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A platform for research: civil engineering, architecture and urbanism
Hybrid strengthening and flexural behaviour of post-tensioned laminated glass beams
https://orcid.org/0000-0003-3822-0730
https://orcid.org/0000-0002-2727-3266
https://orcid.org/0000-0003-3048-1290
Highlights Mechanical post-tensioning was shown to be feasible for increasing glass fracture strength; Fe-SMA activation layout can be adapted to the load distribution for optimal behaviour; Hybrid strengthening systems showed to be efficient in preventing premature debonding; The post-cracking behaviour showed to be dependent on the strengthening system and on the prestressing level; Cracking load was maximized by applying NSM-CFRP and EBR-SMA reinforcements.
Abstract The strengthening of glass for structural applications is challenging. EBR (External Bonded Reinforcement) reinforcement is often preferred, although limitations result from stress concentrations especially in the case of post-tensioning. This study explores the use of CFRP (Carbon Fiber Reinforced Polymers) and/or Fe-SMA (Iron-based Shape Memory Alloys) as reinforcement in hybrid and alternative configurations. Five full size laminated glass beams were tested in flexure, combining NSM (Near-Surface Mounted) and EBR techniques and exploring the efficiency of different alternative strengthening layouts (i.e. reinforcement material versus application technique) to overcome the current shortfalls of glass strengthening for structural applications. Even for lower reinforcement ratios, hybrid strengthening systems performed better and increased load-carrying capacity while delaying crack-induced deboning failure, when compared to conventional EBR systems. Residual strength ratio increased from 87 % to 160.8 % and ductility from 407 % to 971 %. The hybrid system combining NSM-CFRP and EBR-SMA reinforcements showed the best performance, increasing the initial fracture stress of glass and maintaining sufficient residual strength capacity, while allowing the safe post-tensioning.
Hybrid strengthening and flexural behaviour of post-tensioned laminated glass beams
https://orcid.org/0000-0003-3822-0730
https://orcid.org/0000-0002-2727-3266
https://orcid.org/0000-0003-3048-1290
Highlights Mechanical post-tensioning was shown to be feasible for increasing glass fracture strength; Fe-SMA activation layout can be adapted to the load distribution for optimal behaviour; Hybrid strengthening systems showed to be efficient in preventing premature debonding; The post-cracking behaviour showed to be dependent on the strengthening system and on the prestressing level; Cracking load was maximized by applying NSM-CFRP and EBR-SMA reinforcements.
Abstract The strengthening of glass for structural applications is challenging. EBR (External Bonded Reinforcement) reinforcement is often preferred, although limitations result from stress concentrations especially in the case of post-tensioning. This study explores the use of CFRP (Carbon Fiber Reinforced Polymers) and/or Fe-SMA (Iron-based Shape Memory Alloys) as reinforcement in hybrid and alternative configurations. Five full size laminated glass beams were tested in flexure, combining NSM (Near-Surface Mounted) and EBR techniques and exploring the efficiency of different alternative strengthening layouts (i.e. reinforcement material versus application technique) to overcome the current shortfalls of glass strengthening for structural applications. Even for lower reinforcement ratios, hybrid strengthening systems performed better and increased load-carrying capacity while delaying crack-induced deboning failure, when compared to conventional EBR systems. Residual strength ratio increased from 87 % to 160.8 % and ductility from 407 % to 971 %. The hybrid system combining NSM-CFRP and EBR-SMA reinforcements showed the best performance, increasing the initial fracture stress of glass and maintaining sufficient residual strength capacity, while allowing the safe post-tensioning.
Hybrid strengthening and flexural behaviour of post-tensioned laminated glass beams
https://orcid.org/0000-0003-3822-0730
https://orcid.org/0000-0002-2727-3266
https://orcid.org/0000-0003-3048-1290
Highlights Mechanical post-tensioning was shown to be feasible for increasing glass fracture strength; Fe-SMA activation layout can be adapted to the load distribution for optimal behaviour; Hybrid strengthening systems showed to be efficient in preventing premature debonding; The post-cracking behaviour showed to be dependent on the strengthening system and on the prestressing level; Cracking load was maximized by applying NSM-CFRP and EBR-SMA reinforcements.
Abstract The strengthening of glass for structural applications is challenging. EBR (External Bonded Reinforcement) reinforcement is often preferred, although limitations result from stress concentrations especially in the case of post-tensioning. This study explores the use of CFRP (Carbon Fiber Reinforced Polymers) and/or Fe-SMA (Iron-based Shape Memory Alloys) as reinforcement in hybrid and alternative configurations. Five full size laminated glass beams were tested in flexure, combining NSM (Near-Surface Mounted) and EBR techniques and exploring the efficiency of different alternative strengthening layouts (i.e. reinforcement material versus application technique) to overcome the current shortfalls of glass strengthening for structural applications. Even for lower reinforcement ratios, hybrid strengthening systems performed better and increased load-carrying capacity while delaying crack-induced deboning failure, when compared to conventional EBR systems. Residual strength ratio increased from 87 % to 160.8 % and ductility from 407 % to 971 %. The hybrid system combining NSM-CFRP and EBR-SMA reinforcements showed the best performance, increasing the initial fracture stress of glass and maintaining sufficient residual strength capacity, while allowing the safe post-tensioning.
Hybrid strengthening and flexural behaviour of post-tensioned laminated glass beams
Rocha, Jorge (author) / Pereira, Eduardo (author) / Michels, Julien (author) / Sena-Cruz, José (author)
2023-10-01
Article (Journal)
Electronic Resource
English
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