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A Study of the Strength of Short and Intermediate Wood Columns by Experimental and Analytical Methods

John Edward Parker

出版	University of Wisconsin--Madison, 1963
URL	http://books.google.com.hk/books?id=bec7AAAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

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 Timoshenko's 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 L/d equal to 15 and 20 were determined by Southwell's method. The results that were obtained by Southwell's method agreed very closely with theory for intermediate columns of one species, but were too high for intermediate columns of the other species. (Author).