Question

CE Board May 2012

A 450 mm square interior column carries a dead load of 825 KN and a live load of 668 KN. A rectangular footing is required to carry the column loads such that the length of the long side must be equal to twice the width of the short side. Assume base of footing is 1.5 m below the ground surface. Allowable bearing pressure of soil is 15.74 KN/m3 and that of concrete is 23.5 KN/m3. Use normal weight concrete. Thickness of footing is 0.60 m. Determine the steel requirements in the short and long direction.

Answer #1

**Assumed Data: f _{c}^{'}
= 27.6 MPa, f_{y} = 415 MPa.
**

**Allowable bearing pressure = 190
kN/m ^{2}**

^{}

Design a wall footing to support a 300 mm reinforced concrete
wall with dead load of 292KN/m and live load of 200 KN/m. The
bottom of the footing is 1.20 m below the final grade, the soil
weighs 15,700 N/m3. The allowable soil pressure is 190 Kpa. fy =
276.5 Mpa, fc’ = 27.6 Mpa.

A 1.5 m x 1.5 m square footing will be constructed on cohesive
soil. A centric column load on the footing is 250 kN. A unit weight
of soil, (γsoil) is 18.8 kN/m3 where as the unit weight of
concrete, (γconcrete) is 23.5 kN/m3. Cohesive soil with unconfined
compressive strength, (UCS) is 143.6 kN/m3. Design;
(i) the soil contact pressure.
(ii) the factor of safety against bearing capacity failure.

Determine the allowable design load for a column resting on a
rectangular footing 2 m by 9 m, buried to a depth of 2 m in clay
soil with a unit weight of 18.5 kN/m3, internal friction
of 39 degrees, a drained cohesion of 36 kPa and undrained shear
strength of 119 kPa. Assume the short-term condition governs, water
table is at the ground surface and use a factor of safety of 3.
Provide your answer in kN as a...

A square-shaped spread footing with plan dimensions of 3m x 3m
is supporting a 500mm square concrete interior column. The column
carries a total factored load of 2850 kN. Use 25M bars Clear
cover=75mm fc’ = 25 MPa fy = 400 MPa
a) Determine the factored bearing pressure, qf, acting on the
soil due to the factored load, Pf=2850kN
b) Design the footing thickness based on two-way (punching)
shear requirements (Assume single shear will be satisfied). Assume
that the factored...

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