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Timber Design
Section 4
4-6
Assigning the input
Please see the Graphical User Interface manual for the procedure
for assigning the properties, glulam types and material constants.
Design parameters
The timber design parameters for the AITC 4
th
Edition are listed
below.
Table 4.1 - AITC 1994 Timber Design Parameters
Parameter
name
referred
to in
AITC
1994 code
document
Name
used in
STAAD
Default
value and
units if
applicable
Description
C
b
CB 1.0 Bearing Area Factor, Table 4.13
C
F
CFB 1.0 Size Factor for Allowable Bending Stress, see
Table 8.3, 8.4, 8.5, 8.6, 8.7
C
F
CFC 1.0 Size Factor for Allowable Compression Parallel
to Grain, see Table 8.3, 8.4, 8.5, 8.6, 8.7
C
F
CFT 1.0 Size Factor for Allowable Tension Parallel to
Grain, see Table 8.3, 8.4, 8.5, 8.6, 8.7
C
fu
CFU 1.0 Flat Use Factor, see Table 4.9
C
H
CSS 1.0 Shear Stress Factor, Section 4.5.14
C
M
CMB 1.0 Wet service Factor for Allowable Bending
Stress, see Table 4.8
C
M
CMC 1.0 Wet service Factor for Allowable Compression
Parallel to Grain, see Table 4.8
C
M
CME 1.0 Wet service Factor for Modulus of Elasticity,
see Table 4.8
C
M
CMP 1.0 Wet service Factor for Allowable Compression
Perpendicular to Grain, see Table 4.8
C
M
CMT 1.0 Wet service Factor for Allowable Tension
Parallel to Grain, see Table 4.8
C
M
CMV 1.0 Wet service Factor for Allowable Shear Stress
Parallel to Grain, see Table 4.8