| Laminated Veneer Lumber (LVL):
Structural wood elements constructed of veneers laminated together with their fibers
oriented basically in one direction. Live Load:
This load is applied to a member only temporarily, as with people loads or furniture
loads. These loads may vary with occupancy and are normally listed in the governing codes.
Often snow and construction loads are also classified as live loads.
Loads:
Concentrated: A weight that is applied to a small
area. For convenience, it is a single point for beam calculations, such as the load from a
column.
Distributed: Weights that may vary or are uniformly
applied over a large area. The usual loading that occurs on a warehouse floor is an
example of a distributed load.
Modulus Of Elasticity (MOE): A measurement of the
member's stiffness determined by the ratio of the amount a material will deflect in
proportion to the applied load. A member with a large MOE will deflect less under the
applied load than a member with a smaller MOE when other conditions are equal. MOE is
often referred to as the E value.
Modulus Of Rupture (MOR): A measurement of the
bending stress that occurs in a member when it fails or ruptures under load.
Purlin: A structural framing member designed to
carry loads. It may be used as a joist or rafter and is normally supported by the
principal wall or beam.
Racking Strength: A measure of the ability of a
structure, such as a wall, to withstand horizontal forces or wrenching from side-to-side.
Radius: A dimension that is half the diameter of a
circle. However, it is commonly used as a means of describing the camber requirements in a
glulam beam.
Repetitive Member: One of a series of framing or
supporting members, such as joists or studs, that are framed side-by-side and carry loads
through sheathing or decking. The members must be spaced no more than 24" on center
and shall not be less than three (3) in number.
Side By Side or Staggered Lay-up: Utilizes various
lumber widths layed side by side to develop various finished beam widths. (see page 5.)
Simple Span:
A member that is supported at both outer ends.
"Stock" Glulams: Glulams which are
manufactured to common, standard dimensions and characteristics and kept in distributor's
inventory for immediate job site delivery. (May be cut to customer specified lengths).
Strain: The unit deformation that occurs when a
member is loaded.
Stress: The amount of force applied on a specific
area, usually described in pounds per square inch (psi).
Tension: The force applied to a member in such a
manner as to cause it to be pulled apart or increase in length.
Tension Parallel to Grain:
A measurement of the strength wood when tension is applied
in the same direction as the wood grain.
Tension Perpendicular to Grain:
A measurement of the strength of wood when tension is
applied across the direction of the wood grain.
Top Plate: The structural member on top of a stud
wall on which joists or rafters rest.
Trapezoidal Load: A load which varies uniformly in
magnitude from one location on a member to another location. This can also be referred to
as a tapered load.
Unsupported Length: The distance between the end
supports, or intermediate bracing of a column or beam.
Web:
The vertical component of an "I" shaped member.
Weight: The force with which a body is attracted to
the earth.
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Willamette Industries, Inc. |
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