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Stramit Purlins, Girts & Bridging

P r o d u c t t e c h n i c a l m a n u a lSTRAMIT purlins , Girts & Bridging PGB TABSTRAMIT purlins , Girts &BRIDGINGIMPORTANT NOTEThe 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 guide to selectingand specifying Stramit purlins , Girts and and Specification2 Features2 Applications2 Materials2 Adverse Conditions2 Compatibility2 Specification2 Quick Selection3 Tolerances3 Standard Sizes4 Special Sizes4 Expansion Joints4 Downturn Lips4 Economical Span Configurations4 Design Data5 Sizes5 Section Properties6-8 Suspended L

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 particular

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Transcription of Stramit Purlins, Girts & Bridging

1 P r o d u c t t e c h n i c a l m a n u a lSTRAMIT purlins , Girts & Bridging PGB TABSTRAMIT purlins , Girts &BRIDGINGIMPORTANT NOTEThe 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 guide to selectingand specifying Stramit purlins .

2 Girts and and Specification2 Features2 Applications2 Materials2 Adverse Conditions2 Compatibility2 Specification2 Quick Selection3 Tolerances3 Standard Sizes4 Special Sizes4 Expansion Joints4 Downturn Lips4 Economical Span Configurations4 Design Data5 Sizes5 Section Properties6-8 Suspended Loads8 Local Pressure Zones8 Purlin Spacing9 Span Configurations9 Capacities9 Design Capacity Tables10- 23 Design Rules/Assumptions22-23 Bridging Positions24 Girt Bridging Capacity24- 26 Laps26 Bolts26 Holes26 Fascia Purlins26 Cantilevers26R-Factors27 Procurement27 Prices27 Lengths27 Accessories27 Orders27 Lead Times27 Related Products27 Delivery/Unloading27 Installation28 Good Practice28 Walking28 Bolts28 Laps28 Fly Bracing28 Bridging28 Additional Information28 Design Service28 Further Information28 References29 Other Products29 Patents/Design29 IntroductionThis revised Stramit purlins , Girts and Bridgingproducttechnical manualincorporates limit state design capacitiesbased on the latest software specifically developed forpurlins and Girts at Sydney University.

3 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 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 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 SupportStramit have a Technical Services Manager in each regionto assist with all technical issues.

4 This enables Stramit toprovide advice which reflects local conditions and To UseThe procedure for using the Stramit Purlin, Girts andBridgingproduct technical manualis largely self-explanatory. Please ensure that you are familiar with theassumptions and conditions by reading the manual these are understood the basic sequence is:1. Establish the required inward and outward loads using 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 page2 Selection & SpecificationFeatures High Tensile Steel for high strength and low weight. Z350 Zinc Coating for economic protection.

5 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 purlins and Girtsare primarily used to supportroof or wall sheeting in industrial, rural and commercialbuildings.

6 While commonly attached to fabricated steelframes, the C and Z sections are, on occasion, also used insmall and medium sized buildings for the structural 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 purlins and Girtsare manufactured from hi-tensilesteel, with a minimum Z350 galvanised coating (350g/m2)conforming to AS1397. Other coatings, grades andmaterials may be available, subject to inquiry. The mass and steel grade for each standard Stramit Purlin and Girtsection are shown below:SectionThicknessStrengthMassC or ConditionsStramit purlins and Girtswill give excellent durability inmost applications.

7 In exposed conditions, unwashed areassubject to salt-laden air or other corrosive matter mayneed additional protection. Stramit purlins and Girtsarenot recommended for use within 450mm of moist between galvanised steel and copper ( pipework)must be avoided as premature corrosion will 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 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.

8 All sections shall be produced from galvanisedsteel to AS1397 with a coating mass of at least 350g/m2and 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 Bridgingshall 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 & Bridgingare only intendedfor use in commercial/industrial/residential roof andwall cladding support or structural framingapplications.

9 Do not use for any other SelectionThe 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 :If the purlin load is and equal spans of are sought,the chart suggests that Z200-15 purlins with 1 row of Bridging arethe most 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 (kN/m)PURLIN SPAN (m)Z100-10 (1)Z100-10 (2)Z100-12 (2)Z150-10 (1)Z150-10 (2)Z150-15 (3)Z150-19 (3)Z150-12 (2)Z150-15 (2)Z200-15 (2)Z200-15 (3)Z200-24 (3)Z250-19 (2)Z200-19 (2)Z250-24 (2)Z300-24 (2)Z300-24 (1)Z250-24 (1)Z250-19 (1)Z200-24 (1)Z200-19 (1)Z150-24 (2)Z150-24 (1)Z150-19 (1)Z100-19 (1)Z100-15 (1)Z100-12 (1)Z150-12 (1)Z150-15 (1)Z150-19 (2)Z200-15 (1)Z200-24 (2)Z300-30 (1)Z300-30 (2)Z350 -30 (1)

10 Stramit purlins & Girts QUICK SELECTION CHART CONTINUOUS purlins /OUTWARDS DESIGN CAPACITYNote - Figures in brackets are the required number of rows of SizesStramit offers a full size range from 100mm to 350mm inweb size increments of 50mm. This ensures economicaldesign by using adequate section size in the desired thickness. All sizes are available pre-punched and comecomplete with a full range of accessories including Bridging and SizesFor special or large projects, Stramit is able to producepurlins outside the standard size range. Any web size between 100mm and 400mm Any flange size between 30mm and 130mm Any lip size between 9mm and 35mm, or 0 (unlipped) Thicknesses between and Material strength between 300 MPa and 550 MPa Maximum feed strip width of 640mmSpecial purlin load limit state design capacities are calculated with the aid of computer systems and requestsfor information should be directed to your regionalStramit Technical Services JointsRoof sheeting is generally limited to the lengths shown in the table below to avoid problems associated withthermal expansion.


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