Problem 2.19

 

 

	Symbol	Hint	Value	Reference
basic wind speed	V	Tampa, Florida	120	Google Maps, ASCE 7 figure 6-1, ASCE 7 figure 6-1B,
importance factor	I	essential facility	1.15	ASCE section 6.5.5, ASCE 7 table 1-1, ASCE 7 table 6-1
height and exposure factor	λ	flat roof, 30 ft above grade, exposure B	1.00	ASCE 7 figure 6-2 page 4, ASCE 7 figure 6-3 page 4
simplified design wind pressure for exposure B, at h = 30 ft, and for I = 1.0	ps 30	enclosed	see reference	ASCE 7 figure 6-2 page 2
topographic factor	Kzt		1.0	given
design wind pressures in each zone for main wind force-resisting systems	ps		see below	ASCE 7 section 6.4.2
net design wind pressure for exposure B, at h = 30 ft, and for I = 1.0	pnet 30	enclosed	see reference	ASCE 7 figure 6-3 page 2, ASCE 7 figure 6-3 page 4
design wind pressures for components and cladding in zones near discontinuities and zones away from discontinuities	pnet		see below	ASCE 7 section 6.4.2

 

p_s = λ K_zt I p_{s 30}

 

Zone	horizontal pressures (walls)				vertical pressures (roofs)				overhangs (roofs)
	A	B	C	D	E	F	G	H	EOH	GOH
ps (psf)	26.22	-13.69	17.37	-8.05	-31.51	-17.94	-21.97	-13.92	-44.16	-34.62

 

p_s = λ K_zt I p_{net 30}

 

Zone	roofs			walls		overhangs
	1	2	3	4	5	2	3
pnet (psf) for 10 ft2	12.08	12.08	12.08	29.79	29.79	-42.90	-70.73
	-29.79	-50.03	-75.21	-32.32	-39.91