SmartLVL 15 Design Guide - Tilling Timber

STRUTTING BEAM SUPPORTING UNDERPURLINSAS 4055 CLASSIFICATION C1, C2 AND C3Underpurlin'A' = Total ofunderpurlin spans'B' = Total ofrafter spansRoof AreaSupportedEXAMPLE:wind speed = C3sheet roof = 40 kg/m 2total of underpurlin span ‘A’= 5000 mmtotal of rafter span ’B’ = 4200 mmroof area supported = (A/2) x (B/2)= (5000/2) x (4200/2)= 5250000 mm 2 ( Convert to m 2 )= 5250000/1000000 = 5.25 m 2strutting beam span = 4500 mmRoof StrutEnter column at 6 m 2 roof area supported and read down to a span greaterthan or equal to 4500 mmStrutting BeamSpanSTRUTTINGBEAMADOPT:SmartLVL 15 — 2/240x35Roof area supported (m 2 ) 2 4 6 8 10 12Member size DxB(mm)Roof mass(kg/m 2 )Maximum strutting beam span (mm)130x35 20 3050 1650 NS NS NS NS60 2350 1650 NS NS NS NS140x35 20 3400 1900 NS NS NS NS60 2600 1850 NS NS NS NS150x35 20 3750 2150 1100 NS NS NS60 2900 2050 1300 NS NS NS170x35 20 4550 2700 1800 NS NS NS60 3450 2500 1900 NS NS NS190x35 20 5250 3300 2200 1150 NS NS60 4000 2950 2300 1350 NS NS200x35 20 5500 3600 2400 1500 NS NS60 4300 3150 2550 1750 NS NS240x35 20 6600 5050 3350 2500 1550 NS60 5500 4100 3400 2650 1750 10502/120x35 20 3800 3050 2150 1600 NS NS60 2850 2100 1700 1500 NS NS2/130x35 20 4300 3400 2500 1850 1150 NS60 3200 2350 1900 1650 1400 NS2/140x35 20 4800 3750 2850 2150 1700 NS60 3550 2600 2150 1850 1650 NS2/150x35 20 5200 4100 3250 2450 1950 110060 3900 2900 2400 2050 1850 13002/170x35 20 5900 4850 4100 3050 2450 205060 4550 3450 2850 2500 2250 20502/190x35 20 6500 5550 4800 3750 3000 250060 5250 4000 3350 2950 2650 24002/200x35 20 6750 5900 5150 4100 3300 275060 5600 4300 3600 3150 2850 26002/240x35 20 7650 6850 6300 5750 4550 380060 6650 5500 4650 4100 3700 34002/290x35 20 8700 7950 7400 6950 6450 535060 7750 6700 6000 5350 4850 44502/300x35 20 8900 8150 7600 7150 6750 570060 7950 6900 6200 5600 5100 4700SmartLVL 15 Design Guide 72