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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Creep of the beam in Japanese conventional structures composed of green and kiln-dried timber II: predictive model for relative deflections  [2006]

Takeda, Takashi; Arima, Takanori;

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We conducted creep tests to evaluate creep behaviors of conventional Japanese framing (jikugumi) structures as reported in a previous article. We measured beam deflections of two structures: one of them was composed of only green timbers (G) and the other with only kiln-dried timbers (D). Besides the two structures, we prepared green and kiln-dried beams to measure moisture content (MC), weight, and dynamic Young’s modulus (E f) by the longitudinal vibration method. We attempted to predict deflections of beams in the structures by using experimental data for single beam specimens. The proposed simple predictive model was derived from two equations: a relation between MC and equilibrium moisture content calculated with temperature and relative humidity, and a relation between MC change and relative deflection change. Beam deflections were traced for 2.5 years, while the predictions were based on experimental data from loading to the 11th day of the test. It was assumed that sensitivity of deflection change to MC should differ during desorption or adsorption. Although annual cyclic changes were observed in E f, there was no obvious relationship between E f and beam deflection.
From the journal
Journal of wood science
ISSN : 1435-0211

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2018
Volume:
52
Issue:
5
Extent:
383-388
Publisher:
Springer Japan
All titles:
"Creep of the beam in Japanese conventional structures composed of green and kiln-dried timber II: predictive model for relative deflections"@eng
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2018
Volume:
52
Issue:
5
Extent:
383-388
Publisher:
Springer Japan
All titles:
"Creep of the beam in Japanese conventional structures composed of green and kiln-dried timber II: predictive model for relative deflections"@eng