The bar element 4–1 of length L and the cross-sectional area A is oriented at an angle c...

The bar element 4–1 of length L and the cross-sectional area A is oriented at an angle clockwise from the x axis (Fig. P7.17). Calculate (a) the global stiffness matrix of the bar; (b) the axial force in the bar; (c) the local displacements at the ends of the bar. Given: A = 1350 mm² , L=1.7 m, a=60°,