Predicting Fire Behavior of Composite CFT Columns Using Fundamental Section Behavior

    Volume 7, Issue 1 (January 2010)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 3 December 2009

    Page Count: 23


    Hong, Sangdo
    School of Civil Engineering, Purdue Univ., West Lafayette, IN

    Varma, Amit H.
    School of Civil Engineering, Purdue Univ., West Lafayette, IN

    (Received 29 December 2008; accepted 2 October 2009)

    Abstract

    This paper presents the development and verification of a fiber-based analytical approach for predicting the behavior of concrete filled steel tube (CFT) columns subjected to constant axial load and standard fire loading. The approach consists of three parts: (1) Two-dimensional heat transfer analysis, (2) section moment-curvature analysis, and (3) column inelastic buckling analysis using modified Newmark’s method. The analytical approach was verified by using it to predict (1) the thermal and structural behavior of CFT column specimens subjected to standard fire tests by different researchers and (2) the fundamental moment-curvature behavior of CFT beam-column specimens subjected to special (non-standard) fire tests conducted by the authors. The analytical approach predicts the fundamental moment-curvature behavior of CFT beam-column specimens and the standard fire behavior of CFT column specimens with reasonable accuracy. The analytical results also compare favorably with the overall behavior and stress states predicted by three-dimensional finite element analyses conducted earlier by the authors. The fiber-based analytical approach is recommended for modeling and predicting the standard, non-standard, or realistic fire behavior of CFT columns and beam-columns under various loading, heating, and boundary conditions.


    Paper ID: JAI102311

    DOI: 10.1520/JAI102311

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    Author
    Title Predicting Fire Behavior of Composite CFT Columns Using Fundamental Section Behavior
    Symposium Symposium on Advances in the State of the Art of Fire Testing, 2008-12-11
    Committee E05