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Timber Design
Section 4
4-14
FVZ, FVY Allowable horizontal shear stresses.
VZ, VY Shear in local Z and local Y direction.
ZD, YD Depth of section in local Z and Y axis.
EZ, EY Minimum eccentricity along Z and Y axis.
CFZ, CFY CFZ and CFY are values of the size factors in the Z-
axis and Y-axis respectively.
CLZ, CLY CLZ and CLY represent the factors of lateral stability
for beams about Z-axis and Y-axis respectively.
RATIO Permissible ratio of the stresses as provided by the
user. The default value is 1.
Combined Bending and Axial Stresses
Bending and Axial Tension:
The following interaction formulae are checked :
i) f
a
/FA + f
bz
/(FBZ x CFZ) + f
by
/(FBY x CFY) =< RATIO
ii) Lateral stability check with Net compressive stress:
- f
a
/FA + f
bz
/(FBZ x CLZ) + f
by
/(FBY x CLY) =< RATIO
Bending and Axial Compression:
i) f
a
/FA + f
bz
/(FBZ-JZ x f
a
) + f
by
/(FBY-JY x f
a
) =< RATIO
Applicability of the size factor:
a) When CF < 1.00,
if fa > FBZ x (1-CFZ), FBZ is not modified with CFZ. if fa
> FBY x (1-CFY), FBY is not modified with CFY.
if fa < FBZ x (1-CFZ) FBZ is taken as FBZ x CFZ + fa but
shall not exceed FBZ x CLZ
if fa < FBY x (1-CFY) FBY is taken as FBY x CFY + fa
but shall not exceed FBY x CLY