ᐅ Structural engineer: 2 layers of 8mm reinforcement bars or 1 layer of 16mm reinforcement bar
Created on: 29 Mar 2017 09:53
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pixelprofP
pixelprof29 Mar 2017 09:53How does the tensile strength of reinforced concrete (e.g., in horizontal beams) compare when using 2 x 8mm (5/16 inch) reinforcing bars versus 1 x 16mm (5/8 inch)?
Or also 2 x 6mm (1/4 inch) compared to 1 x 12mm (1/2 inch)? (Assuming identical components and the same steel grade.)
Or also 2 x 6mm (1/4 inch) compared to 1 x 12mm (1/2 inch)? (Assuming identical components and the same steel grade.)
Hello,
Simply put:
just calculate the cross-sectional areas, that should answer your question:
Cross-sectional area of the 8mm reinforcement: 50 mm² (0.08 in²) (4*4*pi)
Cross-sectional area of the 16mm reinforcement: 200 mm² (0.31 in²) (8*8*pi)
The tensile strength of reinforced concrete is largely determined by the reinforcement. So you can’t simply replace one 16mm bar with two 8mm bars; you would actually need around four 8mm bars.
It’s probably not that straightforward in reality, as there are other factors involved, such as the distribution and positioning of the reinforcement.
Best regards,
Andreas
pixelprof schrieb:
if I use 2 x 8mm reinforcement bars compared to 1 x 16mm.
Simply put:
just calculate the cross-sectional areas, that should answer your question:
Cross-sectional area of the 8mm reinforcement: 50 mm² (0.08 in²) (4*4*pi)
Cross-sectional area of the 16mm reinforcement: 200 mm² (0.31 in²) (8*8*pi)
The tensile strength of reinforced concrete is largely determined by the reinforcement. So you can’t simply replace one 16mm bar with two 8mm bars; you would actually need around four 8mm bars.
It’s probably not that straightforward in reality, as there are other factors involved, such as the distribution and positioning of the reinforcement.
Best regards,
Andreas
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