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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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Title: Pilot study to examine use of transverse vibration nondestructive evaluation for assessing floor systems

Source: Forest products journal. Vol. 52, no. 1 (Jan. 2002).:p. 89-93.

Author(s)Cai, Zhiyong. ; Ross, Robert J.; Hunt, Michael O.; Soltis, Lawrence A.

Publication Year: 2002  View PDF »

Category: Journal Articles

Abstract: 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.

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

File size: 166 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 21971
Current FPL Scientists associated with this product (listed alphabetically)
Cai, Zhiyong
Supervisory Research Materials Engineer
Ross, Robert J.
Supervisory Research Gen. Engineer

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