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Building Design and Construction Handbook - Merritt - Ventech!

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COLD-FORMED STEEL CONSTRUCTION 8.15<br />

FIGURE 8.5 Effective width of stiffened compression elements with<br />

stiffening lips assumed to be fully effective.<br />

where E � modulus of elasticity, 29,500 ksi for steel<br />

I � moment of inertia of bar cross section, in 4<br />

L � column length of bar, in<br />

Bryan, in 1891, determined the critical buckling stress, ƒ cr, ksi, for a thin rectangular<br />

plate compressed between two opposite edges with the other two edges<br />

supported, to be given by<br />

2 2 2<br />

ƒcr � k� E(t/w) /12(1 � � ) (8.2)<br />

where k � a coefficient depending on edge-support restraint<br />

w � width of late, in<br />

t � thickness of plate, in<br />

� � Poisson’s ratio

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