Calculate plastic section modulus and shape factor corresponding to strong axis.

a$)$

b$)$

Determine the nominal flexural strength of the following welded shape: The flanges are $3$

inches $26$ inches, the web is $\frac{1}{2}$ inch $78$ inches, and the member is simply supported,

uniformly loaded, and has continuous lateral support. A$572$ Grade $50$ steel is used.

Determine the nominal flexural strength of the following welded shape: The flanges are $\frac{3}{4}$

inch $18$ inches, the web is $\frac{1}{4}$ inch $52$ inches, and the member is simply supported,

uniformly loaded, and has a span length of $50$ feet. Lateral support is provided at the ends

and at midspan. A$572$ Grade $50$ steel is used.

A welded plate girder has $1-$inch $30-$inch flanges and a $\frac{9}{16}-$inch $90-$inch web. It must

support a service dead load of $4\mathrm{.}2ki\frac{p}{f}t($including the self$-$weight of the girder$)$ and a

service live load of $5ki\frac{p}{f}t$ on a simple span of $75$ feet. The steel has a yield stress of $50$

ksi. If a stiffener is placed at the end of the girder, what is the required distance to the next

stiffener?

a$.$ Use LRFD$.$

b$.$ Use ASD