture and SEM microscopic structure analysis. The main variables for this study are the stress sustained of steel and the fire temperature. 0.4fy, 0.6fy, 0.8fy, 1.05fy and 1.10fy will be applied to simulate the real stress sustained in real structure. As for the fire temperature, 200℃, 300℃, 400℃, 500℃ and 600℃are used as variables.
The study results show that the heavier the stress sustained of steel and the higher the temperature, the bigger the maximum strain and strain remain. And when the combination of stress and temperature reach a limit, the steel will fracture. But the fractured mode is not due to the inter-granular rupture of creep but the dimpled rupture of stress overload. Because the fractured deformation is quite small, the dimple in microscopic structure is small and shallow. Besides, for the fire-resistant property of post-fire steel, the study shows that the characteristic of the post-fire steel doesn’t weaken through a fire.
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