Combined Load Capacity of Threaded Fastener‐Wood Connections
Publication: Journal of Structural Engineering
Volume 116, Issue 9
Abstract
Threaded fastener‐wood connections using lag screws, wood screws, and the like are commonly loaded with forces having components both parallel and perpendicular to the fastener axis. Metal side plate‐to‐wood connections with a single fastener are tested in pure withdrawal loading (90°), pure lateral loading (0°), and loading at 22.5° increments between the two extremes. Two sizes of standard lag screws and one size tapping screw are tested with southern pine and spruce‐pine‐fir main members. The experimental results show that relatively small deviations from pure lateral or pure withdrawal loading may be conservatively ignored. There is minimal interaction between lateral and withdrawal components of the maximum capacity of lag screw connections. Design values are derived by applying different safety factors to either the test, load at a limiting lateral deformation or the ultimate withdrawal load. An interpolation function such as Hankinson's formula or a second‐order interaction conservatively describes the effect of load angle on computed allowable loads.
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References
1.
American Institute of Timber Construction. (1985). Timber construction manual. John Wiley and Sons, New York, N.Y.
2.
Bodig, J., and Jayne, B. A. (1982). Mechanics of wood and wood composites. Van Nostrand Reinhold Co., New York, N.Y.
3.
Carroll, J. D. (1988). “Withdrawal and combined load capacity of threaded fastenerwood joints.” Thesis presented to the Virginia Polytechnic Institute, at Blacksburg, Va., in partial fulfillment of the requirements for the degree of Master of Science.
4.
Crubilé P., et al. (1988). “EUROCODE no. 5: Common unified rules for timber structures.” Commission of the European Communities, Brussels, Belgium.
5.
DeBonis, A. L., and Bodig, J. (1975). “Nailed wood joints under combined loading.” Wood Sci. and Tech., 9(2), 129–144.
6.
Ehlbeck, J. (1985). “Load‐carrying capacity of nailed joints under combined shear and withdrawal forces.” Versuchsanstalt fur Stahl, Holz, und Stein, Dept. Ingenieurholzbau, Univ. of Karlsruhe, Karlsruhe, W. Germany.
7.
Gebremedhin, K. G., and Irish, W. W. (1985). “Ultimate load deflection characteristics and failure modes of ceiling diaphragms for farm buildings.” Wood and Fiber Sci., 18(4), 565–578.
8.
Kulak, G., Fisher, J., and Struik, J. H. A. (1987). A guide to design criteria for bolted and riveted joints. 2nd Ed., John Wiley and Sons, New York, N.Y.
9.
Mall, S., Murphy, J. F., and Shotttafer, J. E. (1983). “Criterion for mixed mode fracture in wood.” J. Engrg. Mech., 109(3), 680–690.
10.
Munse, H., and Cox, H. J. (1956). “The static strength of rivets subjected to combined tension and shear.” Engrg. Expt. Sta. Bulletin, 437, Univ. of Illinois, Urbana, Ill.
11.
National design specifications for wood construction. (1986). Nat. Forest Prods. Assn., Washington, D.C.
12.
“Square and hex bolts and screws—Inch series.” (1981a). ANSI/ASME B18.2.1‐1981, Amer. Soc. of Mech. Engrs., New York, N.Y.
13.
“Thread forming and thread cutting tapping screws and metallic drive screws (inch series).” (1981b). ANSI/ASME B18.6.4‐1981, Amer. Soc. of Mech. Engrs., New York, N.Y.
14.
Wood handbook: Wood as an engineering material. (1987). U.S.D.A. Handbook No. 72, Gvt. Printing Office, Washington, D.C.
15.
Zahn, J. J. (1982). “Strength of lumber under combined bending and compression.” U.S.D.A. Forest Products Lab. Res. Paper FPL 391, U.S.D.A., Madison, Wis.
16.
Zarembski, A. M. (1988). “Vehicle dynamics and track buckling.” Railway Track & Structs., 84(2), 12.
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Copyright © 1990 ASCE.
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Published online: Sep 1, 1990
Published in print: Sep 1990
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