Commercial Framing Systems - Ullrich Aluminium

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DESIGNALUMINIUMSection No:Page No:Date:Replaces:21501.05.052003 EDITIONDEFLECTION OF TRANSOM DUE TO DEAD LOAD OF GLASSThe graphs below indicate sizes of 6mm and 10mm glass supported at quarter points producean arbitrary mid span deflection of 3mm in transom. In certain situations such asover doorways little or no deflection can be tolerated. Mid span deflection can be reducedby supporting the glass closer to the ends, rather than at the quarter points. Rememberthat the ‘I’ section obtained from the graphs is about the horizontal axis.GRAPH: 4.Deflection (with 6mm Glass)400050 100 150 200 300 400 5001 value x 10 3 mm 4 of transomHeight of glass (mm)3000200010006mm glassSH09001200 1500 1800 2100 2400 2700 3000Span of transom (mm)GRAPH: 5.Deflection (with 10mm Glass)400050 100 150 200 300 400 5001 value x 10 3 mm 4 of transomHeight of glass (mm)30002000100010mm glassSH09001200 1500 1800 2100 2400 2700 3000Span of transom (mm)
ALUMINIUMSection No:Page No:Date:Replaces:21601.05.052003 EDITIONEXAMPLE27001200TRANSOMS DO NOTADD STRUCTURALSTRENGTH TO MULLIONSDATA:STEP: 1.<strong>Commercial</strong> building, 5 Storey, 15m High, Location Sydney.‘Building located in Sydney’ - ‘Region’ = ‘A’(see maps - Page 5-7)STEP: 2. ‘Building is in commercial area’ - ‘Terrain Category’ = ‘4’(see page 8)STEP: 3.‘Building is <strong>Commercial</strong> and less than 30m high’(from flow chart page 10) - Serviceability limit = SPANor table 3 250STEP: 4. ‘Wind Rating’ can now be obtained (from pages 5-7)Known data: Region = ‘A’, Category = ‘4’, Building height =greater than 3 storey.Window Rating = 700 Pa (Serviceability)STEP: 5.Now need to select a section with a ‘Moment of Inertia’ thatwill take the wind pressure. (from graphs pages 12-14)Known data: Height of Mullion = 2700mm, Panel Width=1200mm.Locate point where Mullion Height and Panel Width crosses.Follow graph (curved lines) to edge of graph read Moment ofInertia = 1050 x 10 3 mm 4STEP: 6. Now need to adjust Ixx for ‘site conditions’. (from table 4 Page11 ).Known data: Wind Load = 700 Pa,Deflection Criteria = SPAN250(From table 4 page 11) – Multiplying factor = 0.7Revised Ixx = 1050 x 10 3 mm 4 x 0.7 = 735 x 10 3 mm 4STEP: 7. Select mullion with Ixx greater than 735. (from table 5 page 17).IE. USE AS7106 WITH AS 7110Which has an Ixx value of 848 x 10 3 mm 4
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Commercial Framing Systems - Ullrich Aluminium

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