Evaluation of progressive collapse resistance of steel moment frames designed with different connection details using energy-based approximate analysis

Sang Yun Lee, Sam Young Noh*, Dong Keun Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This study evaluates the progressive collapse resistance performance of steel moment frames, individually designed with different connection details. Welded unreinforced flange-bolted web (WUF-B) and reduced beam section (RBS) connections are selected and applied to ordinary moment frames designed as per the Korean Building Code (KBC) 2016. The 3-D steel frame systems are modeled using reduced models of 1-D and 2-D elements for beams, columns, connections, and composite slabs. Comparisons between the analyzed results of the reduced models and the experimental results are presented to verify the applicability of the models. Nonlinear static analyses of two prototype buildings with different connection details are conducted using the reduced models, and an energy-based approximate analysis is used to account for the dynamic effects associated with sudden column loss. The assessment on the structures was based on structural robustness and sensitivity methods using the alternative path method suggested in General Services Administration (GSA) 2003, in which column removal scenarios were performed and the bearing capacity of the initial structure with an undamaged column was calculated under gravity loads. According to the analytical results, the two prototype buildings satisfied the chord rotation criterion of GSA 2003. These results were expected since the composite slabs designed to withstand more than 3.3 times the required capacity had a significant effect on the stiffness of the entire structure. The RBS connections were found to be 14% less sensitive to progressive collapse compared to the WUF-B ones.

Original languageEnglish
Article number3797
JournalSustainability (Switzerland)
Volume10
Issue number10
DOIs
StatePublished - 20 Oct 2018

Keywords

  • Abnormal loads
  • Energy-based approximate analysis
  • Progressive collapse
  • Seismic connection detail
  • Structural robustness
  • Structural sensitivity
  • Sudden column removal

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