Calculating Compression of Bored Out Steel Column - Stress & Strain

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SUMMARY

The discussion focuses on calculating the total compression of a bored out steel column under a load of 1 MN. The column has a length of 90 cm and a diameter of 150 mm, with a hole of 100 mm diameter and 60 cm length bored out. Using the modulus of elasticity for steel, E = 200 GN/m², participants emphasize the importance of understanding how the change in cross-section affects stress and, consequently, compression calculations.

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I have been given a question to recap by my tutor as i find this topic fairly difficult.

A steel column is 90cm long and 150mm diameter. If a hole 100mm diameter and 60cm long is bored out, calculate the total compression of the column when carrying a load of 1MN. Take the modulus of elasticity for steel, E = 200 GN/m squared.

I have done similar questions to this before but have never learned how to calculate the compression of a bored out steel column!

Any help on how to start this off will be very much appreciated!
 
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Well, if you bore a hole, you change the cross section, right? How does stress relate to cross section?
 

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