Graduate Thesis Or Dissertation
 

Effect of drying on damping and stiffness of nailed joints between wood and plywood

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  • Wood components, usually assembled in green or semi-dry condition, dry during the initial service life. To evaluate the effect of such drying on joint stiffness and damping, cyclic-load tests were conducted on single-nail joints of wood and plywood that had been exposed to drying cycles. Additional effects studied were the surface condition of lumber and level of cyclic load. Tests showed that the stiffness decreased with load but remained the same for the planed and unplaned surface condition. The surface condition did affect the damping ratio when a tight interlayer contact existed. The effect of load level on damping ratio depended on the drying-produced gap between the lumber and plywood. The results show that the damping ratio and slip modulus were significantly smaller for joints with the gap than for those without it. In a preliminary study the possibility was examined of using a free-vibration test for measuring the damping ratio of nailed joints. No simple arrangement could be devised for a reliable prediction of the ratio.
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