Ultimate limit-state design of textile-reinforced concrete folded floor panels

Purpose of reseach. The main goal of this study is to evaluate the effectiveness of using non-metallic meshes made of high-strength fibres in the reinforcement of folded elements. For this purpose, methods for calculating folded structures made of concrete composites are investigated, and a comparative calculation of the structure with various reinforcement parameters is performed. Methods. The study analyzes an algorithm for calculating reinforced cement structures using the limit force method with the transition from the original folded section to the reduced section. Using the method under study, we calculated a thin folded panel reinforced with meshes of various materials with a constant mesh reinforcement coefficient. Welded steel mesh, high-strength glass fiber textile mesh and carbon fiber textile mesh were considered as reinforcement. Simultaneously, the inverse problem was solved, within the framework of which the reinforcement coefficient necessary to ensure the same load-bearing capacity of the section when using different reinforcing materials was selected. Results. Sample of section reinforced with carbon fiber mesh exhibit the greatest ultimate load of 14.5 kNm . Sample of section reinforced with glass fiber and welded steel mesh exhibit ultimate load of 6.4 kNm and 1.72 kNm, respectively. Inverse problem was also solved. The reinforcement ratio necessary to ensure equal load-bearing capacity of the panel reinforced with different materials was determined. The reinforcement ratios of steel mesh (S), AR-glass textile (G) and carbon textile (C) were found as S:G:C=1:0.26:0.12. Conclusion. Reinforcement of concrete composites with non-metallic meshes has significant potential for the design of lightweight spatial structures for roofing buildings and structures. The use of high-strength reinforcing textile meshes makes it possible to achieve panel strength comparable to that of traditional reinforced concrete products. It is necessary to consider other strength calculations of folded panels reinforced with non-metallic meshes and experimentally confirm the results of analytical calculations.