Question

Deign a square tied column to support a service axial dead load
P_d of 200 K and a live load P_l of 300 K using concrete f_c^'=4000
psi and bars f_y=60000psi (use steel ratio of about 3% design the
ties and check the ACI code requirements)
**ACI-318**

Answer #1

Design the largest axially loaded rectangular column with the
aspect ratio of b/h = 1.5 to support an axial dead load of 350 k
and axial live load of 380 k. f’c = 4000 psi, fy= 60,000 psi.

Design a square axially loaded short square tied column for
concentric ultimate axial load Pu = 2600 kN. f’c = 28 MPa and fy =
350 MPa. assume ρ = 0.02.
Draw the section details showing dimensions, cover, rebars,
stirrups (ties), ..etc.

A 24 in. x 16 in. column on the second floor of a multi-story
building is to be designed to carry a live load of 500,000 lb, and
a dead load that is 75 % of the live load (includes self weight).
The nominal moment is calculated to be 5,769 kip.in. Use the
interaction diagrams with γ = 0.8 to design the column
reinforcement for a concrete strength of 4000 psi and a steel
strength of 60000 psi. Include the...

A short reinforced concrete column is subjected to a 700 kips
axial compressive load. The modulus of elasticity of plain concrete
and steel are 4,500,000 psi and 29,000,000, respectively, and the
cross-sectional area of steel is 3.0% of that of the reinforced
concrete. Considering the column as a structural member made of a
composite material and subjected to load parallel to the steel
bars. Calculate the modulus of elasticity of the reinforced
concrete, as well as how much load is...

A short, square tied column has a minimum area of reinforcing
steel of 3.24 in2 and a gross area of 18 in2.
The compressive strength of the concrete is 4000 lbf/in2
and the yield strength of the steel is 60,000 lbf/in2.
What is most nearly the design axial compressive load capacity?
A) 130 kips
B) 140 kips
C) 570 kips
D) 400 kips

A
500mm width square tied column with reinforcement on four faceshas
a gross steel ratio is 0.02 and the concrete cover from the column
surface to the steel centroid is 100 mm.
what is the nominal axial capacity of the column if subjected
to biaxial bending where ex=ey=250 mm? use fy'=21 Mpa and fy= 415
Mpa, reciprocal load method and interaction diagram below.

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...

An A992 W21×111 is used as a column in a building to support a
dead load of 120 kips and a live load
of 300 kips. The column effective length is 22 ft for the y-axis
and 33 ft for the x-axis. Determine whether the column
will support the load by LRFD.

Design a one-way floor slab to carry a uniform live load of 500
psf on a simply supported span of 21 ft, given
fc’=4000 psi and
fy=50000 psi. Use the ACI 318 code. Keep the
reinforcement ratio at about 30% of the amount of balanced strain
condition so that deflection is unlikely to be excessive.

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.

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