Abstract
Abstract
Results are presented from an experimental investigation
to determine internal stress states perpendicular to grain
in glulam induced by moisture variations. The stresses
are determined by measuring the released strains before
and after cutting. Stress distributions are determined for
specimens seasoned in constant humidity, specimens
exposed to an artificial single climate change, specimens
exposed to cyclic climate change and for specimens
exposed to natural climate outdoors under shelter.
Results for seasoned specimens show that internal
stresses exist in glulam without the presence of moisture
gradients. Stresses in specimens with an induced moisture
gradient become larger when moistening from a specific
climate A to another climate B than when drying
from B to A. Tests in an outdoor sheltered climate show
large variations in strains and stresses. The tensile stress
level in the inner part of the glulam cross section exceeds
the characteristic strength of 0.5 MPa during a period of
approximately 80 days.
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