Question

Determine the design wind pressure using the simplified wind method for a building located in South Carolina with a basic wind speed of 110 mph, a height of 25 ft, a wind exposure of C, and an occupancy category of III. A) 29.8 B) 34.9 C) 31.4 D) 24.7

Answer 1

Given

Basic wind speed = 110 mph

height = 25 ft

wind exposure = C

occupancy category =III

CODE TO BE USED : ASCE 7

Design wind pressure = _s30 (simplified wind method)

is adjustment factor for building height and exposure

I is Importance factor

P_s30 is simplified design pressure for exposure B at height 30 ft and I is 1

From ASCE 7

For height 25 ft and Exposure C : =1.35 (figure 6.2 ASCE 7)

For occupancy category III : I=1.15 (table 6-1 ASCE 7)

P_s30 =19.2 psf ( figure 6.2 ASCE 7)

Design wind pressure = (19.2)x(1.15)x(1.35)

=29.808 psf

ANSWER IS OPTION A