TECHNICAL PAPERS
Dec 1, 1992

Reliability of Bolted Wood Connections

Publication: Journal of Structural Engineering
Volume 118, Issue 12

Abstract

This report analyzes the implied reliability of current practice for the design of bolted wood connections. All U.S. data available to the writer were used. The resistance distribution was taken to be normal, and the coefficient of variation was obtained by pooling data from several sources, as long as the moisture condition, grain direction, side‐plate material, and species were alike. The reliability index for softwood connections is about 5; the index for hardwood connections is about 20% greater than that for softwood connections. A comparative study of data from six sources showed that reliability does not depend upon bolt length‐to‐diameter ratio, and the effects of wood moisture content and side‐plate material (steel or wood) are minimal. Two new codes are briefly examined and compared with current practice. Both of these codes contain radically reformed design criteria for bolted wood connections. The comparison shows that both new codes maintain the present level of reliability.

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References

1.
American national standard minimum design loads for buildings and other structures. (1990). ASCE, New York, N.Y.
2.
Doyle, D. (1963). “Performance of bolted joints in Douglas‐fir.” Research Paper FPL 2, U.S. Dept. of Agric., Forest Service, Forest Products Lab., Madison, Wisc.
3.
Load and resistance factor design for engineered wood construction: A pre‐standard report. (1988). ASCE, New York, N.Y.
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McLain, T. (1981). “Influence of metal side plates on the strength of bolted wood joints.” National Forest Products Association, Washington, D.C. Data used with permission of the NFPA.
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National design specification for wood construction. (1991). Nat. Forest Products Association (NFPA), Washington, D.C.
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“Standard test methods for mechanical fasteners in wood.” (1992). ASTM Standard D 1761‐88, Vol. 04.09, ASTM, Philadelphia, Pa., 303–314.
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Thoft‐Christensen, P., and Baker, M. J. (1982). Structural reliability theory and its applications. Springer‐Verlag, New York, N.Y.
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Trayer, G. W. (1932). “The bearing strength of wood under bolts.” Tech. Bulletin No. 332, U.S. Dept. of Agric, Washington, D.C.
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Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 118Issue 12December 1992
Pages: 3362 - 3376

History

Published online: Dec 1, 1992
Published in print: Dec 1992

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Authors

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John J. Zahn, Member, ASCE
Res. General Engr., U.S. Dept. of Agric, Forest Service, Forest Products Lab., Madison, WI 53705‐2398

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