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Reinforcing Bar Connection of Hollow-Core Slabs to Steel Beam Supports
Flooring systems constructed with precast/prestressed Hollow-Core Slabs (HCS) over steel beams usually employ size 10 M “Z-shaped” steel bars as connection reinforcement. The purpose of these connection bars is to avoid slab displacements and assure the overall structural integrity of the floor. However, there are no provisions in North American codes nor the literature about the design or behaviour of such connections. As a result, the Z connection bars are employed in practice without proper evaluation of its capacity or mode of failure. Therefore, four full-scale bar connections of HCS to steel beams were assembled and tested under in-plane forces (pushing or pulling the slabs) to investigate its capacity and overall behaviour. Results demonstrated that the mechanism of failure for the specimens subjected to push-out forces (compression) was governed by bar bending and buckling. In these cases, the connection bar did not yield at maximum capacity. However, the specimens tested under pull-out forces (tension) failed due to grout splitting after developing higher strains in the unrestrained portion of the bar or bar yielding. The connection bar demonstrated little capacity under compression forces, while it met code requirements for the capacity of bearing connections under tension forces.
Reinforcing Bar Connection of Hollow-Core Slabs to Steel Beam Supports
Flooring systems constructed with precast/prestressed Hollow-Core Slabs (HCS) over steel beams usually employ size 10 M “Z-shaped” steel bars as connection reinforcement. The purpose of these connection bars is to avoid slab displacements and assure the overall structural integrity of the floor. However, there are no provisions in North American codes nor the literature about the design or behaviour of such connections. As a result, the Z connection bars are employed in practice without proper evaluation of its capacity or mode of failure. Therefore, four full-scale bar connections of HCS to steel beams were assembled and tested under in-plane forces (pushing or pulling the slabs) to investigate its capacity and overall behaviour. Results demonstrated that the mechanism of failure for the specimens subjected to push-out forces (compression) was governed by bar bending and buckling. In these cases, the connection bar did not yield at maximum capacity. However, the specimens tested under pull-out forces (tension) failed due to grout splitting after developing higher strains in the unrestrained portion of the bar or bar yielding. The connection bar demonstrated little capacity under compression forces, while it met code requirements for the capacity of bearing connections under tension forces.
Reinforcing Bar Connection of Hollow-Core Slabs to Steel Beam Supports
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Hernandez Brito, S. (author) / Mahmoud, K. (author) / Truderung, K. (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 49 ; 573-580
2022-04-14
8 pages
Article/Chapter (Book)
Electronic Resource
English
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