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    Author(s): Zhiyong Cai; Robert J. Ross; Michael O. Hunt; Lawrence A. Soltis
    Date: 2002
    Source: Forest products journal. Vol. 52, no. 1 (Jan. 2002).:p. 89-93.
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (166 KB)


    Evaluation of existing timber structures requires procedures to evaluate in situ structural members and components. This report evaluates the transverse vibration response of laboratory-built floor systems with new and salvaged joists. The objectives were to 1) compare floor system response to individual member response; 2) examine response sensitivity to location of the forcing function; and 3) compare the response of a floor constructed with new joists to that of a floor constructed with a combination of new and salvaged joists. Several floor systems were constructed from new and salvaged southern pine joists and tested using transverse vibration nondestructive evaluation techniques. The results indicate that joist response, and therefore joist stiffness, can be determined from a system approach with arbitrary location of the impact forcing function. The joist response is greatly dependent on the magnitude and location of the dead load it supports. The frequency of the floor system was reduced when salvaged joists were included in the system. But, it does not appear that individual degraded joists in the system can be detected from this type of test.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Cai, Zhiyong. ; Ross, Robert J.; Hunt, Michael O.; Soltis, Lawrence A. 2002. Pilot study to examine use of transverse vibration nondestructive evaluation for assessing floor systems. Forest products journal. Vol. 52, no. 1 (Jan. 2002).:p. 89-93.


    Floors, Building timbers, Nondestructive testing, Vibration, Wood properties, Joists, Transverse vibration

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