Effect of loading rate on damping and stiffness in nailed joints Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s7526h669

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  • The conventional studies for nailed joints vary and no standard methods exist for evaluation of damping in wood joints. Wood buildings experience earthquake-caused oscillation of three or more Hz, but damping values used in design are based on static test. To evaluate damping at loading rates associated with earthquakes, cyclic-load tests were conducted on single-nail joints of wood and plywood. The investigated loading rates were between the static ASTM rate and sine function of 15 Hz. The results showed that damping ratio increased with the frequency-associated loading rate between the static ASTM rate and 4 Hz, then it gradually decreased as the rate was increased to 15 Hz. Another variable, load level, influenced damping ratio at all rates except for 1 Hz. Observation was also made on nail stiffness: at high load level, slip moduli consistently increased between the static ASTM rate and 15 Hz. At low load level, it increased between the ASTM rate and 2.5 Hz and decreased between 2.5 and 15 Hz. Statistical analysis showed that both, damping ratio and slip modulus weakly correlated with loading rate, while work capacity, dissipated energy and total slip displayed strong correlation.
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