W
Wood Design
NDS calculator
Calculators
Beam Design
Column Design
Diaphragm
Shear Wall
Connections
Project
Diaphragm
Horizontal diaphragm unit shear & chord forces per SDPWS Ch. 4.
Code edition
NDS 2018
NDS 2024
Design diagram
— updates live with your inputs
Drag the square handles to reshape the outline — length L and depth W follow the bounding box.
Plan shape
rectangle
L
T
U
polygon
Drag the outline handles in the diagram; L/W follow the bounding box
Sheathing
Wood structural panel - blocked
Wood structural panel - unblocked
Panel nominal thickness
(in)
3/8
7/16
15/32
19/32
23/32
Nail size
6d
8d
10d
Common nails
Boundary nail spacing
(in)
6
4
2.5
2
Field nail spacing
(in)
12
10
6
Framing
DF-L / SP (SG>=0.49)
Other (SG<0.49)
Specific gravity adjustment
Diaphragm length (load dir)
(ft)
Dimension parallel to load
Diaphragm depth
(ft)
Dimension perpendicular to load
Lateral load w
(plf)
Distributed shear input
Seismic (vs wind)
Yes
Selects ASD reduction basis
Run calculation
NDS 2018