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Performance of GFRP Bars as Shear Friction Reinforcement in Concrete Composite Elements
Composite reinforced concrete elements such as bridge girders typically comprise precast girders and cast in-situ slabs. However, composite members are subjected to horizontal shear induced by gravity loads at the interface between the precast beam and the slab. Shear connectors crossing the interface are used to ensure the composite action and the integrity of these elements. To overcome the steel corrosion problems, glass fiber-reinforced polymer (GFRP) reinforcement has been implemented as the primary reinforcement in concrete elements (bridges and parking structures), especially in harsh environments. Accordingly, this study investigates the performance of GFRP as a shear friction reinforcement in composite concrete elements. The shear friction capacity of GFRP shear connectors at concrete cold joints (concrete-to-concrete interface) without a roughened interface was experimentally examined. The study included three specimens, each comprised of two L-shaped blocks cast at different times to achieve the desired shear plane condition. The specimen measured 1050 mm long, 600 mm wide, and 300 mm thick, resulting in a shear plane of 400 × 300 mm. One specimen was fully reinforced with steel, whereas the others were fully reinforced with GFRP bars. The shear connectors were size 15 M (15.9-mm diameter) Z-shaped steel or GFRP bars. The specimens were tested under monotonic axial load through a push-off test. The main test parameter was the reinforcement ratio of bar connectors crossing the shear plane. The test results were analyzed in terms of load-slip relationship, capacity, and mode of failure. Results have shown the applicability of using GFRP reinforcement to resist shear friction in a comparable manner to its steel counterpart.
Performance of GFRP Bars as Shear Friction Reinforcement in Concrete Composite Elements
Composite reinforced concrete elements such as bridge girders typically comprise precast girders and cast in-situ slabs. However, composite members are subjected to horizontal shear induced by gravity loads at the interface between the precast beam and the slab. Shear connectors crossing the interface are used to ensure the composite action and the integrity of these elements. To overcome the steel corrosion problems, glass fiber-reinforced polymer (GFRP) reinforcement has been implemented as the primary reinforcement in concrete elements (bridges and parking structures), especially in harsh environments. Accordingly, this study investigates the performance of GFRP as a shear friction reinforcement in composite concrete elements. The shear friction capacity of GFRP shear connectors at concrete cold joints (concrete-to-concrete interface) without a roughened interface was experimentally examined. The study included three specimens, each comprised of two L-shaped blocks cast at different times to achieve the desired shear plane condition. The specimen measured 1050 mm long, 600 mm wide, and 300 mm thick, resulting in a shear plane of 400 × 300 mm. One specimen was fully reinforced with steel, whereas the others were fully reinforced with GFRP bars. The shear connectors were size 15 M (15.9-mm diameter) Z-shaped steel or GFRP bars. The specimens were tested under monotonic axial load through a push-off test. The main test parameter was the reinforcement ratio of bar connectors crossing the shear plane. The test results were analyzed in terms of load-slip relationship, capacity, and mode of failure. Results have shown the applicability of using GFRP reinforcement to resist shear friction in a comparable manner to its steel counterpart.
Performance of GFRP Bars as Shear Friction Reinforcement in Concrete Composite Elements
Lecture Notes in Civil Engineering
Desjardins, Serge (editor) / Poitras, Gérard J. (editor) / El Damatty, Ashraf (editor) / Elshaer, Ahmed (editor) / Aljada, Basel H. (author) / El-Salakawy, Ehab F. (author)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
Proceedings of the Canadian Society for Civil Engineering Annual Conference 2023, Volume 12 ; Chapter: 30 ; 375-382
2024-12-13
8 pages
Article/Chapter (Book)
Electronic Resource
English
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