A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Structural Behaviour of Shape Optimized Fabric Formed Reinforced Concrete Beams
In the pursuit of a sustainable future, global attention has focused on greenhouse gas emissions and their contribution to climate change. The concrete and steel industries account for approximately 14% of global CO2 production, warranting a need for improvement. The carbon footprint of reinforced concrete (RC) structures can be reduced by optimizing elements within the structures to use less material. Using fabric formwork, shape optimized beams that reduce concrete volume by up to 40% can be created. In this research, 12 beams with varying levels of shape optimization were fabricated then tested in three-point bending until failure. Distributed sensing was used in conjunction with traditional instrumentation to better understand the behaviour of optimized RC beams. Distributed fibre opting sensing (DFOS) was used to record strain measurements internally along reinforcing steel, and digital image correlation (DIC) was used to measure crack data. Initial testing unveiled distinct design and fabrication errors and failure mechanisms that can occur when proper detailing is overlooked. A first series of specimens was tested and had reduced capacities as a result of issues such as voids caused by movement of the forms, inadequate anchorage, the presence of torsion, and most notably, a shear failure mechanism that can occur in I-shaped cross-sections that results in the bottom flange separating from the beam. Two beams in the initial testing program were retrofitted to mitigate the shear in the bottom flange failure mechanism, but although they improved the capacity, both specimens still experienced a brittle shear failure. A second series of beams were designed accounting for the issues seen in the first series. The shape optimized beams had transverse ties in the bottom flange and a fillet between the bottom flange and web. These beams all reached flexural yielding except for the prismatic I-beam which failed in shear within 1% of the flexural yielding load. The tapered beams achieved a higher load carrying ...
Structural Behaviour of Shape Optimized Fabric Formed Reinforced Concrete Beams
In the pursuit of a sustainable future, global attention has focused on greenhouse gas emissions and their contribution to climate change. The concrete and steel industries account for approximately 14% of global CO2 production, warranting a need for improvement. The carbon footprint of reinforced concrete (RC) structures can be reduced by optimizing elements within the structures to use less material. Using fabric formwork, shape optimized beams that reduce concrete volume by up to 40% can be created. In this research, 12 beams with varying levels of shape optimization were fabricated then tested in three-point bending until failure. Distributed sensing was used in conjunction with traditional instrumentation to better understand the behaviour of optimized RC beams. Distributed fibre opting sensing (DFOS) was used to record strain measurements internally along reinforcing steel, and digital image correlation (DIC) was used to measure crack data. Initial testing unveiled distinct design and fabrication errors and failure mechanisms that can occur when proper detailing is overlooked. A first series of specimens was tested and had reduced capacities as a result of issues such as voids caused by movement of the forms, inadequate anchorage, the presence of torsion, and most notably, a shear failure mechanism that can occur in I-shaped cross-sections that results in the bottom flange separating from the beam. Two beams in the initial testing program were retrofitted to mitigate the shear in the bottom flange failure mechanism, but although they improved the capacity, both specimens still experienced a brittle shear failure. A second series of beams were designed accounting for the issues seen in the first series. The shape optimized beams had transverse ties in the bottom flange and a fillet between the bottom flange and web. These beams all reached flexural yielding except for the prismatic I-beam which failed in shear within 1% of the flexural yielding load. The tapered beams achieved a higher load carrying ...
Structural Behaviour of Shape Optimized Fabric Formed Reinforced Concrete Beams
Mason, Jared (author) / Civil Engineering / Hoult, Neil / Woods, Joshua / Bentz, Evan
2023-10-20
Theses
Electronic Resource
English
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