Since for a non-concurrent, non-coplaner (general) force system we have 6 equilibrium equations, we should be able to use these equations to solve for the 6 unknown loads.
Hence, in statically determinate box beams, we do not need to use the procedure involving the general shear flow equation as described in previous section.
If we were to modify the box beam by including an additional stiffener, then the problem becomes statically indeterminate as there would be 8 unknown loads to solve for as opposed to 6 in the previous case.
Under these conditions, we rely on the procedure described in the previous section based on the general shear flow equation. The solution procedure becomes much simpler, however, as the shear flow along each web is constant.
The example below describes the method of solution for statically determinate stiffened box beams. The discussion of statically indeterminate box beams will be given in the next section.
To Section IV.1
To Index Page of Transverse Shear Loading of Closed Sections