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footing tie beams

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I would appreciate input on the function of  RC footing tiebeams. Does anybody know basis for using 10% of the column load to design reinforced concrete footing tie beams  ?  Since the tie beams are connected  to RC columns , shouldn't it be designed for flexure induced by the columns also. How do you include the tiebeams in the
sructure model?
 
Based on the 10% column load rule, the footing beams can
be part of a foundation diaphrapm to transfer base shear to shear walls in the case of dual or shear wall system.
 
How about in SMRSF system?