$14.$In the AISC Manual. Part $3,$ Table $3-10,$ entitled $"$W Shapes A vailable Moment vs$.$ Unbraced Length". The plot of each W shape shown in these charts is characterized with a solid circle and a hollow circle. These circles represent:

a$)L_p$ and $L_m$

b$)L_{}$ and $L_m.$

c$)L_p$ and $L_8.$

d$)L_s$ and $L$

c$)$ None the above.

$15.$ Using the LRFD method, select the lightest IV $-$ shaped beam section to resist a total factored moments $M_0=615\mathrm{.}00k.t,F_y=50$ksi,$C_b=1\mathrm{.}00,$ beam span $=$

$40$ fond assuming that lateral bracing is provided at the beam cnds and at nidspan only. Neglect beam self$-$weight. Specify the beam zone,

a$)122794-$Zone $2$

c$)1/3094-$ Zone $2$

$16.$ According to the AISC Specification, a noncompact section is one for which the buckling occur: can be reached in some of its compression elements before

a$)$ Yield streas.

b$)$ Tensile stress.

c$)$ Buckling stress.

d$)$ Cracking stress.

e$)$ All the above.

$17.$ Using the LRFD method, select the lightest $W-$ shaped $($Noncompact$)$ by section to resist a total factored moments $M_{}=100\mathrm{.}00k.$ft$,F_y=50kss$ assuming full lateral bracing for the compression flange. Neglect bey weigh. Use AISC Manual, Par $3,$ Table $3-2,$ entitled $"$W Shapes Sel $Z_x$ :

$($a$)W_{12}**22$

b$)W10**12$

c$)W8**31$

d$)W10**26$

e$)W8**10$