Consider the continuous beam shown. Beam sections for analysis: $bh=4065cm$

Materials: $F^{\text{'}}C=250k\frac{g}{c}m2(E=$ cte $)$ ; $Fy=4,200k\frac{g}{c}m2$; load combination: U$2=1\mathrm{.}2DL+1\mathrm{.}6$

LL

lengths: Lab$=8m$;$Lbc=$Lcd$=9m$

Recessed A and D ends; articulated$/$roller supports B and C

Problem $1$:

Problem $1[20$ pts$].$ Consider the ultimate moment diagrams, Mu in the figure $($for a load wu

$1\mathrm{.}2wDL1\mathrm{.}6wLL).$ Review the cross sections for Mn and indicate which moment it

corresponds to and in which bed $($upper$/$lower steel$)$ you would place each section at the left,

right and center of beam segment BC$.$ Solve on paper. Make a sketch $($below$)$ with each

cross section WELL oriented to take either Positive or Negative moment. Comment on your

results.$|$