Question

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 carried by the steel portion.

Answer #1

(30 pts) A short reinforced concrete column is
subjected to a 1000 kN axial compressive load. The moduli of
elasticity of plain concrete and steel are 25 GPa and 207 GPa,
respectively, and the cross-sectional area of steel is 2% 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 rebars, calculate the following:
a. the modulus of elasticity
of the reinforced concrete
b....

Select a light W shape for a column subjected to an axial
compressive load of 1623kN. The unbraced length of column is 5m and
the ends are pinned. Use A36 grade steel.

A column is made of concrete and reinforced with a W-section
steel with an area of 2000 mm2. The dimension of the column is
300mm x 350mm. The column is subjected to an axial load of 100 kN.
What will be the deformed length of the column? Use Es =
200 GPa and Ec = 25 GPa.

A composite member is made of a hollow steel pipe with an inner
diameter of 12” and wall thickness 1”. The hollow steel pipe is
filled with concrete and subjected to a compressive force of
120,000 lbs. The member length is 25’. The modulus of elasticity of
concrete and steel are Ec = 3,600,000 psi and
Es = 30,000,000 psi, respectively. Calculate the axial
and compressive loads resisted by the steel and concrete.
Fconcrete = 45000 lbs ; Fsteel =...

2. Design a reinforced concrete beam of 20 feet span carrying a
uniformly distributed load of 1200 lbs/ft. Use Fc = 3,000 psi and
steel stress of 20,000 psi and assume appropriate modulus of
elasticity and other required material properties.

A reinforced concrete column, 5.0 m high has a cross section
of 400 mm x 400 mm. it is reinforced by four steel bars each 20 mm
in diameter and carries a load of 1000 kN. Young’s modulus for
steel is 200,000 N/mm2 and for concrete is 15,000 N/mm2. Determine
the deformation in mm?
please show solution

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

Concrete is required for an interior concrete column in a
commercial building in Corvallis, Oregon. A specified compressive
strength, f’c , of 4000 psi is required at 28 days using
an ASTM C 150 Type I. The design calls for a minimum of 3 in. of
concrete cover over the reinforcing steel. The minimum distance
between reinforcing bars is 2.5 in. A slump of 4 inches should be
the target. No statistical data on previous mixes are available.
Follow mixture...

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