Frequently Asked Questions
Where can I find information on flitch beams or composite wood members?
Structure Magazine article titled "Flitch Plate Beams - Design Guide" by Jim DeStefano, P.E., which includes coverage of the design of connections for composite beams:
http://www.structuremag.org
McGraw Hill's Wood Engineering and Construction Handbook, 3rd Edition by Faherty and Williamson, contains a design example problem in section 10.3 on Wood-Metal composites. This is available on ICC's website at http://www.iccsafe.com/
Kluwer Academic Publishers' Structural Design in Wood by Stalnaker and Harris, contains several design example problems in Section 13-4 on Wood Beams Reinforced with Metal. ISBN 0-412-10631-0
A publication is available on request as an archival copy through the NAHB Research Center titled, Flitch Plate and Steel I-Beams - Beam Series 5. ISBN 0-86718-141-9. It contains tabulated information on flitch beams up to 20ft spans.
http://www.nahbrc.org/
(301) 249-4000.
Section: Wood Connections and Assemblies
- What are the connection requirements for built-up beams?
- Where can I find information on flitch beams or composite wood members?
- Where can I find resistance values, connection details and other general information for bolts, lag screws, wood screws, nails, split ring and shear plate connections?
- Where can I find manufacturers of prefabricated wood connectors?
- Do you have information on toe-nail connections?
- Where can I find information on dowel bearing strength for plywood and OSB?
- How does the group action factor apply to connections? And Does the group action factor, Cg, apply to sill plates and ledgers?
- Are self-tapping lag screws covered by provisions in the NDS?
- What is the difference between full diameter and reduced diameter body lag screws (also known as lag bolts)?
- Where can I find referenced standards for dimensional tolerances for nails?
- Where can I find more information about the NDS reference, Square and Hex Bolts and Screws, Inch Series?
- Where can I obtain information on plywood gusset (gussett) plate connections and plywood gusset trusses?
- Where can I find design information for staples and/or pneumatic nails?
- Where can I find suppliers of timber rivets?
- Where can I find information on bracing of metal plate connected wood trusses?
- Where can I find information on wood dowel (wood peg) design values?
- Does the penetration depth factor, Cd, apply to design values for lag screws, wood screws, or nails?
- Where can I find information about designing anchor bolts per ACI 318 Appendix D and the NDS?
- The column heading for NDS® (2001/2005) Table 11.2A states that diameter for determining withdrawal design values is the "unthreaded shank diameter, D." Should withdrawal design values for reduced body diameter lag screws (see NDS Appendix L) be based on the reduced body diameter or the outside thread diameter?