Draft

2.3LateralLoads 39

0 5 10 15 20 25 30 35 40 45 50

Approximate Design Wind Pressure (psf)

0

50

100

150

200

250

300

350

400

Height Above Grade (ft)

Exposure B, 70 mph

Exposure B, 80 mph

Exposure C, 70 mph

Exposure C, 80 mph

Figure2.7:ApproximateDesignWindPressurep forOrdinaryWindForceResistingBuilding

Structures

Example2-2: WindLoad

Determinethewindforcesonthebuildingshownonbelow which is builtin St Louisandis

surroundedby trees.

Solution:

1. FromFig. 2.5themaximumwindvelocity is St. Louisis 70mph,sincethebuildingis

protectedwe cantakeCe= 0:7,I= 1:. Thebasewindpressureisqs= 0: 00256 (70)

2

=

12 :54 psf.