1.

The required section modulus of the channel/I-section purlin can be determined by

A. Z<sub>pz</sub> = M<sub>y</sub> <sub>m0</sub>/f<sub>y</sub> + (b/d)(M<sub>z</sub> <sub>m0</sub>/f<sub>y</sub>)
B. Z<sub>pz</sub> = M<sub>z</sub> <sub>m0</sub>/f<sub>y</sub> + (b/d)(M<sub>y</sub> <sub>m0</sub>/f<sub>y</sub>)
C. Z<sub>pz</sub> = M<sub>z</sub> <sub>m0</sub>/f<sub>y</sub> + 2.5(b/d)(M<sub>y</sub> <sub>m0</sub>/f<sub>y</sub>)
D. Z<sub>pz</sub> = M<sub>y</sub> <sub>m0</sub>/f<sub>y</sub> + 2.5(b/d)(M<sub>z</sub> <sub>m0</sub>/f<sub>y</sub>)
Answer» D. Z<sub>pz</sub> = M<sub>y</sub> <sub>m0</sub>/f<sub>y</sub> + 2.5(b/d)(M<sub>z</sub> <sub>m0</sub>/f<sub>y</sub>)


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