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STRAMIT PURLINS, GIRTS & BRIDGING

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STRAMIT PURLINS, GIRTS & BRIDGING
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  p r o d u c t t e c h n i c a l m a n u a l STRAMIT PURLINS, GIRTS &BRIDGING  ® PGB – TAB  STRAMIT ® PURLINS, GIRTS &BRIDGING IMPORTANT NOTE The information contained within this brochure is as far as possible accurate at the date of publication, however, before application in a particularsituation, Stramit Building Products recommends that you obtain qualified expert advice confirming the suitability of product(s) and information inquestion for the application proposed. While Stramit accepts its legal obligations, be aware however that to the extent permitted by law, Stramitdisclaims all liability (including liability for negligence) for all loss and damage resulting from the use of the information provided in this brochure. Comprehensive guide to selecting and specifying Stramit ® Purlins,Girts and Bridging  .  1 Contents Selection and Specification 2 Features2Applications2Materials2Adverse Conditions2Compatibility2Specification2Quick Selection3Tolerances3Standard Sizes4Special Sizes4Expansion Joints4Downturn Lips4Economical Span Configurations4 Design Data 5 Sizes5Section Properties6-8Suspended Loads8Local Pressure Zones8 Purlin Spacing9Span Configurations9Capacities9Design Capacity Tables10-23Design Rules/Assumptions22-23Bridging Positions24Girt Bridging Capacity24-26Laps26Bolts26Holes26Fascia Purlins26Cantilevers26R-Factors27 Procurement 27  Prices27Lengths27Accessories27Orders27Lead Times27Related Products27Delivery/Unloading27 Installation 28 Good Practice28Walking28Bolts28Laps28Fly Bracing28Bridging28 Additional Information 28 Design Service28Further Information28References29Other Products29Patents/Design29 Introduction This revised Stramit ® Purlins, Girts and Bridging  producttechnical manual  incorporates limit state design capacitiesbased on the latest software specifically developed forpurlins and girts at Sydney University. This software isbased on the limit state AS/NZS4600:1996 ‘Cold-formedsteel’. Use of Sydney University’s vacuum test rig and thelatest computer software has enabled Stramit MetalBuilding Products to remain at the forefront of cold-formed purlin technology.Since the last manual was produced, significant differencesin both purlin specifications and the data provided haveoccurred including:•Upgraded standard zinc coatings•Improved design capacity computations•Comprehensive bridging design capacity dataA complimentary manual Stramit ® Purlins, Girts &Bridging   –  Detailing & Installation Guide , is also available. Testing Stramit Research and Development has carried outnumerous in-house tests at its Rydalmere complex on bothpurlins and/or girt bridging. In addition a comprehensivepurlin test programme at Sydney University has beenused in the substantiation of these design capacity tables. Technical Support Stramit have a Technical Services Manager in each regionto assist with all technical issues. This enables Stramit toprovide advice which reflects local conditions and practices. How To Use The procedure for using the Stramit ® Purlin, Girts and Bridging  product technical manual  is largely self-explanatory. Please ensure that you are familiar with theassumptions and conditions by reading the manual fully.Once these are understood the basic sequence is:1.Establish the required inward and outward loads using AS1170.22.Turn to the design capacity tables for the preferredspan configuration3.Select a suitable purlin from the outward design capacity page (always the left-hand opening)4.Check for inward capacity and deflection on the adjacent page  2 Selection & Specification Features •High Tensile Steel – for high strength and low weight.•Z350 Zinc Coating – for economic protection.•Quality Product – with Stramit’s proven record formanufacturing and supply.•Integrated Bridging – boltless design specifically forStramit sections.•Full Range of Accessories – from brackets to bolts to ensure easy use and installation.•Full Size Range – for ease of design in both C and Z sections.•Recognized Design Input – design dependability fromthe Sydney University computer programme.•Limit State Design in accordance with AS4600 – suitable for all government projects.•Downturn Lip available including Lappable Zs – for projects requiring this feature.•Special Size Capability – non standard range of specialshapes and channels available to suit individualrequirements. Applications Stramit ® Purlins and Girts are primarily used to supportroof or wall sheeting in industrial, rural and commercialbuildings. While commonly attached to fabricated steelframes, the C and Z sections are, on occasion, also used insmall and medium sized buildings for the structural frame.Continuously lapped Z purlins generally provide thegreatest economy for medium and large buildings. C purlinsare often favoured for their stability in single spans, andare also adaptable to doubly symmetric ‘ I ’ and ‘box’ configurations. Materials Stramit ® Purlins and Girts are manufactured from hi-tensilesteel, with a minimum Z350 galvanisedcoating (350g/m 2 )conforming to AS1397. Other coatings, grades andmaterials may be available, subject to inquiry. The mass and steel grade for each standard Stramit ® Purlin and Girt section are shown below: SectionThicknessStrengthMassC or