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Progressive collapse analysis of steel frames: Simplified procedure and explicit expression for dynamic increase factor

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Abstract

Progressive collapse refers to a phenomenon in which local damage in a primary structural element leads to total or partial structural system failure. When investigating the progressive collapse of structures, nonlinear dynamic procedures lead to more accurate results than static procedures. However, nonlinear dynamic procedures are very complicated and the evaluation or validation of the results can become very time consuming. Therefore, it is better to use simpler methods. For static analyses, the gravity force applied to the removed column bay should be multiplied by a constant factor of two. However, using a constant dynamic increase factor (DIF) is only appropriate for elastic systems. According to the optimal design of structures, the assumption of elastic behavior after column removal is conservative. Thus, it is necessary to establish an expression for DIF that considers inelastic responses. In this paper, a simplified analysis procedure for the progressive collapse analysis of steel structures is presented using the load displacement and capacity curve of a fixed end steel beam. The results of the proposed method are in good agreement with nonlinear dynamic analysis results. Also, the capacity curve, obtained by dividing the accumulated area under the nonlinear static load displacement curve by the corresponding displacement of the column removed point, is used to predict the progressive collapse resistance of the column removed structure. Finally, an explicit expression for the DIF is established for elastic-perfectly plastic and elastic plastic with catenary action behavior.

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Authors and Affiliations

  1. Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

    Arash Naji & Fereidoon Irani

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  1. Arash Naji
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  2. Fereidoon Irani
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Correspondence to Arash Naji.

Additional information

Note.-Discussion open until May 1, 2013. This manuscript for this paper was submitted for review and possible publication on October 19, 2011; approved on November 29, 2012.

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Naji, A., Irani, F. Progressive collapse analysis of steel frames: Simplified procedure and explicit expression for dynamic increase factor. Int J Steel Struct 12, 537–549 (2012). https://doi.org/10.1007/s13296-012-4008-0

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