SECTION 3
TIMBER
ENGINEERING
In designing timber members, the following references are often used: Wood Handbook,
Forest Products Laboratory, U.S. Department of Agriculture, and National Design Speci-
fication for Stress-Grade Lumber and Its Fastenings, National Forest Products Associa-
tion. The members are assumed to be continuously dry and subject to normal loading con-
ditions.
For most species of lumber, the true or dressed dimensions are less than the nominal
dimensions by the following amounts:^3 A in (9.53 mm) for dimensions less than 6 in
(152.4 mm); l/2 in (12.7 mm) for dimensions of 6 in (152.4 mm) or more. The average
weight of timber is 40 lb/ft^3 (6.28 kN/m^3 ). The width and depth of the transverse section
are denoted by b and d, respectively.
Bending Stress and Deflection of Wood Joists
Shearing Stress Caused by Stationary Concentrated Load
Shearing Stress Caused by Moving Concentrated Load
Strength of Deep Wooden Beams
Design of a Wood-Plywood Beam
Determining the Capacity of a Solid Column
Design of a Solid Wooden Column
Investigation of a Spaced Column
Compression on an Oblique Plane
Design of a Notched Joint
Allowable Lateral Load on Nails
Capacity of Lag Screws
Design of a Bolted splice
Investigation of a Timber-Connector Joint3.2
3.2
3.3
3.3
3.4
3.6
3.6
3.7
3.8
3.8
3.9
3.10
3.10
3.11