ZmmMPakg/m100-101.0G5501.77100-121.2G5002.11100-151.5G4502.61100-191.9G4503.29150-101.0G5502.43150-121.2G5002.90150-151.5G4503.59150-191.9G4504.51150-242.4G4505.67200-151.5G4504.50200-191.9G4505.74200-242.4G4507.21250-191.9G4506.50250-242.4G4508.17300-242.4G45010.18300-303.0G45012.69350-303.0G45015.19 Adverse Conditions Stramit ® Purlins and Girts will give excellent durability inmost applications. In exposed conditions, unwashed areassubject to salt-laden air or other corrosive matter mayneed additional protection. Stramit ® Purlins and Girts arenot recommended for use within 450mm of moist soil. Compatibility Contact between galvanised steel and copper (e.g. pipework)must be avoided as premature corrosion will occur. Specification Maintaining the correct specification of purlins, girts andbridging is very important. Some manufacturers produceso-called ‘equivalent’ products that are smaller in size, (andhence capacity) have a lesser coating and even a lowerstrength grade of steel. Even a small change in specificationcan lead to substantial reduction in performance.This specification can be found on the Stramit web siteand can be easily downloaded on to your documentation.“All purlins and girts shall be Stramit sections or approvedequivalent, supported by submission of section properties,purlin capacity calculations, bridging capacity calculationsand a performance warranty, produced and detailed forthis project. All sections shall be produced from galvanisedsteel to AS1397 with a coating mass of at least 350g/m 2 and designed in accordance with AS4600. All sectionsshould be installed in accordance with the manufacturer’sinstructions with particular regard to bolt locations andlap sizes”.“Where required for structural or installation purposes, Stramit ® Bridging  shall be installed using pre-made components to manufacturer’s instructions. All otheraccessories shall be supplied by Stramit”.“All structural work shall be completed in a workmanlikemanner prior to installation of the cladding material”. Stramit ® Purlins, Girts & Bridging  are only intendedfor use in commercial/industrial/residential roof andwall cladding support or structural framingapplications. Do not use for any other purpose.  3 Quick Selection The chart above gives the lowest mass (generally lowestcost) purlin/girt solution for equal continuous lapped Zs – the most popular span configuration. Where applicablean additional row of bridging has been added to allow alighter section to be used. This chart assumes that outwardloads will determine design. For other cases, and for confirmation of selection made, use the full design capacitytables within this manual. Example: If the purlin load is 2.5kN/m and equal spans of 6.0m are sought,the chart suggests that Z200-15 purlins with 1 row of bridging arethe most economical. Tolerances All sections will be produced within the following tolerances:Section length   0mm / –10mmSection web (dim. D)   1mmSection flange (dim. B, E, F)   1mmInternal flange angle   1 ° Internal lip angles   5 ° / –2 ° Hole centres   1mmTighter tolerances for special projects may be possibleand are subject to negotiation 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.06.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6    L   O   A   D   (   k   N   /  m   ) PURLIN SPAN (m) Z     1    0    0    -  1    0      (     1      )     Z  1 0 0 - 1 0  (  2  ) Z  1 0 0 - 1 2  (  2  )  Z  1  5  0  - 1  0   (  1   )  Z  1 5 0 - 1 0  (  2  )  Z 15 0 - 15  ( 3  ) Z 15 0 - 19  ( 3  )  Z  1 5 0 - 1 2  (  2  ) Z  1 5 0 - 1 5  (  2  )  Z   2  0  0  - 1  5    (   2   )   Z  2  0  0  - 1  5   (  3   )  Z   2  0  0  - 2  4   (   3   )   Z   2  5   0   - 1  9    (   2   )   Z   2  0  0  - 1  9   (   2   )   Z    2   5   0   -  2   4     (    2     )    Z     3    0    0    -  2    4      (     2      )    Z     3    0    0    -  2    4      (     1      )     Z      2     5     0     -  2     4       (      1       )     Z      2     5     0     -  1     9       (      1       )      Z               2              0              0              -      2              4                   (               1                   )               Z          2          0          0          -    1         9             (          1             )          Z         1        5        0        -    2        4            (         2           )         Z       1       5       0       -   2       4          (       1          )       Z          1         5          0          -    1         9             (          1             )         Z          1         0          0          -    1         9             (          1             )          Z       1      0      0      -   1      5         (       1         )       Z      1     0     0     -  1     2       (      1       )      Z     1    5    0    -  1    2      (     1      )     Z      1     5     0     -  1     5       (      1       )      Z     1    5     0    -  1    9      (     2      )    Z     2    0    0    -  1    5       (     1      )     Z     2     0     0     -  2     4       (     2       )      Z     3     0    0    -  3     0      (     1      )    Z     3     0    0    -  3     0      (     2      )     Z     3    5    0     -  3    0      (     1      )     STRAMIT  ® PURLINS & GIRTS QUICK SELECTION CHART – CONTINUOUS PURLINS/OUTWARDS DESIGN CAPACITY Note - Figures in brackets are the required number of rows of bridging.
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