a$)$ For the frame below perform an incremental plastic analysis to compute the force vs displacement curve

$($consider the horizontal displacement of point C$),$ the collapse load and the safety factor SF;

b$)$ Verify the solution by performing a nonlinear static analysis using a FEM code such as Straus$7.$ Hint: you

can use both the exact and the approximated moment$-$curvature relationships;

Beam and Column