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  • Code News: ISO Fire Standards Update

    The ISO TC92/Subcommittee 2 (on Fire Containment) working groups are developing new fire tests continuously. One which has been worked on for several years and is finally being published, is ISO 834 parts 10 & 11 on evaluating the fire resistance contribution to structural steel items of protective coatings such as intumescent sprays, as reported in our previous newsletter. 

     

    The Standards Box: ISO Fire Standards Update

    The following standards update is reprinted with permission from FIRESIDE, the quarterly newsletter from Priests and Associates Consulting LLC. For more information about their services go to: http://www.priestassociates.com

    The ISO TC92/Subcommittee 2 (on Fire Containment) working groups are developing new fire tests continuously. One which has been worked on for several years and is finally being published, is ISO 834 parts 10 & 11 on evaluating the fire resistance contribution to structural steel items of protective coatings such as intumescent sprays, as reported in our previous newsletter.

    However, it has become apparent that the increasing use of structural steel elements with web openings, either round, oval or square, are introducing variables into the equation that do not exist with solId flange elements. For one thing, the hottest portion of the elements tends to exist along the centerline of the flange, between the openings.

    beam examined in fire resistance structural steel tests

    Typical Beam with Web Openings

    Designers and engineers are fond of these types of structural elements because they reduce weight and supply numerous channels for cables, pipes and other items to pass through. However, the method used to load these items during a fire resistance test (and indeed, in a field application) must be carefully considered. Beams with web openings can fail in one of many ways, several of which are unique to this type of element:

    • Vertical Shear
    • Bending
    • Web Post Buckling – occurs when the web separating two openings is unable to transfer the required horizontal shear force and the shear stress is greater than the shear strength of the web.
    • Web Post Horizontal Shear – often occurs on slender web posts between closely spaced openings.
    • Vierendeel Bending – the mechanism by which shear is transferred across the web opening and causes bending in the top and bottom, left and right, parts of the beam surrounding the opening.

    Loading should always be as uniform as possible, to avoid web post failure, and the ratios of opening diameter and spacing to web height must be considered carefully.

    The ISO standard for evaluating structural elements with web openings is at the beginning stages now, and work will begin in earnest shortly.

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  • Projects: Saudi Arabia Railway

    Contego fire resistant paint has been chosen by Saudi Arabia Railway to protect its railway stations.

    The SAR (Saudi Arabia Railway) project will include both passenger and cargo railway systems. The passenger service utilizing advanced modern trains will start in 2014 and will have six stations in Riyadh, Majma’a, Qassim, Hail, Al-Jawf, and Al-Qurayyat.  All of the stations have been protected by Contego intumescent paint.

    Take a sneak peak at other projects.

     

    #7_STEEL, Contego fire resistant paint applied to steel frame of SAR

     

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