Multiple fastener joints

Multiple fastener joints

Date Published

10 August 2022

Document Type

Category

Author

TRADA

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Summary

Joints in structural timberwork are commonly made with a variety of mechanical fasteners such as nails, screws, bolts or steel dowels. A number of fasteners arranged in one or more lines form a multiple fastener joint. The load-carrying capacity of such a joint depends on the strength of both the timber and the fasteners.

Standard tests on joint specimens involving a single fastener provide information on the embedding strength of the timber and tests on fasteners provide information on the bending strength of the fastener.

Key Information

This unit explains how a multiple fastener joint is formed. The sum of capacities of individual fasteners may not be equal to the actual capacity exhibited by the multiple fastener joints, for a variety of reasons. Splitting of timbers in multiple fastener joints were considered, along with the effects of along-the-grain loads and perpendicular-to-grain loads. General recommendations to form multiple fastener joints were given.