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Thanks guys for all the information, i'm still searching the answer. i'll share with you the correct answer when i find it.

I agree with you Lion06, but in the best case we cannot reach a factor multiplying bearing capacity higher than 2, but the effect of confined concrete and the proyection of the bearing stress can be the explanation to this large number. Waiting for the answer. Thanks for your cooperation.

Does anyone know from where this equation comes Np=8*Abrg*f'c, i cant understand the multiplier 8 in the equation, it is not consequent with the bearing strength calculations of 0,85f'c. If anybody knows, Thanks.