SPECIFICATION FOR THE DESIGN OF - Transcon Steel

Commentary on the Prescriptive Method for One and Two Family Dwellings - 2004 67
End wall roof area = (6/12)(15’)(15’) – 11.25 = 101 ft 2
Side wall corner area = (4’+8’)(6’) = 72 ft 2
Side wall area = (4’+8’)(50’) – 72 = 528 ft 2
Side wall roof corner area = (1/2)(7.5)(6)(2) = 45 ft 2
Side wall roof area = (7.5’)(50’) – 45 = 330 ft 2
Building aspect ratio = 50/30 = 1.67
Design shear at each side wall
= [72 ft 2 (22.2 psf)+288 ft 2 (14.7psf)+11.25 ft 2 (22.2 psf)+101 ft 2 (14.7 psf)](1.6)/2 = 5,954 lb
Design shear at each end wall
= [72 ft 2 (27 psf) + (528 ft 2 (20.1psf) + 22.5 ft 2 (3.8 psf) + 330 ft 2 (3.3psf)](1.6)/2 = 10,985 lb
E10.2 Required Sheathing (First Floor Walls)
10,985
Each end wall: = 21.95 ft
910(0.55)
This equates to 73% of end wall length.
5,954
Each side wall: = 11.90 ft
910(0.55)
This equates to 24% of side wall length.
E11 Shear Wall Design (High Seismic Area)
Design the lateral force resisting system for the example building shown below. Use Type I
braced wall for the side walls and Type II braced walls for the end walls.
E11.1 Design Assumptions
Building Width = 30’
Building Length = 50’
Roof Slope = 6:12
Seismic Design Category = D2
Roof Dead Load = 15 psf
Exterior Wall Dead Load = 7 psf
Ground Snow Load = 25 psf
Slab-on-grade foundation
Interior Wall Dead Load = 5 psf
Overhang = 2 ft
Studs: 350S162-33
Stud Spacing = 16” on center
E11.2 Design Loads
Roof Dead Load = 15 psf
Floor Dead Load = 10 psf
Exterior Wall Dead Loads = 7 psf
Interior Walls Dead Load = 5 psf
Floor area = (50’)(30’) = 1500 ft 2
Roof area = [50’ + 2(2)][30’ + 4’] = 1836 ft 2 . (2’ overhangs)