SmartLam GL17C Brochure - Tilling Timber
SmartLam GL17C Brochure - Tilling Timber
SmartLam GL17C Brochure - Tilling Timber
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STRUTTING BEAM SUPPORTING UNDERPURLINS<br />
AS 4055 CLASSIFICATION N1, N2 AND N3<br />
EXAMPLE:<br />
Underpurlin<br />
'A' = Total of<br />
underpurlin spans<br />
'B' = Total of<br />
rafter spans<br />
wind speed = N3<br />
sheet roof = 20 kg/m 2<br />
total of underpurlin span ‘A’= 5000 mm<br />
total of rafter span ’B’ = 4200 mm<br />
roof area supported = (A/2) x (B/2)<br />
= (5000/2) x (4200/2)<br />
= 5250000 mm 2 ( convert to m 2 )<br />
= 5250000/1000000 = 5.25 m 2<br />
Roof Area<br />
Supported<br />
strutting beam span = 4500 mm<br />
Roof Strut<br />
Enter column at 6m 2 roof area supported and read down to a<br />
span greater than or equal to 4500 mm<br />
Strutting Beam<br />
Span<br />
STRUTTING<br />
BEAM<br />
ADOPT:<br />
<strong>SmartLam</strong> GL17 - 195 x 65<br />
Roof area supported (m 2 ) 2 4 6 8 10 12<br />
Member size<br />
DxB (mm)<br />
Roof mass<br />
(kg/m 2 )<br />
Maximum Strutting beam span (mm)<br />
130x65 20 4100 3700 2450 1800 1450 1200<br />
60 3650 2550 2050 1650 1350 1100<br />
165x65 20 5250 5050 3950 2950 2350 1950<br />
60 5000 3750 3000 2600 2150 1800<br />
195x65 20 6200 5950 5550 4150 3300 2750<br />
60 6050 4750 3950 3400 3000 2500<br />
230x65 20 7300 7050 6750 5800 4600 3850<br />
60 7300 5750 4950 4450 3950 3500<br />
260x65 20 8250 7950 7700 7050 5900 4900<br />
60 8250 6650 5700 5150 4700 4350<br />
295x65 20 9350 9000 8700 8250 7600 6350<br />
60 9350 7800 6650 5950 5450 5100<br />
330x65 20 10450 10100 9750 9450 8750 7850<br />
60 10450 9000 7700 6850 6250 5850<br />
360x65 20 11400 11000 10650 10350 9850 9150<br />
60 11400 10100 8600 7650 7000 6500<br />
395x65 20 11950 12000 11700 11350 11000 10400<br />
60 12000 11450 9800 8700 7900 7350<br />
425x65 20 10400 10950 11900 12000 11850 11550<br />
60 11200 12000 10850 9600 8750 8100<br />
460x65 20 9850 10150 10450 10900 11400 12000<br />
60 10250 11200 12000 10800 9800 9050<br />
495x65 20 9550 9750 9950 10200 10500 10800<br />
60 9800 10400 11150 12000 10900 10050<br />
130x85 20 4500 4350 3200 2400 1900 1600<br />
60 4150 2950 2400 2050 1750 1450<br />
165x85 20 5700 5500 5050 3900 3100 2550<br />
60 5500 4250 3500 3000 2650 2350<br />
195x85 20 6750 6500 6100 5450 4350 3600<br />
60 6600 5250 4500 3900 3500 3150<br />
230x85 20 8000 7700 7350 6700 6050 5050<br />
60 8000 6350 5450 4900 4550 4100<br />
260x85 20 9000 8700 8400 7750 7150 6450<br />
60 9000 7350 6300 5700 5200 4850<br />
295x85 20 10250 9850 9550 9050 8350 7850<br />
60 10250 8600 7400 6600 6050 5650<br />
330x85 20 11450 11050 10650 10350 9650 9050<br />
60 11450 9900 8550 7650 7000 6500<br />
360x85 20 12000 12000 11650 11300 10850 10150<br />
60 12000 11100 9600 8550 7800 7250<br />
395x85 20 11450 12000 12000 12000 12000 11500<br />
60 12000 12000 10850 9700 8850 8200<br />
425x85 20 10300 10650 11150 12000 12000 12000<br />
60 10800 12000 12000 10750 9800 9050<br />
460x85 20 9800 10000 10250 10500 10800 11200<br />
60 10100 10700 11700 12000 11000 10150<br />
495x85 20 9500 9650 9800 10000 10150 10350<br />
60 9700 10100 10600 11200 12000 11300<br />
525x85 20 9350 9450 9600 9700 9850 10000<br />
60 9500 9800 10150 10550 11050 11750<br />
560x85 20 9200 9300 9400 9500 9600 9700<br />
60 9350 9550 9800 10100 10450 10850<br />
590x85 20 9100 9200 9250 9350 9450 9550<br />
60 9200 9400 9650 9850 10100 10400<br />
<strong>SmartLam</strong> GL17 Design Guide 47
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