$($a$)$ Calculate permanent actions for columns A$,$ B and E$,$ at section $1$ and

section $2$ for the office building from figure $1.$

Beams and columns are made by concrete with a density of $2400k\frac{g}{m^3}.$

Assume for this exercise that:

cross section for beams is $250550mm,$

cross section for columns is $450450mm,$

concrete floor height is $200mm.$

$($b$)$ Find the value of combinations of permanent and imposed actions for

ultimate limit state for columns A$,$ B and E$,$ at sections $1$ and $2.$ Assume for

this calculation that for roof the type of activityloccupancy is $"R_2($i$)$ Structural

elements".