Problem $3[25$ Points$]$

A fa$$ade framing elevation of a hotel lobby is shown in Figure $3.$

A$)$ Assume the entire fa$$ade is in Zone $4$ loading, and

determine the uniformly distributed wind load for:

a$.$ Mullion M$1($unit: lbf$/$ft$)$

b$.$ Header Beam $($unit: lbf$/$ft$)$

B$)$ Reference Figure $4.$ Assume the first and last bays are in

Zone $5$ loading and the remaining bays are in Zone $4.$

Determine the uniformly distributed wind load for:

a$.$ Mullion $2($unit: lbf$/$ft$)$

b$.$ Header Beam $($unit: lbf$/$ft$)$

C$)$ Reference Figure $3.$ Use the tributary area reduction graph

as shown in Figure $5$ and determine:

a$.$ Reduced wind pressure for mullion M$1($unit: psf$).$

b$.$ Reduced wind pressure for header beam $($unit: psf$).$

c$.$ Reduced uniformly distributed wind load for mullion M$1($unit: lbf$/$ft$).$

d$.$ Reduced uniformly distributed wind load for

header beam $($unit: lbf$/$ft$).$

Assumptions:

Wind pressure $($Intermediate Zone or Zone $4)=25$ psf

Wind pressure $($Corner Zone or Zone $5)=60$ psf

Parameters:

$a=49ft$

$h_1=h_2=18ft$

Mullion spacing $=\frac{a}{7}$

Figure $4-$ Facade Framing Plan

Figure $5-$ Tributary Area Reduction Factors