Modeling of nonlinear stiffness and nonviscous damping in nailed joints between wood and plywood Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cn69m6589

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  • Nailed joints between sheathing and framing in light-frame wood buildings play a vital role in assuring structural safety by providing the stiffness needed to transfer the forces among the building components and the medium of energy dissipation during severe earthquakes and wind storms. However, the exact nature of load transfer and energy dissipation in nailed joints has not been characterized. This investigation was aimed at theoretically and experimentally characterizing the dynamic behavior of typical nailed joints. The theoretical evaluation combined the linear step-by-step analysis and the concept of beam-on-elastic-foundation to model the nonlinear behavior of joints with interlayer gaps. The effect of damping was included by postulating a model with springs and dashpots and then using, experimental data to demonstrate its accuracy. Pseudo-dynamic tests were conducted on four twenty-specimen samples that were matched with respect to their material properties. The samples were tested to determine the nail bearing for wood and plywood, and the behavior of complete joints and joints with gaps. The nail bearing properties were used to formulate a mechanism for stiffness and slip due to wood and plywood crushing which was then verified by comparing its predictions to the results from testing joints with gap. A sensitivity study based on the complete-joint model shows that the slip modulus has the greatest effect on the joint damping. Both, the dissipated and slip work were found to decrease with increasing slip modulus. The rate of decrease is significant at law loads for the submodel of interlayer friction, but not as substantial at high loads. The variation of the slip modulus in wood and plywood affects the rate of decrease the most at high loads. The experimental results show that the traditionally defined equivalent viscous damping significantly underestimates the damping of tight nailed joints, because the assumption of linearity overestimates the slip work. However, for specimens with gap under small loads, the assumption of linear damping results in an accurate damping ratio.
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