Primary Causes of Glu-Lam Beam Failures:
from excessive layers of built-up roofing, or the
addition of loads induced by adding roof mounted
mechanical equipment, suspended ceilings or other items
not included in the original design.
- Defects in
material or workmanship, which result in failure under
long term loading conditions. The tension zones of
glu-lam beams located along the bottom of simple-span
portions and on top of the beam in the back-span of the
cantilevered portions, are subject to tension failures
caused by overstress, failures in knots, poor slope of
grain, or improperly installed glue between laminations
- Shear failures
are prevalent near the ends, and at mid-depth of glued
laminated beams. This is primarily due to the fact that
lessor grade lumber is allowed in these areas. Of course,
excessive load is often the most common cause of shear
- Impact from
forklifts. This often occurs in warehouse operations
where the beams are damaged due to the driver's impaired
visibility or carelessness.
- Exposure to
such elements, as extreme heat, moisture, or acqustic
chemicals. Damage to glu-lam beams in heat-treating or
anodizing plants are very common. Poor ventilation in
these types of facilities is a primary cause of failures
in wood beams. Decay is a common problem in freezers or
coolers where vapor barriers are compromised, and
condensation results in trapped moisture, which causes
original design of some glu-lam beams will result in
failures. Note: Because of the large number of failures
in these types of members over the years, the current
Uniform Building Code has reduced the allowable values
for fiber stress in bending in lumber, and has introduced
a volume factor. This new criteria provides for a more
accurate assessment of the true capacity of the material
used in glued laminated beams and wood roof trusses, both
in evaluating the capacity of an existing member, and in
sizing a new member.
& Reinforcement Services for Glued Laminated
- SPS provides
complete visual and physical inspection services,
including documentation of existing "as-built" conditions
and assessment of actual loading conditions.
- Preparation of
inspection reports, photographic documentation, and
engineering calculations to verify capacities of
- Design / Build
Construction proposal with fixed-price estimates for
recommended repairs and reinforcements.
temporary shoring of Glu-Lam Beams to provide a safe
condition for the occupants, as well as to minimize the
potential for the damage to increase. This service is
available on a 24-hour basis.
- SPS will
provide complete engineering services with plans and
specifications for the required beam repairs and
reinforcements. Our experienced staff has developed
proven systems and techniques for specific conditions
over many years. We are pleased to have our designs
reviewed by owners and engineers.
licensed general contractor, SPS Inc. provides complete
construction services related to Glu-Lam Beam repairs. Our
organization is geared to provide prompt, efficient service
to our clients. Our experienced professional field personnel
are fully trained and equipped with specialized tools and
equipment to provide the highest level of skill and
craftsmanship required in this specialized type of
Benefits of the SPS Post
Post-Tension System enables glued laminated beams to
accommodate loads greater than the original design capacity.
Post-Tension Structural Reinforcement and Repair
additional loads such as air conditioning units, new
ceilings, fire sprinklers, and mechanical equipment.
deficiencies in structural fabrication and
ponding of water on beams by eliminating sag along beam
and or purlin lines.
original strength to fire damaged glued-laminated
changes in building codes that previously allowed higher
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