Question

compare the suitability of the solid rectangular and hollow square columns to support a compressive load and comment on two of their key geometrical design aspects.

Answer #1

The hollow square column can withstand the same stress as that
of solid rectangular column...

Strength to weight ratio is better for a hollow square than a solid
rectangular column. This means a hollow square column is stronger
than a solid rectangular column of equal mass and the same
material.

The maximum shear stress is at the outer side of surface, so the elements at the outer side is contributing its full resistance force to torque applied while the inside elements are not contributing its full resistance, thus causing loss of material.

For resisting the torsion load the polar moment area is considered as the resisting area so, if polar moment area of any shape is more it can withstand more torque compared to other.

During construction, field tests were conducted to
assess the suitability of the column to withstand a safe buckling
load of 2.5 kN assuming a factor of safety 4 using two different
hollow columns made up of steel and concrete. Both columns have
same cross section but varying length and different support
conditions. Steel column of length 3 m having external diameter 40
mm was tested with one end fixed and the other end hinged, when
subjected to a compressive stress...

1: During construction, field tests were conducted to assess
the suitability of the column to withstand a safe buckling load of
2.5 kN assuming a factor of safety 4 using two different hollow
columns made up of steel and concrete. Both columns have same cross
section but varying length and different support conditions. Steel
column of length 3 m having external diameter 40 mm was tested with
one end fixed and the other end hinged, when subjected to a
compressive...

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

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