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Camparison of section capacity of concrete beam of rearrangement bars in beam

Camparison of section capacity of concrete beam of rearrangement bars in beam

Camparison of section capacity of concrete beam of rearrangement bars in beam

(OP)
Due to site condition the original arrangement of bars in concrete beam of one layer of 10T32 has been rearranged to 2 layers of 5T32. Is there a big impact in section capacity of the beam?

RE: Camparison of section capacity of concrete beam of rearrangement bars in beam

Yes - your depth to centroid of reinforcement has been reduced (smaller "d") so your flexural capacity, and shear capacity, is reduced.

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RE: Camparison of section capacity of concrete beam of rearrangement bars in beam

The relative impact on this change will depend primarily on the overall depth of the beam. Any beam will be affected, but a 2' deep beam much more so than a 6' deep beam.

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The name is a long story -- just call me Lo.

RE: Camparison of section capacity of concrete beam of rearrangement bars in beam

I was planning to say just what Lomarandil did. Deeper beams tend to be quite insensitive to this kind of thing. Consider:

- I'm guessing this raises your reinforcement centroid about 1.5" (32 mm x (0.5 + 0.7)). Thus reducing your effective depth 1.5".

- For this change to affect your capacity by more than 5%, you're beam would need to be shallower than 30".

So, in KootK-land, we'd be letting this roll if the beam was 30" deep or more.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

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