Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Agricultural Engineering


This thesis involves the study of the effect of change in moisture content on the load carrying capacity of three member nailed wood joints. New wood truss designs developed today can be tested with truss breaking equipment. Precise structural data on wood joints in extended service conditions are inadequate to justify enthusiasm for design precision. In agricultural construction and other utility buildings, wood-nailed trusses are extensively used because of their simplicity and economy. The weakest and most unpredictable parts of a nailed-wood truss are likely to be in the joints. Thus, the logical point for design improvement is the joint. As a structural medium, wood is as variable as it is versatile. A study of wood must include or account for the variables present and their interactions. Some of the variables affecting the strength of nailed-wood joints are as follows: strength of the wood members, which is some function of the species, its specific gravity and moisture content, character and duration of loads, service environment. The most obvious factor which cannot be accounted for with truss testing equipment is the service environment.

Library of Congress Subject Headings

Wood -- Moisture


Includes bibliographical references



Number of Pages



South Dakota State University