In: Civil Engineering

**The detail of column and pad footing are as under:
[5]**

** **
_{ } Size of column:
300 mm x 300 mm.

**Live load on column: 900
kN.**

** **

**Dead load on column: 1200
kN.**

** **

**Soil Bearing Pressure: 180
kN/m² and Depth of footing as 400 mm**

** **

**Nominal cover: 50 mm and 20 mm
diameter bars for reinforcement**

**Design the footing for bending.**_{ }**Check the footing in two way shear.**

**iii.** **Write the reasons for considering the
service loads for dimensioning of the footing** **and
factored loads for calculating the factored soil
pressure.**

**Consider f**_{cu}=40 N/mm^{2}, f_{y}=460 N/mm^{2}, severe exposure condition and 2 hours of fire resistance for all the questions.**Use B.S 8110 for all your calculations and references.****Draw the structural detailing after designing each member for all the questions.****Unit weight of concrete as 25 kN/m**^{3}

Design for britishcode 8110
Design a square pad footing for a 300 mm square column
supporting a factored axial load of 800 kN. Safe bearing capacity
of soil is 200 kN/m2, fcu=20
N/mm2, fy=415 N/mm2.Design a
square pad footing for a 300 mm square column supporting a factored
axial load of 800 kN. Safe bearing capacity of soil is 200
kN/m2, fcu=20 N/mm2,
fy=415 N/mm2.

Design a square interior column footing for a 15-in. square tied
interior column that supports a dead load of 160 kips and live load
of 180 kips. The column is reinforced with eight # 8 bars, also,
the base of the footing is 6 ft below the grade line, the soil
weight is 100 lb/ft3, the concrete weight is 150 lb/ft3, f’c =
4,000 psi, fy = 60,000 psi and qa = 4 kip/ft2.

Explain the way to construct pad footing step by step with
sketch.
1) Setting Out
2) Excavation Works
3) Install Formwork
4) Install Reinforcement
5) Inspection of workdone before concreting
6) Concreting work

QUESTIONS:
Design a square column footing for a 20-in. square
tied interior column that supports loads of DL (170) k and Live
load LL (210) k. The column is reinforced with eight No 8 bars, the
bottom of the footing is 5 foot below final grade, and the soil
weighs 100 lb. /ft3 the allowable soil pressure is 4 w ksf. The
concrete strength is 4,000 psi and the steel is Grade
60.

A square footing is supporting a single interior column with a
dimension of 12 in × 12 in. The column carries axial loads as
follows: 100 kip dead load and 80 kip live load. Use normal-weight
concrete with ?? ′ = 3 ksi, ?? = 60 ksi, and ?? = 5 ksf. The
distance from the bottom of the footing to final grade is 5 ft. The
height of the footing is 36 in and the concrete cover is 3.5...

W1, W2 and X are given at the bottom.
Design a square column footing for a 18-in. square tied interior
column that supports loads of DL (W1) k and Live load LL (W2)
k.
The column is reinforced with eight No 8 bars, the bottom of the
footing is 5 foot below final grade, and the soil weighs 100 lb
/ft3 the allowable soil pressure is w ksf.
The concrete strength is 4,000 psi and the steel is Grade
60....

What will be the length (L in meter) of a
rectangular footing to support rectangular column 20x70 cm and
carries a dead load of 625 kN and live load of 426 kN. The net
allowable bearing pressure is 155 kPa. The design should be
according to (ACI) code with the following parameters: fc’ = 28
MPa, fy = 420 MPa.

Arrive at the size of the rectangular RCC footing for a
column of size 300 mm × 450 mm supporting an axial service load of
1200 kN. The SBC of soil is 200 kN/m2. Take M30 grade
concrete, Fe415 steel, the angle of internal friction of soil is
300 and unit weight of soil is 19
kN/m3.

What will be the width (B in meter) of a square
footing to support rectangular column 40x40 cm and carries a dead
load of 614 kN and live load of 477 kN. The net allowable bearing
pressure is 180 kPa. The design should be according to (ACI) code
with the following parameters: fc’ = 28 MPa, fy = 420
MPa.

Design a square concrete column footing to support a 500-mm x
500-mm reinforced concrete column. The center of the column and
footing must coincide.
Loads: ???=350 ??, ???=480 ??, ???=100 ??−?, ???=130 ??−?
Column Design Criteria: ??′=28 ???, ??=400???
Footing Design Criteria: ??′=28 ???, ??=400???, ??=175 ???,??=1.50
?, ??=16 ??/?3,??=24 ??/?3, ??=20 ??, assume a thickness of the
footing of 500 mm.

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