20_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

20_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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,lmmedlate-Set1lement Case I: B B I I I _._-'_. __ 1- I I I L p3 toading on the Surface aLan ElastiGJ:Ialf SpacJl (e.g. a thiclclayer of ciay) kv,~ ~t.'\C 0 .... J I ...,~' q B circle, square, or rectangular footing ( 1-1") P, = C,qB E where ~ = Poisson's ratio (often taken as 0.5) E = Young's modulus q = uniformly distributed loading (psf, tsf, kPa etc) B = footing width (stlQI;I.§ig.e.or.diaW§ier) L = foofing length (long side) Cs = specific settiement point location ¥ See Table P1 {:{ a Example: A rectangular mat 160' x 80' carries a uniformly distributed load of 1,000 psf. The underlying soil is a deep clay layer wi E = 8.5 x 105 psf. Assume II = 0.5 (corresponds to zero volume change) and fhat the mat is
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Unformatted text preview: flexible P, = C,qBC-{) = C s [(1 000psf)(80')(1-0.5 2 )/ 8.5x10 5 psf](12"1') = [s (,. ~'1I1 ') at center C s = 1.52 => Pi = 1.52 (0.8471") = 1, '). ~I " at corner Cs = 0.76 Pi 0.76 (0.8471") = ' ,'" => = o. middle short side Cs = 0.98 => Pi = 0.98 (0.8471") = o. n middle long side C s = 1.12 => Pi = 1.12 (0.8471") = (). tr 5" average C s = 1.30 => Pi = 1.30 (0.8471") = /.10 '/ A mat is neither completely flexible nor completely rigid. Because of ifs large size, the distribution of contact pressure may be assumed as nearly uniform over the center portion of the mal. At the corners the rigidity of the mat (due to thickness and amount of reinforcing) may be significant and settlements are likeiy to be less than predicted....
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This note was uploaded on 02/10/2012 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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