A simulation study was conducted to investigate the effect of the coefficient of variation of the modulus of elasticity (Omega(E)) on the predicted vibrational performance of joist floor systems. Four floor cases were studied and two types of lumber were considered: MSR and VSR lumber where Omega(E) is 0.11 and 0.25, respectively, as defined by the National Design Specification (NDS) (1). The predicted floor vibrational performance of MSR versus VSR lumber joists with and without load sharing included in the analyses was evaluated by: 1) the probability that the fundamental frequency is less than 10 Hz; and 2) the ratio of the first percentile of predicted fundamental frequency of MSR to VSR lumber. Overall, MSR lumber (Omega(E) = 0.11) floor systems exhibited improved predicted vibrational performance over VSR floor systems (Omega(E) = 0.25) based on the two measures of floor performance studied.
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