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Bearing Capacity of Footing

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CALCULATION OF BEARING CAPACITY (Vertical Load Only, Drained Condition) FOR RECTANGULAR/SQUARE FOOTING

Reference: EN1997-1:2004 Annex D

qult = c' Nc Sc + ' D Nq Sq + 0.5 ' B' N S


qult = Ultimate Bearing Capacity (kPa)
qall = Allowable Bearing Capacity (kPa)
c' = Effective Cohesion (kPa)
φ' = Effective Cohesion (kPa)
γbulk = Bulk Unit Weight of Soil (kN/m3)
γw = Unit Weight of Water (kN/m3)
Df = Footing Embedded Depth (m)
D1 = GWT Depth (m) (CASE I ONLY)
D2 = Depth from GWT to Soffit of Footing (m) (CASE I ONLY)
d = Depth from Soffit of Footing to GWT (m) (CASE II ONLY)
B' = Effective Breadth of Footing B-2e (m)
L' = Effective Length of Footing L-2e (m)
Nc, Nq, Nγ = Bearing Capacity Factors depending on Friction Angle of Soil  (Formula Refer to EN1997-1:2004 Annex D)
Sc, Sq, Sγ = Shape Factors (Formula Refer to EN1997-1:2004 Annex D)

γbulk γw Adopted qall Factor of


GWT Case c' (kPa) φ' (°) Df (m) D1 (m) D2 (m) d (m) B' (m) L' (m) Nc Nq N Sc Sq S qult (kPa)
(kN/m3) (kN/m3) (kPa) Safety
I (0<D1<Df) 2 28 18.0 10.0 5.80 2.50 3.30 - 6.00 6.00 25.80 14.72 14.59 1.50 1.47 0.70 1867 95 > 3 ,ok
I (0<D1<Df) 2 28 18.0 10.0 5.80 0.00 5.80 - 6.00 6.00 25.80 14.72 14.59 1.50 1.47 0.70 1326 95 > 3 ,ok
II (0<d<B') 2 28 18.0 10.0 1.00 - - 1.00 25.80 14.72 14.59 #DIV/0! #DIV/0! #DIV/0! #DIV/0! 150 #DIV/0!
III (d>B') 2 28 18.0 10.0 1.00 - - - 25.80 14.72 14.59 #DIV/0! #DIV/0! #DIV/0! #DIV/0! 150 #DIV/0!

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