Question

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 of

0.0045 MN/cm2 shortens by 3.6 mm.

If the concrete column was tested under similar loading conditions
with one end fixed and other end free considering modulus of
elasticity of concrete equal to 128 GPa, what will be the
corresponding length of the column required? As a design engineer
how do you choose the values for the thickness of both columns and
the length of the concrete column? What will be
your interpretations regarding the relationship between the support
conditions and the buckling load

based on the test results?

Answer #1

thank you!!!!! plz vote

B

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