Bowing in Roof Joists Induced by Moisture Gradients and Slope of Grain PDF Download
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Author: R. L. Tuomi
Publisher:
ISBN:
Category : Roofing
Languages : en
Pages : 18
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Book Description
Author: R. L. Tuomi
Publisher:
ISBN:
Category : Roofing
Languages : en
Pages : 18
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Book Description
Author: Roger L. Tuomi
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
During winter months many houses constructed with flat or low-pitched roofs have exhibited upward bowing deflections of 5/8 to 3/4 inch at midspan causing a separation between ceiling and partitions. Where the problems exist, a definite moisture gradient across the depth of the roof joist has been measured in the field. Wood has a very low shrinkage coefficient in the longitudinal direction which is essentially parallel to the axis of the lumber. Its magnitude is far too low to account for the bowing deflections recorded in actual houses. However, shrinkage values in the radial or tangential direction are 50 to 80 times greater than the longitudinal. Any significant slope of grain produces shrinkage components from the tangential and radial direction relative to the axis of the member. Twenty-six specimens of three different species were cut with varying slopes of grain. A moisture gradient was created across the depth of the specimen and bowing deflections were observed. Relationships between bowing deflection and grain angle were established. The magnitudes of observed deflections agreed with those measured in the field. (Author).
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Category :
Languages : en
Pages :
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Author:
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ISBN:
Category : Forest products
Languages : en
Pages : 628
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Author: Forest Products Laboratory (U.S.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 540
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ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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Author: R.B. Keey
Publisher: Springer Science & Business Media
ISBN: 3642596533
Category : Technology & Engineering
Languages : en
Pages : 331
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Book Description
At present, no single book adequately covers a basic understanding of wood book satisfies the need for such a work. It describes drying in practice. This the fundamental basis of kiln-drying technology, to enable forest companies to imFrove their drying operations as high-quality timbers become scarcer and of yesteryear can no longer be tolerated. Adaptive the wasteful practices is no longer good enough. Innovations change based on past experience of the material being dried and the processes require a sound understanding of drying. Newer techniques, such as the use of ultrahigh temperature sea soning and superheated steam under vacuum, require an even greater depth of physical understanding for these methods to be used effectively and economically. book provides a description of modern ideas about wood structure, This moisture movement and stress development, from which models of the drying process are developed to give the kiln operator important information about the course of drying under specified conditions, and thus a means is compared with practice wherever for rational process improvement. Theory possible.
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Category : Forest products industry
Languages : en
Pages : 812
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Author: United States. National Technical Information Service
Publisher:
ISBN:
Category : Building materials
Languages : en
Pages : 288
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Author:
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 946
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