SmartLVL 15 Design Guide - Tilling Timber

STRUTTING/COUNTER BEAM SUPPORTING UNDERPURLINS &HANGING BEAM AS 4055 CLASSIFICATION C1, C2 AND C3ceiling mass - 20 kg/m 2Underpurlin'A' = Total ofunderpurlin spansCOUNTER/STRUTTINGBEAM'B' = Total ofrafter spansRoof StrutRoof AreaSupportedEXAMPLE:wind speed = C3sheet roof = 40 kg/m 2total of underpurlin span ‘A’= 5000 mmtotal of rafter span ’B’ = 4200 mmroof are supported= (A/2) x (B/2)= (5000/2) x (4200/2)= 5250000 mm 2 ( Convert to m 2 )= 5250000/1000000 = 5.25 m 2total of hanging beam span ’X’ = 4500 mmeffective beam spacing = ‘X’ / 2 = 4500 / 2 = 2250 mmstrutting counter beam span = 4500 mmStrutting CounterBeam SpanHangingBeam'X' = Total ofHanging BeamSpanEnter column at 3600 mm effective beam spacing, 6m 2 roof area supportedand read down to a span greater than or equal to 4500 mmADOPT:SmartLVL 15 — 2/290x35Effective beam spacing (mm) 1800 3600Roof area supported (m 2 ) 2 4 6 8 10 12 2 4 6 8 10 12Member sizeDxB (mm)Roof mass(kg/m 2 )Maximum strutting seam span (mm)150x35 40 2750 1500 NS NS NS NS 2450 1500 1000 NS NS NS75 2350 1600 1050 NS NS NS 2150 1650 1050 NS NS NS170x35 40 3200 1900 1250 NS NS NS 2800 1900 1250 NS NS NS75 2750 2000 1300 NS NS NS 2500 2050 1350 1000 NS NS190x35 40 3600 2300 1500 1150 NS NS 3200 2400 1550 1150 NS NS75 3150 2500 1650 1200 NS NS 2900 2350 1650 1200 NS NS200x35 40 3750 2550 1650 1250 NS NS 3350 2650 1700 1250 NS NS75 3400 2700 1800 1350 NS NS 3050 2550 1800 1350 NS NS240x35 40 4350 3600 2350 1750 1400 NS 3950 3650 2400 1750 1400 NS75 4050 3450 2500 1850 1500 NS 3750 3200 2550 1900 1500 NS2/150x35 40 3550 2950 2300 1700 1350 1100 3150 2750 2300 1700 1350 110075 3100 2450 2100 1800 1450 1200 2850 2350 2000 1800 1450 12002/170x35 40 3950 3450 2900 2150 1700 1400 3600 3200 2850 2150 1700 140075 3600 2900 2500 2200 1800 1500 3300 2750 2400 2150 1850 15002/190x35 40 4300 3850 3550 2600 2100 1750 3900 3600 3300 2650 2100 175075 4000 3400 2900 2600 2250 1850 3700 3150 2800 2500 2250 18502/200x35 40 4450 4050 3700 2900 2300 1900 4100 3750 3500 2950 2300 190075 4150 3600 3100 2750 2450 2050 3850 3400 3000 2700 2450 20502/240x35 40 5150 4700 4350 4050 3200 2650 4700 4350 4100 3900 3250 270075 4800 4250 3850 3550 3250 2850 4450 4050 3700 3450 3150 28502/290x35 40 5900 5500 5100 4850 4550 3750 5400 5100 4800 4600 4400 380075 5600 5000 4600 4250 4000 3800 5150 4750 4400 4150 3900 37502/300x35 40 6050 5600 5250 5000 4750 4000 5500 5200 4950 4750 4550 405075 5750 5150 4700 4400 4150 3950 5300 4850 4500 4250 4050 3850SmartLVL 15 Design Guide 76