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Eccentric Loading on Spread Footing

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I am checking an AASHTO spread footing design where the eccentric biaxial
loading is high but the resulting bearing pressures are 1/2 the allowable. 

The kern is governing the dimensions of the footing due to AASHTO, last sentence, which mandates the eccentricity be within 1/6 of
the footing dimension in any direction.  

Has anyone found relief for this controlling statement?  Why would AASHTO
give formulae for eccentricities > 1/6 the footing dimension if it is not
allowed? (See Eqn.



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