Variational Methods. Principle of stationary potential energy. Potential energy of an elastic body. Bar and Beam Elements. Shape functions. Stiffness matrix. Boundary conditions. Applied mechanical loads. Equilibrium equations. Stresses. Solution of equations. Basic Elements. Stress-strain relations. Interpolation and shape functions. Linear triangle. Rectangular solid elements. Numerical integration. One, two and three dimension applications. Elasticity relations. FEM in Structural Dynamics. Dynamic equation. Mass and damping matrices. Natural frequencies and mode shapes, solutions method. Response History. Modal methods. Harmonic response. Direct integration methods-explicit or implicit.