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Timber Design
Section 4
4-4
3/4” x 30” 24F-V8 DF/DF beam both have an E of 1600 ksi and an
allowable bending stress in the tension zone, F
bx
, of 2400 psi.
Therefore, in STAAD’s glulam database, the section sizes are not
linked to the glulam type. Users may specify any cross-section size
they choose and pick the desired glulam type. The Modulus of
Elasticity and allowable stresses associated with that glulam are
assigned to the member. The material properties for the Glulam
database are taken from Table 1 of AITC 117-93 – Design
Standard Specifications for Structural Glued Laminated Timber of
Softwood Species. This publication has been reproduced in the
AITC 1994 manual starting from page 8-843.
Naming convention in STAAD.Pro for Glulam sections
The STAAD name for glulam sections incorporates
Combination Symbol
Species-Outer Laminations/Core Laminations
Shown here is a typical section listed in page 8-854 of the AITC
manual.
GLT-24F-V11_DF/DFS
Implementation of Material Constants
As explained in the previous paragraphs, for sawn lumber as well
as glulam sections, E is built into the database and gets
automatically assigned to the member along with the section
dimensions. Density, Poisson’s ratio and Alpha (coefficient of
thermal expansion) have to be assigned separately. If they are not
assigned, the analysis engine will use default values for those.
A typical set of input data for section properties and constants is as
shown below.