Static and Dynamic Properties of Glued Wood-Joist Floors

Tests were conducted on four wood-joist floors to determine the effect that gluing plywood subfloor to the joists with an elastomeric adhesive has on static strength and stiffness, vibration frequency, and damping capacity. Also, an analytical procedure was used to study the effect of gluing on the range of natural frequency of the floor. A special rating procedure, was applied to establish the effect of gluing on acceptability of floors with respect to human response to vibration. Gluing plywood subfloor to the joists produced stronger and stiffer floors than did nailing alone, but the distribution of a concentrated load in the direction perpendicular to the floor span was not changed. Natural frequency and damping capacity changed little as a result of the glue application, but the glued floor, was more acceptable with respect to human response to vibration than its nailed-only counterpart. A nailed-only floor and its glued counterpart were vibrated in a horizontal direction to give dynamic parameters of floors acting as diaphragms. Gluing caused a slight increase in natural frequency, but decreased the damping capacity.

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