Some Performance Characteristics of Wood Joist Floor Panels

Floor panels were constructed with 2 by 8-inch joists and with coverings of plywood and particleboard, both alone and in combination. For some panels, adhesive was used to attach coverings to joists and underlayment coverings to subfloor covering. Joist deflections of panels due to a fixed line load were measured before and after application of coverings. Stiffness of joist frames was greatly increased by addition of the panel covering. Increases in stiffness ranged from 47 to 131 percent. Panels with nail-glued coverings resulted in greater increases in stiffness. Resistance of panels to concentrated loads and to impact loads depended on location of load application, type of panel covering, and total thickness of covering. The average frequency of free vibration varied from 14 to 20 Hertz and damping ratios ranged from 2.7 to 8.3 percent of critical.

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