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 and Dongkeun Lee
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Sang-Yun Lee: Department of Architectural Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangrok-Gu, Ansan, Gyeonggi-Do 15588, Korea
Sam-Young Noh: Department of Architectural Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangrok-Gu, Ansan, Gyeonggi-Do 15588, Korea
Dongkeun Lee: Department of Civil Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan

Sustainability, 2018, vol. 10, issue 10, 1-28

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.

Keywords: progressive collapse; abnormal loads; sudden column removal; seismic connection detail; energy-based approximate analysis; structural robustness; structural sensitivity (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
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