SmartJoist Design Guide 2011_RGB.pdf - Tilling Timber

FASTENER SPACINGMinimum single row nail spacing into SmartJoist flangesOffset secondrow of nailingMinimum nailspacingfrom tableSmartJoist flange widthnail size 40 mm 44 mm 51 mm flange 58-70 mm2.8 x 65 7065 50 503.15 x 65 100 90 75 753.15 x 75 100 90 75 753.75 x 75 130 115 100 1004.5 x 100 NA 1 NA 1 NA 1 NA 190 mm flange507575100100NOTES:1. Nailing of bottom plate at 100 mm centres through floor sheathing and into top flange is permitted2. Minimum nail spacing is shown above, maximum nail spacing is set by the flooring manufacturer, inabsence of manufacturers data, 300 mm centres3. Tighter effective nail spacing may be obtained by offsetting nail rows a minimum of 12 mm and maintaininga 10 mm minimum edge distance.LIMITED END NOTCHING AT SUPPORTSThe cutting of notches in the ends of joists may reduce the allowable end reactions of the SmartJoistsThe amended end reaction capacities of SmartJoists with a 12 mm notch are as follows:• Without web stiffeners - 80% of allowable end reaction• With added web stiffeners (as per detail F13) - Full end reaction capacity. Web stiffener installedin contact with bottomflange as per detail F133-4 mm gap betweentop of web stiffenerand top flangeF16UB, UC orChannelSectionDO NOT OVER CUT FLANGES. SUBSTANTIALREDUCTIONS IN CAPACITY MAY OCCUR IFFLANGES ARE OVER CUT.Rebate of12 mm MaxMin bearinglength 35 mmAdequate lateral restraintor alternatively, a 10 x 30mm long type 17 screw tolower flangeTo maintain the end reaction capacities above, end flange notching is strictly limited to:1. Notch depths NOT greater than 12 mm2. Notches cleanly cut - NO over cutting3. Notch length not to exceed more than 5 mm past the support.EXAMPLE FIXING OF SmartJoists TO STEEL BEAMSTOP MOUNT HANGERone bracket nailin every holeof the joist hanger.Coach boltsFixing platebolted to steelsheet flooringF17UB, UCor ChannelsectionSmartJoistSmartJoistJoist hanger tomatch joist size.SmartJoist Design Guide 17Top mountjoist hangerUB, UC, PFCor Channelsection