Three equidistant vertical rods, each of 20 mm diameter, support a load of 25 kN in the same plane as shown in Fig.1 Initially, all the rods are adjusted to share the load equally. Neglecting any...

Three equidistant vertical rods, each of 20 mm diameter, support a load of 25 kN in the same plane as shown in Fig.1 Initially, all the rods are adjusted to share the load equally. Neglecting any chance of buckling, and taking Esteel = 205 GPa and Ecopper = 100 GPa, determine the initial and final stresses when a further load of 20 kN is added.

Extracted text: 25 kN ASTEEL ACOPPER STEEL 2.8 m > 3.6m