Strength of Nailed Wood Joints Subjected to Dynamic Load

Design criteria for lateral resistance of nailed joints are based on static load tests, whereas earthquake and wind produce dynamic loads on structures. This study compares lateral nail resistance determined by static and cyclic loading to determine if static load design criteria apply to dynamically loaded structures. Two joint configurations were tested dynamically at 1- and 10-Hz cyclic frequency and compared to static tests. The two configurations consisted of a Douglas-fir lumber main member connected by a single nail to either a plywood or Douglas-fir lumber side member. The comparisons indicate that at small deformations the increase in joint capacity due to higher rate of loading is offset by decreased joint capacity due to load cycling. At large deformations and numbers of load cycles, joint resistance decreases.

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