Civil Engineering Reference
In-Depth Information
11.20 A short reinforced concrete column is subjected to a 500 kips axial
compressive load. The moduli of elasticity of plain concrete and
steel are and respectively, and the cross-
sectional area of steel is 1.8% 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. the load carried by each of the steel and plain concrete
c. the minimum required cross-sectional area of the column, given
that the allowable compressive stress of plain concrete is 5000
psi and that the allowable compressive stress of plain concrete
will be reached before that of steel.
10
6
psi
10
6
psi,
4.5
*
30
*
11.4
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