ASD/LRFD Manual - American Wood Council

92 M13: TIMBER RIVETS
M13.1 General
This Chapter covers design for timber rivets. Timber
rivets are hardened steel nails that are driven through predrilled
holes in steel side plates (typically 1/4" thickness)
to form an integrated connection where the plate and rivets
work together to transfer load to the wood member.
M13.2 Reference Design Values
Reference wood capacity design values parallel to
grain, P w , are tabulated in the timber rivet Tables 13.2.1A
through 13.2.1F in the NDS.
Reference design values perpendicular to grain are
calculated per NDS 13.2.2.
for the connection. NDS Table 10.3-1 lists all applicable
adjustment factors for timber rivets. Table M13.2-1 shows
the applicability of adjustment factors for timber rivets in
a slightly different format for the designer.
Design Adjustment Factors
Connections must be designed by applying all applicable
adjustment factors to the reference lateral design value
Table M13.2-1 Applicability of Adjustment Factors for Timber Rivets 1
Timber Rivets
Allowable Stress Design Load and Resistance Factor Design
P′ = P C D C M C t C st P′ = P C M C t C st K F φ z λ
Q′ = Q C D C M C t C ∆ Q′ = Q C M C t C ∆ K F φ z λ
1. See NDS Table 10.3.1 footnotes for additional guidance on application of adjustment factors for timber rivets.
For a timber rivet connection installed in side grain
perpendicular to the length of the wood members, with
metal side plates 1/4" or greater, used in a normal building
environment (meeting the reference conditions of NDS
2.3 and 10.3), and where wood capacity perpendicular to
grain, Q w , does not control, the general equations for P′
and Q′ reduce to:
for ASD:
P′ = P C D
Q′ = Q C D
for LRFD:
P′ = P K F φ z λ
Q′ = Q K F φ z λ
M13.3 Placement of Timber Rivets
Installation Requirements
To achieve stated design values, connectors must
comply with installation requirements such as spacing of
connectors, minimum edge and end distances per NDS
13.3; and drilling of lead holes, minimum fastener penetration,
and other fabrication requirements per NDS 13.1.2.
American Wood Council