An investigation of overturning moments of portal frames at elevated temperatures

Rahman, Mahbubur and Lim, James and Hamilton, Robert and Comlekci, Tugrul and Pritchard, David and Xu, Yixiang; (2009) An investigation of overturning moments of portal frames at elevated temperatures. In: Proceedings of International Conference Applications of Structural Fire Engineering. EuroFire Engineering. ISBN 978-80-01-04266-3

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    Abstract

    In the UK, single-storey steel buildings account for over half of the constructional steelwork due to its ease of fabrication and cost-efficiency. The most common of these are portal frames. One of the major disadvantages of constructional steel is its sensitivity to fire, as steel looses strength and stiffness rapidly. For this reason, fire protection is often required, which can add to the expense of structure. In fire, the rafter often loses stability through a snap-through-buckling mechanism (see Fig. 1.). This, however, can be capable of restabilising at high deflections, when the roof has inverted. In static analysis methods, only the initial loss of stability can be determined. In fire conditions it is imperative that boundary walls stay close to vertical, so that fire is not allowed to spread to adjacent property. The current UK fire design guide (Ref.1) provided by Steel Construction Institute (SCI) provides a method for the determination of the overturning moment at the column base that must be resisted in order to prevent stability of walls. However, the method makes a number of arbitrary assumptions and does not attempt to model the true behaviour of the frame during fire.

    Creators(s): Rahman, Mahbubur, Lim, James, Hamilton, Robert ORCID logoORCID: https://orcid.org/0000-0002-3504-9774, Comlekci, Tugrul ORCID logoORCID: https://orcid.org/0000-0002-7892-7960, Pritchard, David ORCID logoORCID: https://orcid.org/0000-0002-9235-7052 and Xu, Yixiang ORCID logoORCID: https://orcid.org/0000-0003-4406-1262;
    Item type:Book Section
    ID code:44327
    Notes:Also presented at: Application of Structural Fire Engineering, EuroFireEngineering Conference, Prague, 19-20 Feb 2009.
    Keywords:fire safety, fire engineering, structural fire engineering, Mechanical engineering and machinery, Engineering (General). Civil engineering (General)
    Subjects:Technology > Mechanical engineering and machinery
    Technology > Engineering (General). Civil engineering (General)
    Department:Faculty of Engineering > Civil and Environmental Engineering
    Faculty of Engineering > Mechanical and Aerospace Engineering
    Faculty of Science > Mathematics and Statistics
    Depositing user: Pure Administrator
    Date deposited:09 Jul 2013 09:33
    Last modified:07 Jan 2021 02:40
    URI:https://strathprints.strath.ac.uk/id/eprint/44327
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