Konw the 10 best ways to optimise structural design of single/multi storey wide span PEB ( Pre Engineered Buildings). See the following images to have an idea about application of PEB structures.
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PEB Wide Span Building |
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PEB Aircraft Hangar |
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PEB Large Span Warehouse |
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PEB Multistorey Apartment |
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PEB Multistorey Commercial |
These tips are to be discussed with Architect/Client while seeking approval of GAD and design process:
1. Keep End Bay Spans 0.70times of Interrior Bay Spans: With this approach, you may reduce size of both purlins and girts designed as continuous flexure member with overlaps at interrior supports. Same duplicatable size and thickness of cold form sections give good economy.
2. Use web-tapered I sections for SWC (Side Wall Columns) and CHS/SHS/RHS ie closed tube sections for IC (Interrior Columns). Interrion Columns are bracing-free so require small l/r to use full capacity.
3. Use SSR (Standing Seam Roof) Sheeting on roof: The fixings with the Purlins are screwless hence completely leak-proof. Great for supporting screwless mounting of Solar Racks that support Solar Panael. The Solar Panel creates a gap with SSR which gives insulation and restrict noise due to rain on roof. For energy efficient building, solar panels are the in thing nowadays. Do not suggest Troughed Deck Sheet where Solar panels to be mounted.
4. Enhance SWC, Rafter and Purlin Capacity with appropriate Flange Bracings and for stability od PEB portals as a whole. The flange bracings must be connected before roofing and side cladding work.
5. Always start erection on either side of one completed braced bay (column,rafter, purlins,girts), Complete alignment of columns with anchor Bolts in position and grouting complete. There are so many instances when a PEB building collapsed like a pack of cards where a braced bay is always missing. Never proceed without erecting the Braced Bay First.
6. Use High Tensile Steel Grades for Primary (Hot Rolled) and Secondary Members (Cold Form). Minimum IS:2062 E 350 and Maximum IS:2062 E 460. For multistorey/high rise columns, E 460 offers great economy in steel. Concrete filled tubes (CFT) are the most suited sections for such columns.
7. For floor beams, cellular composite beams are a great option for large spans and running services through web holes thereby reducing floor zone height compared to a solid web beam. This augments for more column - free areas too.
8. The Design Life, Strength and Serviceability requirements must be complied for gravity and lateral loads as appropriate and outlined in respective IS codes of practices.
9. Be careful about connections and fixing fasteners. The roof sheeting detailer must be aware of FM Global provisions for connections of sheetings with purlins and girts. Use anti-cyclonic fixtures.
10. Just fire proofing steel structure has no meaning until and unless all MEP and HVAC services are also fireproofed because they are more costlier that the steel cost. High performance coating add years to the life of steelwork. Ask what client needs!
The above were some tips that I wanted to share with engineers and detailers in PEB field. I would appreciate receiving feedback for further improvements.
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