Please show all steps

For below portal frame with:

$H=5m$;$b=2m$;$d=8m$;$=5$; and $V_{\text{d}\text{e}\text{s}}=32\frac{m}{s}$

Wind direction

Calculate:

a$)$ Design internal pressure

b$)$ Design external pressure $($for windward, leeward, and roof$)$

c$)$ Combined pressures for all scenarios

Assumptions:

$k_c=1($no combination effect$)$; $C_{dyn}=1$

Building is sealed $($no permeable surface$)$ except for leeward wall $($it has a $0\mathrm{.}2$ per

cent open area$)$

$k_l=k_p=k_v=k_a=1,C_{dyn}=1$