Stiffness of nailed OSB-to-lumber connections
1994
Mohammad, M.A.H. | Smith, I.
The influences of moisture conditioning on the load-slip responses of selected types of single shear nailed oriented strandboard (OSB)-to-lumber joints are discussed. At the time of joint fabrication, lumber was in green or dry (15% moisture content (MC)) state and the OSB was In a dry (3% MC) state. Sets of 10 specimens were tested 24 hours after fabrication or following conditioning to one of four new "moisture conditions." For each of the nine alternative moisture histories, specimens were subjected to one of five short-term load cycling regimes. A total of 600 specimens were tested. The load-slip data show that both the MC of lumber at the time of joint fabrication and the MCs of jointed materials at test have strong influences on specimen load-slip responses. Joint secant stiffness responses differ by up to two- to threefold for the same moisture condition at test, depending on whether the joint was fabricated with dry or green lumber. Specimens fabricated with either dry or green lumber and conditioned to a lower lumber MC at test showed a considerable reduction in the joint secant stiffness response compared with specimens tested 24 hours after fabrication. Factors such as the orientation of the wafers in the surface layers of the OSB member and the "load path" during load cycling have secondary influences on the stiffness responses of the types of nailed connections studied.
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