Hence, one possible mode of failure is the local buckling at the compression flange or at the section web before column failure.
However, local buckling of the compression flange may occur before the section reaches the full dynamic plastic resistance in the plastic mechanism collapse mode.
If there is no compression flange
then value of [b.sub.c] = 0.
To accurately establish l-joist stiffness and strength, it was essential to maintain lateral stability of the I-joist compression flange
during each test.
The current load resistance factor design (LRFD) equations for I-joist lateral buckling assume that the compression flange acts as a column restrained in the direction of the web.
Increased I-joist spans have led to questions about the lateral stability of these structural framing materials in situations where continuous lateral bracing is not provided along the compression flange, e.g., wind uplift or other load reversals where the bottom edge of the beam is not completely braced.
From experience, this is the usual case; if an I-joist is devised such that bending failures are mostly in the compression flange
or in the web, further study will be required.
Technical limitations on suction blow molding, however, are that it doesn't readily allow either compression flanges
on parts or metal inserts, the way x-y-z and robotic tooling approaches do.