ARCH 2044 Chapter Notes - Chapter 4: Oriented Strand Board, Real Versus Nominal Value, Lumber
25 Oct 2016
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Strong, durable, light in weight, and easy to work. Two major classes of wood: softwood + hardwood (these terms are not descriptive of the actual hardness, softness or strength of wood): Softwood - wood from any of the various predominantly evergreen, cone-bearing trees. a. b. c. Used for general construction pine, fir, hemlock, and spruce. Hardwood - wood from a broad-leaved flowering tree a. b. c. Used for furniture, flooring, paneling, and interior trim. Tensile and compressive forces are best handled by wood in a direction parallel to the grain a. b. Typically, a given piece of wood will withstand 1/3 more force in compression than in tension parallel to its grain. Allowable compressive force perpendicular to its grain is only about 1/5 - 1/2 of the allowable compressive force parallel to the grain. Tensile forces perpendicular to the grain = split. The shear strength of wood is greater across its grain than parallel to the grain a.
