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Pilot study to examine use of transverse vibration nondestructive evaluation for assessing floor systemsAuthor(s): Zhiyong Cai; Robert J. Ross; Michael O. Hunt; Lawrence A. Soltis
Source: Forest products journal. Vol. 52, no. 1 (Jan. 2002).:p. 89-93.
Publication Series: Miscellaneous Publication
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DescriptionEvaluation 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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CitationCai, 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.
KeywordsFloors, Building timbers, Nondestructive testing, Vibration, Wood properties, Joists, Transverse vibration
- Low frequency vibration approach for assessing performance of wood floor systems
- Static and vibration moduli of elasticity of salvaged and new joists
- Assessment of in-place wood floor systems
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