Glulam
Definitions |
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Bending
Members
--- Members that are stressed principally in bending such as beams,
girders and purlins.
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Bond Line
--- The
layer of adhesive which attaches two adherents.
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Bonded
Assembly of
Laminations --- A bonded member intended to be bonded to other
assemblies or other laminations to form a completed glued laminated
member.
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Camber
--- The
small amount of curvature built into a glued laminated timber to offset
anticipated deflection or to facilitate roof drainage.
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Compression
Members
--- Members that are stressed principally in axial compression such as
columns, compression chords of trusses, and arches.
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Curing
Time ---
The period of time which an adhesive takes to attain a specified degree
of cure.
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Curved
Members
--- Members which are designed so that significant curvature remains
after deflection due to service loads has taken place, such as curved
beams and arches.
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Custom
Members
--- Members that are manufactured to meet specific job specifications.
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Delamination
---
The separation of layers in an assembly because of failure of the
adhesive, either in the adhesive itself or at the interface between the
adhesive and the lamination.
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Depth
--- The
cross-sectional dimension which is measured parallel to the direction
of the principal load on the member in bending.
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Dry
service conditions
--- Environmental exposure conditions that result in a member moisture
content of less that 16% in service.
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Eased
Corner ---
Slightly rounded surfacing of corner of member to remove sharp edge.
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Equilibrium
Moisture
Content --- Any piece of wood will give off or take on
moisture from the surrounding atmosphere until the moisture in the wood
comes to equilibrium with that in the atmosphere. The moisture content
of the wood at the point of balance is called the equilibrium moisture
content and is expressed as a percentage of the oven-dry weight of the
wood.
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E-Rated
Lumber
--- Lumber that has been non-destructively tested to determine the
modulus of elasticity.
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Gap-Filling
Adhesive
--- An adhesive that has the capability of filling voids of up to 1/16
in between two mating surfaces and possesses the required strength and
durability.
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"Green"
Building
--- The use of renewable, environmentally friendly and sustainable
products delivered from local sources to provide energy efficient and
cost effective construction.
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Inserts
--- Wood
strips inserted in the sides and faces of glued laminated timber.
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Joint,
Edge ---
The joint formed by two or more pieces of lumber laid edge to edge to
form a full width lamination.
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Joint,
End --- A
joint formed by joining pieces of lumber end to end with adhesives.
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Joint,
Face ---
The joint occurring between the wide faces of laminations.
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Joint,
Finger ---
An end joint made up of several meshing fingers of wood.
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Joint,
Scarf ---
An end joint formed by joining with adhesive the end of 2 pieces that
have been tapered to form sloping plan surfaces. In some cases, a step
or hook is machined into the scarf to facilitate alignment of the 2
ends, in which case, the plane is discontinuous and the joint is known
as a stepped or hooked scarf joint.
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Laminated
Veneer Lumber
--- Lumber made by laminating veneers in which the grain of all the
veneers is essentially parallel to the longitudinal axis of the piece.
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Laminating
---
The process of bonding selected lumber or wood veneers together with
adhesive.
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Lamination
--- A
full width and full length of wood composed of one or several pieces of
lumber in width or length.
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Machine
Stress Rated
(MSR) Lumber and Machine Evaluated Lumber (MEL) --- Lumber that has
been evaluated by mechanical stress-rating equipment and includes a
strength test for qualification. This lumber is also required to meet
certain visual requirements as set forth in the grading rules.
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Manufactured
Lumber
--- Two or more pieces or strips of lumber structurally bonded to form
a single piece of lumber. It is intended primarily for tension
laminations.
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Mechanically
Graded Lumber
--- the result of a process using mechanical or physical evaluation,
combined with visual grading, to sort lumber into categories for the
assignment of design properties. Mechanically graded lumber includes
E-rated, machine stress rated (MSR), and machine evaluated lumber (MEL).
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Moisture
Content
--- The amount of water contained in the wood, usually expressed as a
percentage of the weight of oven-dry wood.
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Multiple-Piece
Lamination
--- A lamination which contains 2 or more pieces of lumber across the
width of the lamination. The edges may or may not be bonded. If not
bonded, the edge joints in adjacent laminations must be staggered at
least the net thickness of the lamination.
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Non-custom
Member
--- Members that are not manufactured for a specific job specification.
These are commonly called stock beams.
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Proof
Loading ---
Application of a known load to a lamination, either tension or bending.
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Proof
Grading ---
Grading of lumber by strength testing of each piece in tension to a
predetermined level in order to endure single member performance.
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Relative
Humidity ---
The ratio of actual pressure of existing water vapor to maximum
possible pressure of water vapor in the atmosphere at the same
temperature, expressed as a percentage.
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Ripping
--- The
process of sawing any width lumber to develop narrower lumber.
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Structural
Glued Laminated
Timber --- An engineered, stress rated product comprised of
specially selected and prepared wood laminations securely bonded
together with adhesives. The grain of all laminations is approximately
parallel longitudinally. The laminations may be comprised of pieces end
joined to form any length, of pieces placed or bonded edge-to-edge to
make wider ones or pieces bent to curved form during bonding.
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Tension
Members
--- Members that are stressed principally in axial tension, such as the
tension chords in trusses and tension tie members.
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Wet-service
conditions
--- Environmental exposure conditions that result in a member moisture
content of 16% or greater in service.
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Wet-use
adhesives
--- Adhesives that comply with ASTM D2559.
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Width
--- The
cross-sectional dimension which is measured perpendicular to the
direction of the principal load on the member in bending.
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Wood
Failure ---
That portion of a bonded surface which, in cyclic delamination or
strength tests, exhibits ruptured wood fiber as opposed to failure at
the bond line.
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