36 A coldformed Zsection made from lightgage steel has lips

#36

A cold-formed Z-section made from light-gage steel has lips formed at the edges of the flanges as shown.

The primary function of the lips is to

(A)

increase the moment of inertia of the section about its strong axis

(B)

increase the resistance of the flanges to flexural compressive stress

(C)

increase the torsional rigidity of the section

(D)

increase the shear resistance of the section

So answer is (B)