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Tower of Pisa (Italy)
?Settlement and or
Soil Collapse
Grain Silo in Transcona (Canada)
Failure modes of strip footing
(a) General shear, (b) local shear, (c) punching shear in: dense / stiff soil high compressible soils (HCS) HCS / considerable depth.
Plastic Zone Development / Description
Development of Plastic Zone
Bearing capacity of shallow footing
qf = 1/2 γ B Nγ + c Nc + γ D Nq (K. Terzaghi)
Nq = exp (π tan φ) * tan2 (45° + φ/2) Nc = (Nq � 1) * cot φ Nγ = 1,8 (Nq � 1) * tan φ
square: sγ = 0,8 sc = 1,2 and circular: sγ = 0,6 sc = 1,2
Footing depth
BearingCapacity
Factors
Bearing capacity of shallow footing
Influence of size, ground water and weak stratum
Contact Stress Distribution
k = E/Edef . (T/L)3 If k > 1.0 Stiff Footing
Footings Subjected to Moment
Footing subjected to moment andhorizontal load
Design Chart:
Bearingcapacitywithrespect to acceptablesettlement
Degree of Consolidation - SF
2htcT v ⋅=
Degree of Consolidation - VD