In the previous section, the detailed explanation on the stiffness method of analysis of planar orthogonal and non-orthogonal structures using beam elements and planar truss elements were given. The same algorithm and sign convention are now extended to solve the three-dimensional structures, in order to make the analysis very simple and easier. Let us extend the basics of the beam element discussed so far to the three-dimensional structures. We know that the equation for joint equilibrium of the planar structure is given by, 20.0000 0.0000 0.0000 -70.0000 0 0.0000 -0.0000 -0.0000 -10.0000 25.0000 -10.0000 45.0000