The stress concentration factors at butt joints in six-ply laminated
lumber were determined experimentally. Concentration factors
for a uniform tensile stress were found for a joint at each of
three possible locations.
Four experimental techniques were used and evaluated on actual
wood specimens: strain gages, brittle lacquer, moiré grids, and...
The successful air seasoning of lumber and other wood products depends largely upon the correct handling of stock from the time it leaves the saw until it reaches a moisture content suitable for use.
The following points summarize the general rules for laying out the yard end piles, for piling,...
Published February 1992. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published September 1995. A more recent reprint exists. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published September 1995. Reviewed August 2016. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
In order to describe long term creep behavior of structural lumber in a natural
environment, a bending test with twenty Douglas-Fir beams subjected to a constant
load was set up in an open shed in the Forest Research Laboratory at Oregon State
University. Deflections of the beams were measured along...
The conventional method for determining lumber strength depends
on visual evaluation by lumber graders which often results in
undergrading of lumber. Nondestructive proof testing is used less
often and provides for only estimates of elastic moduli of elasticity
and rupture. The evaluation of nondestructive variables such as
proportional limit (PL)...
New technology allows the production of thinner kiln sticks
manufactured of phenolic resin impregnated paper which are both
structurally and economically realistic. This project tested the effects
of kiln stick thicknesses on dry kiln air circulation and on
lumber drying degrade.
Three variables, stick thickness (3/4, 9/16, 7/16 and 1/4...
Lumber drying accounts for about 70 percent of sawmill energy
requirements. Significant recovery of energy used to dry lumber
would result in significant energy recovery for the mill. This is
desirable because of today's high cost of energy. The objective of
this study was to recover some of the energy...
Forced-air drying of lumber is economically feasible as an aid to sawmills without dry kilns. Reduced cost of shipping more than offsets cost of drying with forced circulation of air. Investment in equipment is small.
In the Willamette Valley, forced-air drying probably can be accomplished successfully throughout the year. High...
The vapor-drying process is described briefly and its present status in industry is discussed. Fairly extensive data on the vapor drying of 1-, 2-, and 4-inch Douglas-fir and 2-inch western hemlock lumber are presented. Exploratory work on the vapor drying of redwood, Pacific madrone, red alder and ponderosa pine is...
Workable log grading systems are needed as aids to marketing timber and other phases of forest management. How can on system be evaluated and compared with other systems. The question of comparisons arose soon after the Western Pine Section of the Forest Service's National Log Grade Project was established in...
This report is one of a series issued in cooperation with the Army Air Forces and the Bureau of Aeronautics under the supervision of the Aeronautical Board.
Many serious 16sses from decay in wooden structures are due to the fact that the timbers used were infected with wood-destroying fungi while in storage. These losses can be greatly reduced by keeping lumber storage yards in a sanitary condition.
The purpose of this study was to derive a set of sampling plans
to be used by the Western Wood Products Association for the reinspection of shipped lumber. Reinspection of a shipment of lumber
occurs when a claim of grade is made by the buyer.
Each sampling plan is derived...