Beams: Symmetric and Unsymmetric Cross Sections
For finding the shear flow distribution and shear center location
in two-cell or multiple-cell (i.e., more than 2 cells),
multiple-flange beams the same
methods demonstrated in section IV.1 can still be used.
Keep in mind that such beams are always statically
indeterminate, and we must use either the
direct method or the shear center method to solve for the shear flow
However, following the procedure described in section IV.1 does not provide
us with sufficient number of equations to solve for all the unknown shear
flows. An important fact to remember in these problems is that
all the cells will twist the same amount.
This will help us establish sufficient number of equations to solve for the unknown shear flows.
The equation for the angle of twist is the same as the one used before for
closed-section beams with constant-shear-flow webs.
- Example 1 Analysis of a two-cell
multiple flange box beam
To Section IV.3
To Index Page of
Transverse Shear Loading of Closed Sections