advanced construction technology
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Advanced Construction Technology. By Professor Chris Gorse & Ian Dickinson – licensed under the Creative Commons Attribution – Non-Commercial – Share Alike License http://creativecommons.org/licenses/by-nc-sa/2.5/. Steel frame: Fire Protection. Chris Gorse and Ian Dickinson - PowerPoint PPT PresentationTRANSCRIPT
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Advanced Construction Technology
By Professor Chris Gorse & Ian Dickinson – licensed under the Creative Commons Attribution – Non-Commercial – Share Alike License
http://creativecommons.org/licenses/by-nc-sa/2.5/
![Page 2: Advanced Construction Technology](https://reader036.vdocument.in/reader036/viewer/2022081513/56816393550346895dd48a81/html5/thumbnails/2.jpg)
Steel frame: Fire Protection
Chris Gorse and Ian Dickinson
These slides should be read in conjunction with Emmitt, S. and Gorse, C. (2010) Barry’s Advanced Construction
of Buildings. Oxford, Blackwell Publishing
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Fire protection
• Steel rapidly loses strength in a fire and needs protection from heat.
• 550oC is normally considered a critical temperature in building fires as carbon steel will lose 50% of its strength at this temperature.
• Low carbon steel actually melts at a considerably higher temperature - around 1464oC, high carbon steels melt at slightly lower temperatures 1353oC.
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Properties of steel in a fire(Source fireengineering.corus.garnerdigital.com)
• “For hot rolled structural steel the yield strength reduces as the temperature increases dropping to about 60% of its ambient temperature strength at around 400°C and approximately 10% at 800°C. However the stress at 2% strain (normally reached when a steel floor beam attains its permitted limit of deflection) initially increases with increasing temperature reaching a peak value at around 250°C.
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High strength bolts (Source fireengineering.corus.garnerdigital.com)
• High strength bolts achieve much of their strength by a quenching and temper process.
• The bolts are quenched at temperatures from around 850°C creating an extremely hard but brittle structure.
• The bolts are then tempered between 475°C to 600°C to restore some ductility, but this does result in a measured loss in strength.
• If these temperatures are exceeded during a fire the bolts will over temper resulting in a sharp drop in strength.
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Main types of fire protection
• Boarded protection e.g. plasterboard, vermiculite boards, calcium silicate boards, mineral fibre boards.
• Spray on fire protection e.g. vermiculite cement, mineral fibre, magnesium oxychloride
• Painted or sprayed coatings: Intumescent coatings, these are generally water or solvent based and are applied in thicknesses of 0.2 to 5mm.
• There are epoxy type resins that can be used in hostile environments and these may be up to 12mm thick.
• Traditional materials such as block, brick, concrete and timber can be used
• Tubular steel filled with water can also offer some protection. The mass of water absorbs the heat and for a time disperses it through the column.
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Incombustible board protection
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Boarded fire protection
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Board protection
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All joints sealed
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Intumescent paint (swelling paint)
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Intumescent paint