SmartLVL 15 Design Guide - Tilling Timber

SmartSplay 15 STRUTTING/COUNTER BEAMS SUPPORTINGUNDERPURLINS AND HANGING BEAMSAS 4055 WIND CLASSIFICATION N1, N2 & N3NOTESSmartLVL Roof VoidStrutting/CounterBeamL = TotalRafter SpanStrutting BeamSpanUnderpurlinWACeiling JoistHanging BeamSpan H1Hanging BeamSpan H2B = Total spanof UnderpulinRoof Areasupported =L/2 x B/2Hanging BeamEXAMPLE:single spansheet roofstrutting/counter beam span = 3500 mmtotal of underpurlin span B = 4.5 mtotal of rafter span L = 4.0 mtotal of hanging beam span = H1 + H2 = 4500 mmroof area supported = L/2 x B/2 = (4/2) x (4.5/2) = 4.25 m 2average hanging beam span = (H1 + H2)/2 = 4500/2 = 2250 mmEnter table at 2400 mm average hanging beam span column, 6 m 2roof area supported and read down to span equal to or greaterthan 3500 mmADOPTSmartSplay 15 Roof-void beam200 x 58Average hanging beam span(mm)2400 4200Roof area supported (m 2 ) 2 4 6 8 10 2 4 6 8 10Member size DxB (mm)300x42 5500 5100 4800 4500 4300 5000 4700 4500 4300 4100OnlyRoof void chamfer on one end onlyMaximum span for sheet roof and ceiling (mm)170x42 3500 3000 2700 2400 2200 3100 2800 2500 2300 2100200x42 4000 3600 3300 3000 2800 3700 3400 3100 2800 2600240x42 4600 4200 4000 3700 3500 4200 4000 3700 3600 3300170x58 3800 3400 3100 2800 2500 3500 3100 2900 2600 2400200x58 4300 4000 3700 3400 3200 4000 3700 3500 3200 3000240x58 5000 4600 4300 4100 3900 4600 4300 4100 3900 3700300x58 5900 5500 5200 5000 4700 5400 5100 4900 4700 4500360x58 6600 6300 6000 5800 5600 6100 5900 5700 5500 5300300x75 6200 5800 5600 5300 5100 5700 5400 5200 5000 4900Average hanging beam span(mm)2400 4200Roof area supported (m 2 ) 2 4 6 8 10 2 4 6 8 10Member size DxB (mm)Maximum span for tile roof and ceiling (mm)170x42 2900 2300 1900 1700 1500 2700 2200 1800 1600 1500200x42 3500 2800 2400 2100 1900 3300 2700 2300 2100 1900240x42 4100 3600 3100 2800 2500 3900 3400 3000 2700 2400300x42 5000 4400 4000 3700 3400 4700 4200 3900 3600 3300170x58 3300 2600 2200 1900 1800 3000 2500 2200 1900 1700200x58 3900 3300 2800 2500 2200 3600 3100 2700 2400 2200240x58 4500 3900 3600 3200 2900 4200 3800 3400 3100 2800300x58 5400 4800 4400 4100 3800 5000 4600 4200 4000 3800360x58 6200 5600 5200 4800 4600 5800 5300 5000 4700 4500300x75 5700 5200 4700 4400 4200 5400 4900 4600 4300 4100i. Minimum end bearing length = 70 mmii. Top edge of strutting beams with D/B >3 shall be laterally restrained as per details on page 6SmartLVL 15 Design Guide (WA Supplement) 87