Say I have a cantilevered W-section beam with a backspan of 25 feet and the cantilever extending 8 feet out over a column support. There is uniform loading (due to concrete slab, etc.) along the entire length of the beam, and there is a substantial concentrated load at the end of the cantilever. Obviously the top flange of the beam is continuously laterally braced by the metal deck/concrete slab (Lb=0), but what is the unbraced length of the bottom flange if it is in compression due to negative moment over the column? Is it the distance from the column support (which braces the bottom flange through the cap plate connection and beams framing in perpendicular at this location) to the inflection point in the backspan, where moment changes from negative back to positive?
Thanks for any feedback.
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