Governing Yield Modes for Common Bolted and Nailed Wood Connections
Publication: Practice Periodical on Structural Design and Construction
Volume 5, Issue 1
Abstract
Connections in wood structures are important when designing for ductility. The 1997 Uniform Building Code has taken this into consideration when designating wind and earthquake load duration factors for connections. Factors of 1.6 or 1.33 may be applied to the connection strength, depending on the type of yield mode exhibited by the connection, which may be determined from the yield limit equations supplied in the National Design Specification for Wood Construction (NDS). The NDS provides the designer with multiple tables containing capacities for various common connections. Unfortunately, yield modes are not published along with tabulated capacities. Therefore, the designer must carry out potentially cumbersome calculations using the NDS yield limit equations simply to determine the governing yield mode before an appropriate Uniform Building Code load duration factor can be applied. In this paper, several NDS tables are extended to include capacity and yield mode, smaller side member thickness configurations are added to the existing nail/spike tables, and a useful toe-nail table is provided. The overall purpose of these tables is to accelerate the design process by eliminating time-consuming calculations.
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References
1.
“ANSI/AF&PA NDS—1997 National Design Specification for wood construction.” (1997). American Forest & Paper Association, Washington, D.C.
2.
Breyer, D. E., Fridley, K. J., and Cobeen, K. E. (1999). Design of wood structures, 4th Ed., McGraw-Hill, New York.
3.
Dolan, J. D., Gutshall, S. T., and McLain, T. E. (1995). “Monotonic and cyclic tests to determine short-term load duration performance of nail and bolt connections, Vol. I: Summary report.” Rep. No. TE-1994-001, Timber Engrg. Ctr., Virginia Polytechnic Institute and State University, Blacksburg, Va.
4.
Dolan, J. D., Gutshall, S. T., and McLain, T. E. (1996). “Determination of short-term duration-of-load performance of nailed and bolted connection using sequential phased displacement tests, Vol. I: Summary report.” Rep. No. TE-1994-003, Timber Engrg. Ctr., Virginia Polytechnic Institute and State University, Blacksburg, Va.
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Recommended lateral force requirements and commentary, 6th Ed. (1996). Structural Engineers Association of California (SEAOC) Seismology Committee.
6.
Uniform building code. (1997). International Conference of Building Officials (ICBO), Whittier, Calif.
Information & Authors
Information
Published In
Practice Periodical on Structural Design and Construction
Volume 5 • Issue 1 • February 2000
Pages: 14 - 26
History
Received: Sep 9, 1998
Published online: Feb 1, 2000
Published in print: Feb 2000
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