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152_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

152_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - o...

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DF31 Failure Criteria ~, 0 many different criteria - seek to limit movement, guard against sudden failure o plunging failure is weak soil- mostly side shear (A) o sands densify with load, strong soils carry more load - gradual failure Applied Load, P Typical load·seulement curves: Curve A is typical in soft clayey soils (note plunge); and Curve B is typical of intermediate, stiff clay and sandy soils (ever-increasing load). Davisson Failure Criteria o most common, based on settle\ment control (use 8/30 instead of (0.15+8/120) if 8 > 24")
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Unformatted text preview: o FS will limit settlement to elastic range, help to avoid creep Applied Load. P Pull B = Foundation Diameter P = Applied Load II = Settlement D = Foundation Depth A = Foundation Cross-Section Area E = Foundation Modulus of Elasticity = (200.000 MPa) 29.000,000 Iblin. 2 for Steel = 4700. .q; MPa or S7.000~ Ib/in. 2 for Concrete = (I ].000MPa) 1.600,000 Iblin. 2 for Pine or Fir f; = 28 day compressive strength (MPa. Iblin. 2 ) 0.15 in (4 mm) + l~O...
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