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How to calculate the Effective Flange Width of a Foundation Beam

How to calculate the Effective Flange Width of a Foundation Beam

How to calculate the Effective Flange Width of a Foundation Beam

(OP)
Hi,

1. In Reinforced Concrete Design of monolithic beams and slabs, when designing the beams the effective flange of the beam needs to be taken into account. Therefore designing a T-shaped section.



2. There is a similar concept in the the design of foundation beams embedded within a raft foundation (inverse T-shaped section), however I am not sure if i should use the same equations to determine the effective flange of the foundation beam.

what do you guys think?

RE: How to calculate the Effective Flange Width of a Foundation Beam

Sure, why would you think it would be different? Your loads are just soil pressures rather than floor pressures.

-Mac

RE: How to calculate the Effective Flange Width of a Foundation Beam

(OP)
Well I just wanted some seconds thoughts on it, maybe there is literature on this subject that i didnt find yet.

RE: How to calculate the Effective Flange Width of a Foundation Beam

Quote (kellez)

There is a similar concept in the the design of foundation beams embedded within a raft foundation (inverse T-shaped section)

Are the flanges sometimes in tension?

A sketch of your actual situation might help here. Is the "beam" element entirely embedded within the raft slab?

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.

RE: How to calculate the Effective Flange Width of a Foundation Beam

(OP)
Hi,

Yes the foundation beams are completely embedded within the foundation slab, they have the same thickness of 45cm. Please see drawings below
The foundation slab also has upper and lower reinforcement,

I am designing against earthquake according to EC8.





This is an example of the type of foundation I am using




RE: How to calculate the Effective Flange Width of a Foundation Beam

Yeah, in that case I'd say that the usual effective width requirements are sensible.

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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