A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Investigation of Shear Capacity to Facilitate More Efficient Short-Span R/UHPC Beams
Ultra high performance concrete (UHPC) is a cementitious material containing a large percentage of cement, and 1–3% by volume of randomly distributed steel fibers. When UHPC is reinforced with longitudinal steel, R/UHPC members can develop significantly higher strength for a given cross-sectional area than traditional concrete members. Due to the compressive properties of UHPC, larger longitudinal reinforcement ratios than commonly used in reinforced concrete lead to more efficient use of both the UHPC and steel materials. The objective of this research is to explore various methods of providing shear capacity in R/UHPC beams subjected to high shear demand. Specifically, this study explored short-span R/UHPC beams where steel fiber content and longitudinal steel reinforcement ratio were held constant at 0.5% and 3.9%, respectively. Transverse steel spacing, transverse steel grade, and placement method were varied in seven small scale R/UHPC beams, which were experimentally tested to failure. Results indicated that traverse steel spacing had the greatest impact on specimen response. More transverse steel did not significantly increase load carrying capacity, however, it increased ultimate drift by 24%. Increasing the grade of the transverse steel did not significantly impact response, indicating that the shear force capacity within each transverse reinforcing bar was not a limiting factor to specimen performance. While some differences in fiber orientation within the R/UHPC beams were observed, the impact of placement method on beam response was negligible.
Investigation of Shear Capacity to Facilitate More Efficient Short-Span R/UHPC Beams
Ultra high performance concrete (UHPC) is a cementitious material containing a large percentage of cement, and 1–3% by volume of randomly distributed steel fibers. When UHPC is reinforced with longitudinal steel, R/UHPC members can develop significantly higher strength for a given cross-sectional area than traditional concrete members. Due to the compressive properties of UHPC, larger longitudinal reinforcement ratios than commonly used in reinforced concrete lead to more efficient use of both the UHPC and steel materials. The objective of this research is to explore various methods of providing shear capacity in R/UHPC beams subjected to high shear demand. Specifically, this study explored short-span R/UHPC beams where steel fiber content and longitudinal steel reinforcement ratio were held constant at 0.5% and 3.9%, respectively. Transverse steel spacing, transverse steel grade, and placement method were varied in seven small scale R/UHPC beams, which were experimentally tested to failure. Results indicated that traverse steel spacing had the greatest impact on specimen response. More transverse steel did not significantly increase load carrying capacity, however, it increased ultimate drift by 24%. Increasing the grade of the transverse steel did not significantly impact response, indicating that the shear force capacity within each transverse reinforcing bar was not a limiting factor to specimen performance. While some differences in fiber orientation within the R/UHPC beams were observed, the impact of placement method on beam response was negligible.
Investigation of Shear Capacity to Facilitate More Efficient Short-Span R/UHPC Beams
RILEM Bookseries
Ferrara, Liberato (editor) / Muciaccia, Giovanni (editor) / di Summa, Davide (editor) / Frank, Timothy (author) / Amaddio, Peter (author) / Tri, Alexis (author) / Decko, Elizabeth (author) / Farrell, Darcy (author) / Landes, Cole (author) / Kates, Joshua (author)
RILEM Spring Convention and Conference ; 2024 ; Milan, Italy
Proceedings of the RILEM Spring Convention and Conference 2024 ; Chapter: 20 ; 174-183
RILEM Bookseries ; 56
2024-11-07
10 pages
Article/Chapter (Book)
Electronic Resource
English
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Governing failure criterion of short-span hybrid FRP-UHPC beams subjected to high shear forces
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