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99_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

99_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - BC14...

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BC14 a = a M. .___r--.. Eccentric Loading: i.e. load not at footing center - overturning moment o Overturning moment equivalent to eccentric load at distance e from footing centerline a Consider footing of width B and length L o Examine pressure distribution under footing o Assume footing is rigid and that soil has ~t~~~i~t::~~i~i::t?~~~t~:~~~~t::ng linear behavior. Use beam analogy. o Separate flexural and uniform load components B a a gllllilorm - A = L Mc (~HB/2) _ 60e t! I I I , I (LB'/12) LB' o Sum the components: = + =..9..+ 60e q qUI1I!orm - qllex BL - LB2 q =..9..[1+6e] and q. =..9..[1_ 6e ] max BL B min BL B - , , " , " , I I I ~ I~ , IjY 1/ I 1/ ~ I x and qmin = 0 this equation is valid for e :5 B/6 at which point qmin = a (To prevent tipping, most designers maintain e
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