Problem 8: A fixed-fixed stepped bar is subjected to an axial force (P) of 200 kN as shown in the following figure. The cross-sectional areas of bars AB and BC are 2400 mm² and 600 mm², respectively. Determine the nodal displacement at point B and reaction forces using finite element method. Take, Young's modulus and Poisson's ratio of bar material are 200×109 N/m² and 0.3, respectively.
