Addressing Gusset Problems: Pipe Cracking Part 3

This final issue on gusset problems will discuss why gussets are "stiffeners" rather than "strengtheners". The effective load bearing capacity of a member of given strength is based upon how large a cross-sectional area is carrying the load. Gussets are commonly welded to tubular members to reduce their flexure under a bending load. The lift bar shown in Figure 1, at the right serves to illustrate this principal.

Figure 1

A tube, when used in a structural application where bending loads are encountered, behaves like a wide flange beam. As shown in Figure 2, the top and bottom portions of the circular cross section for the flanges, while the side portions take the place of the web. The neutral axis is through the center of the tube.