SmartLam GL18C Brochure - Tilling Timber
SmartLam GL18C Brochure - Tilling Timber
SmartLam GL18C Brochure - Tilling Timber
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INSTALLATION (cont’d)<br />
diameter of the hole. For example, a 25 mm hole drilled in a<br />
150 mm wide beam would reduce the capacity of the beam at<br />
that section by ¼. For this reason, where it is necessary to drill<br />
vertical holes through a Glulam member, the holes should be<br />
positioned in areas of the member that are stressed to less<br />
than 50% of the design in bending.<br />
Holes for support of heavy equipment - Heavy equipment or<br />
piping suspended from Glulam should be attached so that the<br />
load is applied to the top of the member to avoid tension perpendicular<br />
to the grain stresses. Any horizontal holes required<br />
for support of significant weight, such as suspended heating<br />
and cooling units or main water lines, must be located above<br />
the neutral axis of the member and in a zone stressed to less<br />
than 50% of the design flexural stresses.<br />
Figure 2 - Zones where horizontal holes are permitted in a uniformly loaded simply supported beam<br />
L/8<br />
.<br />
L/8<br />
.<br />
Span = L<br />
L/2<br />
L/8<br />
L/8<br />
D/4<br />
High Flexure Zone<br />
High Shear zone<br />
High Shear zone<br />
D/2<br />
High Flexure Zone<br />
Zones where horizontal Holes are permitted<br />
Zones where Horizontal Holes for Load-Bearing Fasteners are permitted<br />
D/4<br />
BIRDS MOUTHING<br />
Figure 3 - Birds mouthing details for <strong>SmartLam</strong> GL18<br />
EAVES OVERHANG<br />
Figure 4 - Eaves over hang details for <strong>SmartLam</strong> GL18<br />
BEAM TO BEARING DETAILS<br />
Minimum depth of<br />
embedment = D/2<br />
Can cause splitting<br />
due to induced<br />
tension perpendicular<br />
to the grain stresses,<br />
reduces shear strength<br />
and rapid drying due to<br />
exposed end grain<br />
40 50<br />
CORRECT<br />
IN-CORRECT<br />
D<br />
M10 galvanised<br />
coach screws<br />
Overhang<br />
Note:<br />
Refer to AS 1684 Residential timber-framed construction code for overhang member size.<br />
Allowable Eaves overhangs<br />
1. Non Cyclonic Areas<br />
a. Beams for flat or similar roofs - Not birds mouthed:<br />
<br />
Eaves overhang shall not exceed 40% of the actual<br />
beam span.<br />
b. Beams with conventional pitched roofs - birds mouthed<br />
to one third their depth:<br />
<br />
<br />
Sheet roof - 20% of actual beam span<br />
Tiled roof - 30% of actual beam span<br />
2. Cyclonic Areas<br />
Recommendations as per above, but reduced as follows:<br />
Non birds mouthed - 25% of actual beam span<br />
birds mouthed-<br />
Sheet roof - 10% of actual beam span<br />
Tiled roof - 20% of actual beam span<br />
<strong>SmartLam</strong> G18C Design Guide 5