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Shear Capacity of Inverted Concrete T Beams

Shear Capacity of Inverted Concrete T Beams

Shear Capacity of Inverted Concrete T Beams

(OP)
Can the overhanging flanges of an inverted T beam supporting DT's be accounted for when determining the concrete shear capacity of the section?

RE: Shear Capacity of Inverted Concrete T Beams

It would depend on the dimensions of the T beam, but in most cases, I doubt the corbeled part of the T would add much to the overall shear capacity of the section.

RE: Shear Capacity of Inverted Concrete T Beams

(OP)
The corbeled part would be 30 cm. deep by 20 cm. long (overhang) on each side which would give me an extra 1,200 cm2 area.

RE: Shear Capacity of Inverted Concrete T Beams

I have never used flanges as part of the shear capacity of the beam.  Only the full-depth web portion.

 

RE: Shear Capacity of Inverted Concrete T Beams

What is the total depth of the T beam and the width of the web?  Is it prestressed?  What arrangement is used for the stirrups?

RE: Shear Capacity of Inverted Concrete T Beams

The codes only allow the beam web to be used in the shear calculations and I would comply with that. With shear being a brittle failure mechanism I would not try to optimize the design by using the outstands of the inverted-T to gain additional capacity. I would just bring closer the spacing of the shear reinforcement near the support.

RE: Shear Capacity of Inverted Concrete T Beams

(OP)
Your thoughts coincide with mine. I did not take the outstands into account when designing for shear. Nothing closer stirrup spacings couldn't take care of. Thanks.

RE: Shear Capacity of Inverted Concrete T Beams

Not a clearcut problem.  Good that you have solved it.

BA

RE: Shear Capacity of Inverted Concrete T Beams

I think the reason for ignoring the outstand is that, if it is in tension, that spoils its shear resistance which comprises diagonal tension and compression. However, some reinforcement in the flange could change that, especially as the flange is quite narrow. I agree shear failures are to avoided. Always look out for diagonal cracks in webs, esp at the neutral axis.

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