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The Passive Fire Protection Handbook The UK's comprehensive guide to passive fire protection Chapter 3 Structural Steel AUGUST 2017 qPqv building “V.” A performance
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The Passive Fire Protection Handbook Chapter 4: Ceilings, Floors and Roofs Chapter 5: Partitions and External Walls Chapter 6: Fire Rated Ductwork and Service Enclosures Chapter 7: Penetration Seals Chapter 8: Smoke Barriers and Doors
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CHAPTER 3: STRUCTURAL STEEL Structural Steel TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017 Chapter 3: Structural Steel The amount of fire protection required to achieve this depends on the following: • Duration of fire resistance specified • Type of protection used • Perimeter of the steel section exposed to fire • Shape and size of the steel section STRUCTURAL STEEL The Building Regulations require certain elements of structure to have fire resistance for a specified minimum period of time. The amount of fire protection required to achieve this depends on the following: — Duration of fire resistance specified — Type of protection used...
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Chapter 3: Structural Steel Introduction Partially Exposed Members Where columns or beams are partly built into or are in close contact with walls or floors, then account can be taken of the protection afforded to the steelwork by the wall or floor. In the case of masonry work, this will give protection to the adjacent surface of the steelwork for the purpose of determining the heated perimeter. External Lightweight Walls In the case of portal legs supporting a lightweight external wall, the insulation performance required by the wall will contribute to the protection of any column flange...
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A/V SECTION FACTOR The degree of fire protection depends on the A/V section factor for the steel section. The A/V factor is a function of the area of the steel exposed to the fire and the volume of the steel section. The higher the A/V, the faster the steel section heats up, and so the greater the thickness of fire protection material required. The section factor and limiting temperature are then used to determine the thickness of protection required. LIMITING TEMPERATURES Historically, the thickness of fire protection was specified such that the maximum temperature of 550°C for columns and...
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BEAMS WITH WEB OPENINGS (CELLULAR BEAMS) The following text relates to guidelines laid down in the ASFP Yellow Book “Fire Protection for Structural Steel in Buildings" 5th Edition 2014. This Section presents guidance with respect to the evaluation of the fire resistance performance of structural steel beams with openings in the web and protected against fire by passive fire protection systems (typically spray coatings, slabs, renderings and boards). Long span beams with web openings are commonly known as “cellular beams" and have numerous openings in the web to accommodate service items...
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The Passive Fire Protection Handbook | 2017 Chapter 3: Structural Steel Calculation of A/V Values Section factor for standard steel sections are shown. Please consult a qualified structural engineer for detailed advice if steel sizes fall outside those shown. To provide a consistent structural approach for these beams, the ASFP sponsored the SCI to produce a model capable of considering a wide range of beam designs and opening shapes and spacing. The SCI have published this method under their reference RT 1356. The latest version can be found on www.steelbiz.org. The method of RT 1356...
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The Passive Fire Protection Handbook | 2017
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Note: Data on older and other steel sizes can be found on ASFP website/technical section (www.asfp.org.uk) TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017
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TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017
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Chapter 3: Structural Steel A/V Tables for Steelwork Encasements Data on older and other steel sizes can be found on ASFP website/technical section (www.asfp.org.uk) TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017
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TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017 ROLLED TEES Note: Whilst the ASFP publication has previously included listings for four sizes of 'rolled tees'we are informed by Corus Construction and Industrial Division that 'rolled tees' are no longer available from their current manufacturing facilities.
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Table continued overleaf
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The Passive Fire Protection Handbook | 2017 Note: Data on older and other steel sizes can be found on ASFP website/technical section (www.asfp.org.uk)
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Table continued overleaf TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017
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Chapter 3: Structural Steel A/V Tables for Steelwork Encasements Table 3r Rectangular Hollow Sections (RHS) Section factor A/V (Hp/A) 3 sides Dimensions to EN 10210 S355J2H Designation Size DxB TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017 Chapter 3: Structural Steel A/V Tables for Steelwork Encasements Table 3s Rectangular Hollow Sections (RHS)
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Table 3t Rectangular Hollow Sections (RHS) Dimensions to EN 10210 S355J2H Designation Size Wall TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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The Passive Fire Protection Handbook | 2017 Chapter 3: Structural Steel A/V Tables for Steelwork Encasements Table 3u Rectangular Hollow Sections (RHS)
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Chapter 3: Structural Steel A/V Tables for Steelwork Encasements Table 3v Rectangular Hollow Sections (RHS) Section factor A/V (Hp/A) 3 sides Dimensions to EN 10210 S355J2H Designation Size DxB NOTE: Data on older and other steel sizes can be found on either the ASFP website/technical section (www.asfp.org.uk) or Corus website (www.corusgroup.com) TECHNICAL SERVICES T: 0800 1456033 E: technical.promat@etexbp.co.uk
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