Shear options
1. moment frame (not covered in textbook)
- strong corners
- members bend
- rare in wood structures
- Simpson Strong Frame
2. braced frame (not covered in textbook)
- diagonals in tension/compression
- Simpson
3. shearwall
- sheathing
- wall acts as a deep cantilever
LRFD vs ASD variables
u subscript = variable is at LRFD or strength level
no u subscript = variable is at ASD level
Horizontal deflection, Δ
no subscript = total building
s subscript = shear wall
D subscript = diaphragm
Horizontal LFRS elements
1. horizontal wall framing (girts) (not covered in textbook)
2. vertical wall framing (studs) with trusses (not covered in textbook)
3. vertical wall framing (studs) with diaphragms (most common)
Diaphragm flexibility
ASCE 7 section 12.3
IBC section 1613.6.1