A steel pipe of external diameter 500 mm and wall thickness 12 mm is flled with concrete and the composite is subject to an axial load. What is the maximum allowable load if the stress in the steel is...

A steel pipe of external diameter 500 mm and wall thickness 12 mm is flled with concrete and the composite is subject to an axial load. What is the maximum allowable load if the stress in the steel is not to exceed 120 MPa and that in the concrete not to exceed 8 MPa? The steel has a modulus of elasticity of 200 GPa and the concrete a modulus of elasticity of 14 GPa.