Behavior of Timber Joints with Multiple Nails
Publication: Journal of Structural Engineering
Volume 111, Issue 5
Abstract
An attempt was made to study the effect of the number of nails on the stiffness of laterally‐loaded timber joints with interface friction, fabricated with 2–8 nails in a row. A mathematical model was developed to predict the load‐slip behavior of the joints. An experimental program investigated the effect of the number of nails, and some 140 joint tests were conducted, in total, in the present research. The current design concept that a joint fastened together with multiple nails in a row carries a lateral load equal to the product of the lateral capacity of single nail joint, and the number of nails in a row of the joint is somewhat of an overestimation of the overall capacity of the joint. Modification factors are developed to account for the effect of the number of nails in a row on the stiffness of joints with multiple nails. Experiments were also conducted to determine the parameters required for the application of the theoretical model. Frictional forces between the constituent members of joints were observed to be constant for joints with 3–8 nails in a row. The load‐slip curves of tested joints and the corresponding curves obtained from the theoretical model are compared with each other to verify the extent of the validity of the model. The theoretical predictions yield an upper bound solution for all types of joints—seven different types—tested in this research.
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References
1.
Canadian Standards Association, “Timber Fastenings,” Code for Engineering Design in Wood, National Standard of Canada CAN3‐086‐M80, Canadian Standards Association, Rexdale, Ontario, Canada, 1980, pp. 83–120.
2.
Foschi, R. O., “Load‐Slip Characteristics of Nails,” Wood Science, Vol. 7, No. 1, July, 1974, pp. 69–76.
3.
Foschi, R. O., and Bonac, T., “Load‐Slip Characteristics for Connections with Common Nails,” Wood Science, Vol. 9, No. 3, Jan., 1977, pp. 118–123.
4.
Lantos, G., “Load Distribution in a Row of Fasteners Subjected to Lateral Load,” Wood Science, Vol. 1, No. 3, Jan., 1969, pp. 129–136.
5.
Malhotra, S. K., and Thomas, B., “Behavior of Nailed Timber Joints with Interface Characteristics,” Wood Science, Vol. 15, No. 2, Oct., 1982, pp. 161–171.
6.
Thomas, B., “Effect of Interface Characteristics on Load‐Slip Behavior of Nailed Timber Joints,” thesis presented to the Technical University of Nova Scotia, at Halifax, Nova Scotia, Canada, in 1982, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
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Copyright © 1985 ASCE.
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Published online: May 1, 1985
Published in print: May 1985
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