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A hollow circular steel column 2m long and outer diameter 200 mm carries an axial load...

A hollow circular steel column 2m long and outer diameter 200 mm carries an axial load of 325 kN. If the compressive stress is 150 MPa, lateral strain for external diameter is is 0.000325 and Poisson’s ratio is 0.3, find the minimum wall thickness required for the column. Also calculate the shear modulus for the material of the column. Take E = 210 GPa.
  

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