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Pryda's Specification Guide for Floor and Rafter Truss Systems

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Pryda's Specification Guide for Floor and Rafter Truss Systems www.pryda.com.au Pryda’s Specifi cation Guide for Floor and Rafter Truss Systems April 2012 3 www.pryda.com.au Pryda Floor Truss System Introduction ...............................................................................6 Strong-Backs Pryda Longreach Trusses .........................................................6 Size Beam Selection ...........................................................27 Pryda Span Trusses .................................................................6 Splice Detail .......................................................................27 Non-Aligned Strong-Backs .................................................28 Frequently Asked Questions and Answers ............................7 Strong-Backs Not Required ...............................................28 Product Benefi ts Stability Net Installed Cost Benefi t .........................................................8 General ..................................................................................28 Design Benefi ts ........................................................................9 Wind Bracing .........................................................................28 Construction Benefi ts .............................................................10 Lateral Bracing of Floor Trusses Chords .................................28 Design Considerations End Bracing ...........................................................................29 General Information ................................................................11 Bracing Walls Supported by Cantilever ...................................29 Permanent Actions (Dead Loads) ...........................................11 Fixing at Supports ..................................................................30 Imposed Actions (Live Loads) ................................................11 Face Fixing of Floor Trusses ...................................................30 Computing Wall and Roof Loads on Floor Trusses .................12 Installation ...............................................................................31 Guidance on Other Loads ......................................................12 Factors Affecting Floor Performance Pryda Rafter Truss System Truss Orientation ....................................................................13 Introduction Flooring Material ....................................................................13 Purlin Trusses .........................................................................32 Strong-Backs .........................................................................13 Rafter Trusses ........................................................................32 Bearing ..................................................................................13 Product Benefi ts .....................................................................32 Supporting Beams .................................................................13 Design Considerations No Ceiling Underneath Trusses ..............................................13 Design Loads Serviceability ...........................................................................14 Permanent Actions (Dead Loads) .......................................33 Imposed Actions (Live Loads) .............................................33 Fire and Sound Resistance ....................................................14 Wind Actions (Wind Loads) ................................................33 Durability Ducts for Mechanical Services ...............................................33 Sub-Floor Ventilation ..............................................................14 Factors Affecting Performance Corrosion Protection ..............................................................14 Defl ection Limits .....................................................................34 Protection of Exposed Cantilever Areas ..................................14 Special Loading Conditions ....................................................34 Detail Stability End Types ..............................................................................15 Top Chord Bracing .................................................................34 Internal Walls Bottom Chord Bracing ...........................................................34 Internal Non Load-Bearing Walls – Over Floor Truss ...........19 Cantilever Bracing ..................................................................34 Internal Non Load-Bearing Walls – Under Floor Truss .........20 Fixing to Supports ..................................................................34 Internal Non Load-Bearing Bracing Walls – Under ..............20 Load Bearing Walls – Under Floor Truss .............................20 Detail External Walls End Confi gurations ................................................................35 Fully Supported End Truss ..................................................21 End Truss Under Gable Roof ..............................................21 Appendices: End Truss Carrying Roof Loads Over ..................................21 A - Producer Statement .........................................................36 Offset Load-Bearing Walls ..................................................21 B - Typical Layout ...................................................................38 Support of Concentrated Loads .........................................21 C - Detailers Guide / Check List ...........................................39 Floor Openings ...................................................................22 D - Design Request Form ......................................................40 Beam Pocket Detail ............................................................22 E - Floor Truss Span Tables Block Detail ........................................................................22 Normal Domestic Loads.........................................................41 Stairway Parallel to Trusses ................................................23 Commercial Offi ce Loads .......................................................42 Stairway Perpendicular to Trusses ......................................23 Important Notes about Span Tables .......................................42 Floor Set Down ......................................................................24 Ducts for Mechanical Services ...............................................24 F - Rafter or Purlin Truss Span Tables ..................................43 Cantilevers Normal Domestic Loads.........................................................43 Internal Cantilever ...............................................................25 Commercial Building Loads....................................................43 External Cantilever (Balconies) ............................................25 G - Impact of Higher Permanent Loads ...............................44 Cantilevered Support Off-Set Walls .....................................26 Outrigger Support of Off-Set Walls .....................................26 3 www.pryda.com.au PRYDA FLOOR TRUSS SYSTEM DUCTS/SERVICES (Page 24) CANTILEVERS INTERNAL SUPPORTS (Page 25) (Page 19) END DETAIL (Page 15) CANTILEVERS (Page 25) PRYDA SPAN TRUSS (Page 6) LONGREACH TRUSS (Page 6) 4 www.pryda.com.au INTERNAL BRACING WALLS (Page 20, 29) END DETAIL STRONG-BACKS (Page 15) (Page 27) STABILITY BRACING (Page 28) END DETAIL (Page 15) OPENING DETAILS (Page 22) 5 www.pryda.com.au INTRODUCTION Pryda Span Trusses Pryda Floor Truss Systems are a complete structural system for timber fl oors made up of fl ooring material, fl oor trusses, Strong- PRYDA SPAN TRUSS Backs, connections and bracing. They have been proven over many years and provide occupiers with fl oors that have an excellent and predictably reliable performance. The timber for these trusses is on fl at, which provides a stable platform during installation and minimizes the overall depth Metal Webs required. All trusses use commonly available timber and most fl oor trusses in Australia are made from 70mm or 90mm dry timber. There are two different types of web systems for these trusses. Pryda Span trusses have metal diagonal webs for light weight and Both have timber chords but Pryda Longreach uses all-timber economy. They are ideal for shallower trusses where there is more webs, while Pryda Span uses metal webs for the diagonals and clearance room to accommodate the plumbing than with timber timber webs for the verticals. webs and for trusses where the chord design has some reserve Both systems of Pryda fl oor trusses are generally made to order by capacity, as is often the case. In some Instances, a few diagonal licensed fabricators. While there are standard end details that allow metal webs may have to be replaced by timber webs in these trusses to be trimmed on site, this practice is not common. This trusses, as load or geometry considerations dictate. is not only because all trusses are designed for an exact span for Webs may be on both faces of the truss or just on alternate faces, economic reasons, but the interaction between the true span of the and in the latter case this allows for the webs to overlap. trusses and the fl ooring should be considered for proper dynamic performance assessment. Pryda Span trusses are referenced as PS25, PS30, and PS40, where “PS” means Pryda Span, and “30” is the nominal overall depth (cm). The overall depths are nominally 250, 300 and 400mm Pryda Longreach Trusses deep. The actual depth dimensions are in nominal size steps according to the metal web used,
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