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EXPERIMENTAL STUDY OF TIMBER TRUSSES
AND JOINTS
By H. C. Foo~
.
d ABSTRACT: In situ testing of a timber Warren truss building and laboratory testing
e
v
r of four truss joints typical of those found in a Warren truss building are carried
e
s out over a span of five years. The overall objective of this research program is to
e
r
s investigatethe behavior of many agingand deteriorating timber Warren truss build-
t
h ings built in early 1940.Field testing involve loading 16 full size timber trusses to
g
i failure to determine their load-carryingcapacities and the effects ofjoint reinforce-
r
l
l ment on the behavior of the trusses. Laboratory testings are performed on the four
a
; biggest joints of a Warren truss in several conditions: cut from an existing truss,
y
l manufactured with new wood, unreinforced condition, reinforced condition using
n
o
e gussetplates, and reinforced conditionby means ofprestressing. Thispaper presents
s an overview of the research program and some of the findings regarding the ef-
u
l fectiveness of the joint strengthening schemes considered.
a
n
o
s
r
e
p
INTRODUCTION
r
o
F
.
E The Department of National Defense (DND) of Canada owns many
C
S hangar-type timber structures on Canadian Forces Bases (CFBs) throughout
A
t the country. The roofs of these structures, mainly used by the military for
h
g
i
r aircraft housing and maintenance, are supported by
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