PSI - Issue 64

Ravina Sriram et al. / Procedia Structural Integrity 64 (2024) 2051–2058 R. Sriram/ Structural Integrity Procedia 00 (2019) 000–000

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Conversely, in instances where there are no deficiencies in the support, but rather the area beyond the shear perimeter as well as in the sagging zones, the prestressing of reinforcement within these sagging regions is beneficial. The second case study illustrates that prestressing of Fe-SMA strips in the sagging region improve punching shear resistance. However, it is clear from calculation results that the magnitude of impact is less compared to prestressing over the supports. Regardless, this method offers a distinct advantage in scenarios where the structural integrity outside the critical shear perimeter is compromised, suggesting a valuable role in retrofitting and strengthening existing structures, especially when combined to increase the bending resistance in the positive moment area. With the ease of application of Fe-SMA at the construction site, these methods are more cost-effective and simpler to implement than many traditional approaches. However, it is paramount to stress the importance of context-specific applications, underscoring the necessity for engineers to assess the unique challenges and requirements of each structure individually. References Arslantürkoglu, S., & Bärtschi, R. (2017). Punching Shear and Critical Shear Crack Theory In Existing Column-Supported RC Slabs . SMAR 2017 - Fourth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures. Béton (fib), F. I. du. (2020). FIB Model Code 2020 for Concrete Structures . Ernst & Sohn. Čereš, D., & Gajdošová, K. (2021). Strengthening flat slabs without shear reinforcement against punching shear by concrete ov erlay. IOP Conference Series: Materials Science and Engineering , 1209 (1), 012056. https://doi.org/10.1088/1757-899X/1209/1/012056 Einpaul, J., Fernández Ruiz, M., & Muttoni, A. (2015). Influence of moment redistribution and compressive membrane action on punching strength of flat slabs. Engineering Structures , 86 , 43–57. https://doi.org/10.1016/j.engstruct.2014.12.032 Janke, L. (2005). Applications of shape memory alloys in civil engineering structures—Overview, limits and new ideas. Materials and Structures , 38 (279), 578–592. https://doi.org/10.1617/14323 Muttoni, A. (2008). D0226 Tragsicherheit von Einstellhallen . SIA. Rezapour, M., Ghassemieh, M., Motavalli, M., & Shahverdi, M. (2021). Numerical modeling of unreinforced masonry walls strengthened with Fe-based shape memory alloy strips. Materials , 14 (11), 2961. Ruiz, Miguel Fernández, Muttoni, Aurelio, & Kunz, Jakob. (2011). Strengthening of Flat Slabs Against Punching Shear Using Pos t-Installed Shear Reinforcement. ACI Structural Journal , 107 (4). Schranz, B. (2021). Iron-based Shape Memory Alloy Reinforcement for Prestressed Strengthening of Concrete Structures (p. 250 p.) [[object Object]; Application/pdf]. https://doi.org/10.3929/ETHZ-B-000499175 Shahverdi, M., Raza, S., Ghafoori, E., Czaderski, C., Michels, J., & Motavalli, M. (2022). Recent advancements in development and application of an iron-based shape memory alloy at Empa. Chimia , 76 (3), 242–242. Walraven, J., & Dieteren, G. (2023). Approach to assessment of existing structures in the fib Model Code 2020. Structural Concrete , 24 (4), 4387–4395. https://doi.org/10.1002/suco.202300076