Effect of Moisture Content on Strength of Bolted Timber Connections

In a study of the effects of moisture content on strength of bolted timber connections, joints of 4-3/4-inch bolts in 2-5/8- by 8-inch center members and 1-5/16- by 8-inch side plates were loaded parallel to the grain. The proportional limit load decreased with increased moisture content. Friction played a significant role in the action of the connections. Seasoning after fabrication loosened the connections, but when the bolts were retightened the connections were as strong as those fabricated from seasoned material. The ratio of proportional limit load to ultimate load and the slope of the loadslip relationship decreased with increased moisture content.

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