Accession Number:

AD0432247

Title:

A STUDY OF THE STRENGTH OF SHORT AND INTERMEDIATE WOOD COLUMNS BY EXPERIMENTAL AND ANALYTICAL METHODS,

Descriptive Note:

Corporate Author:

FOREST PRODUCTS LAB MADISON WIS

Personal Author(s):

Report Date:

1964-01-01

Pagination or Media Count:

45.0

Abstract:

Wood columns of various lengths in two species were evaluated for strength and the results analyzed by several methods. Experimental stressstrain data were obtained over a 6-inch gage length from specimens 10 inches in length. The data thus obtained were used to predict buckling loads given by the tangent modulus theory. In one species, the average experimental results for short and intermediate columns of the grade used agreed very closely with the tangent modulus predictions. In the other species, average experimental results went above tangent modulus predictions for the short columns and below for the intermediate columns. Several analytical approximations were developed to predict tangent modulus buckling loads. The Ramberg-Osgood equation for stress versus strain and Timoshenkos equation for tangent modulus versus strain yielded satisfactory results. A hyperbolic equation for stress versus strain did not yield satisfactory results. The approximate theoretical tangent modulus buckling loads of the columns with Ld equal to 15 and 20 were determined by Southwells method. The results that were obtained by Southwells method agreed very closely with theory for intermediate columns of one species, but were too high for intermediate columns of the other species. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE