Fig
1 Box beam
Fig 2 "I" beam
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Plywood Webbed Beams -
Product Types and Applications
Plywood webbed beams can
be manufactured in three basic profiles: -
- Box-Beams.
Box-beams are the most common webbed beams in
use. They have high strength and stability, light
weight and simple fabrication requirements. A
typical box-beam is shown in Figure 1. Box-beams
are readily used in domestic, industrial,
agricultural and commercial applications. Their
structural form may be as a simple beam, special
shape beams (e.g. tapered or curved top flange)
or as complete portal frame elements.
- "C"-Beams
(Channel Beams). Plywood webbed beams in a
"C" section profile are not as common
as box-beams. They are used as lintels in
domestic applications and as roofing purlins in
industrial and agricultural structures. Spans of
up to 10 m have been achieved with "C"
section roof purlins using simple on-site nailed
fabrication.
- "I"-Beams.
Plywood webbed "I" beams rely on a high
strength glued connection between the web and
flanges This necessitates factory controlled
finger jointing, glue mixing and curing
techniques. The span capabilities of
"I" beams range up to approximately
20m. A typical "I" beam is shown in
Figure 2.
Reference: Timber Datafile
P9 – Manufactured Structural Timber Products of the
NAFI Timber Manual
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