الفهرس 
Literature Review About the Elevated TemperatureOnly 14 pages are availabe for public view
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Abstract
One of the primary structural components of concrete structures is the columns since they serve as the primary support for other load-bearing components like beams and slabs. Their failure during a fire could compromise the stability of the rest of the building. Self-compacting concrete (SCC) is an innovative and promising retrofitting technique that can influx under its weight in very high reinforcement.
This work aims to examine the effectiveness of using steel fiber-reinforced self-compacting concrete (SFRSCC) jackets in retrofitting RC columns subjected to high temperatures. In order to do that, fifteen RC columns were cast and tested under axial loading. One column served as an unheated control column, and fourteen columns were heated to 400 ℃ and 600 ℃ for two hours. Subsequently, twelve columns were retrofitted using SFRSCC jackets. The volume fraction of steel fibers (0%, 0.5% and 1.5%) and the thickness of the SFRSCC jackets (25mm and 50mm) were the main parameters considered for the retrofitting technique. According to the experimental results, SFRSCC jackets can significantly enhance the structural performance of post-heated columns as evaluated by failure load, stiffness, and toughness. The percentage of increase in the failure load, stiffness and toughness of retrofitted post-heated columns is greatly impacted by the thickness of the SFRSCC jackets. The retrofitted columns with 25 mm and 50 mm SFRSCC jackets increased their failure load by 63.9% and 211.8%, respectively, relative to that of the heated control column at 600 ◦C. It is obvious that the failure load of the retrofitted columns was not significantly impacted by increasing the volume fraction of steel fiber in the SFRSCC jackets. In general, adding steel fiber to SFRSCC jackets is more effective at improving stiffness.
Finally, a proposed design equation was suggested to predict the failure load of retrofitted post-heated columns with SFRSCC jackets. The design equations provided dependable and reliable conformity with the experimental results and can be applied to predict the failure load of retrofitted post-heated columns with SFRSCC jackets.