SPECIFICATION FOR THE DESIGN OF - Transcon Steel

66 Commentary on the Prescriptive Method for One and Two Family Dwellings - 2004
E10 Shear Wall Design (Two Story Building)
The segmented shear wall line has the following dimensions:
Wall construction:
Building width = 30’
Building length = 50’
Wall Height = 8’
Roof slope = 6:12
Exterior sheathing is 7/16-inch-thick OSB with No. 8 screws spaced 6 inches on center
on panel edges and 12 inches on center in panel field
Interior sheathing is 1/2-inch-thick gypsum wall board with No. 6 screws at 12 inches
on center
Framing studs are 350S162-33 spaced at 24 inches on center
Calculate the sheathing requirements for the side and end walls. The building is subjected
to a wind speed of 100 mph, Exposure Category C.
E10.1 Design Loads
From Table C2.1: (100 mph, exposure C, 6:12 roof slope)
MWRFS building corner
wind pressure
MWRFS building wind pressure
Roof corner wind pressure
Roof wind pressure
Building gable end
Building gable end corner
= 27 psf
= 20.1 psf
= 3.8 psf
= 3.3 psf
= 14.7 psf
= 22.2 psf
Nominal shear value per foot of shear wall for 7/16 inch thick OSB at the stated
fastening and a 2:1 aspect ratio is 910 plf (Table 2211.1(3) of IBC 2000 (ICC, 2000a)). The IBC
provides shear values for GWB with 7 inch o.c. fastener spacing. It provides no shear values
for 12 inch o.c. fastener spacing.
Where LRFD is used, the IBC 2000 (ICC, 2000a) requires the factored design shear value
to be determined by multiplying the ultimate shear value by a resistance factor (Φ) of 0.55.
Calculate corner area width (2a), where “a” equals 10% of least width or 0.4h (whichever
is smaller) but not less than either 4% of least width or 3 feet.
a = 10%(30) = 3’
a = 0.4(30) = 12’
Use a = 3’
2a = 6’
End wall corner area = (4’+8’)(6’) = 72 ft 2
End wall area = (4’+8’)(30’) - 72 = 288 ft 2
End wall roof corner area = (1/2)(7.5)(3’) = 11.25 ft 2