C WSF 2012 Showalter Connections
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Transcript of C WSF 2012 Showalter Connections
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Connection Solutions for
Wood-frame Structures
Presented by:
John Buddy Showalter, P.E.
Vice President, Technology Transfer
The Wood Products Councilis a Registered Provider with . Credit(s) earned on completion of this program will be reportedto AIA/CESfor AIA members. Certificates of Completion for both AIA
members and non-AIA members are available upon request. This program is registered with AIA/CESfor continuing professional
education. As such, it does not include content that may be deemedor construed to be an approval or endorsement by the AIA of any
material of construction or any method or manner of handling, using,distributing, or dealing in any material or product.
Questions related to specific materials, methods, and services will beaddressed at the conclusion of this presentation.
Copyright Materials
This presentation is protected by US and
International Copyright laws. Reproduction,distribution, display and use of the presentation
without written permission of the speaker isprohibited.
American Wood Council 2012
Learning ObjectivesAt the end of this program, participants will be knowledgeable of:
1. Identify basic wood material properties and learn how to
avoid splits, notching, and checking in connection
solutions.
2. Recommend fastening guidelines for wood-to-steel,wood-to-concrete, and wood-to-wood connections.
3. Describe effects of moisture on wood connections andimplement proper flashing to avoid problems.
4. Identify proper fastener selection in size, scope, andpattern.
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initiators:
notches large diameter fasteners hanging loads
Split
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Load
Displacement
high strength, poor ductilitygood strength, good ductility
low strength, good ductility
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No end caps or flashing
end caps and flashing
Moisture trap -
No weep holes
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Saturated
19% MC
Dry
CM 1.0 0.7 0.4*
Lateral load (*CM=0.7 for D1/4)
fabrication MCin-service MC
CM= 1.0 if:
1 fastener
2+ fasteners
split spliceplates
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Slotted hardware
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Need 1/2air gap between
wood and masonry
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www.tfguild.org
www.timberframe.org
Schmidt, R.J. (2006): Timber Pegs Considerations for Mortise and Tenon
Joint Design, Structure Magazine, March 2006, NCSEA, 13(3):44-47.
Fastener Values
Included in U.S. design literatureFastener Type Reference
Bolts NDS or NER
Lag Screws NDS or NER
Wood Screws NDS or NER
Nails & Spikes NDS or NER
Split Ring Connectors NDS
Shear Plate Connectors NDS
Drift Bolts & Drift Pins NDS
Metal Plate Connectors NER
Hangers & Framing Anchors NER
Staples NER
National Evaluation
Reports (NER) are
developed for
proprietary products
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Center-Point Bending TestLoad
6 Yield ModesSingle & double shearWood-to-woodWood-to-SteelWood-to-Concrete
I
II
III
IV
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Nail Types and Designations
Nail types described in Appendix LNail Types and Designations
Nail capacity tables in 2005 NDS
NDS 11.3.4 The length of dowel bearing shall notinclude the length of the tapered tip of a fastener for
fastener penetration lengths less than 10D.
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l l
shearplane
Dr
use D
r
shear plane
Because the induced
maximum moment canoccur in the threadsif
the shear planeis not
located sufficiently into
the shank away from thethreads
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Group Action Factor, Cg
Equation method
where:
( )( )[ ]
+
+++
=
m
R
mmmRn
mmC EA
nn
EA
n
g1
1
111
)1(2
2
ss
mm
mm
ss
EA
AE
AE
AE
AER oroflessorthe=
1
2
= uum
++=
ssmm AEAE
su
11
21
Group Action Factor, Cg
Group Action Factor , Cg
Not applicable here- loads acting along the
length of the member are unit loads
Anc hor Bol ts and
Washers as requiredBottom Plate
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Appendix ENDS Expressions
Group tear-out
Note: spacing between outer rowsof fasteners paralleling the member
on a single splice plate < 5
netgrouptbottomRTtopRT
GT AFZZ
Z
++= '''
'
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Hidden kerf plates
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Connectionsdesign
software
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