Figure 1. Cross's illustration for the Moment Distribution Method. He assumed that the members would be straight and of uniform section. Siffnesses were proportional to the moments of inertia (I), divided by the lengths (L), but the relative volume given for I/L in the problems might as well be the relative stiffness of a series of beams of varying section. In that case the carry-over factors would not be - ½. | back to text |