Comparison of progressive collapse resistance capacities of steel ordinary and intermediate moment frames considering different connection details

2021 ◽  
Vol 231 ◽  
pp. 111753
Author(s):  
Sang-Yun Lee ◽  
Sam-Young Noh ◽  
Dongkeun Lee
Keyword(s):  
Progressive Collapse ◽  
Moment Frames ◽  
Collapse Resistance

scholarly journals Evaluation of Progressive Collapse Resistance of Steel Moment Frames Designed with Different Connection Details Using Energy-Based Approximate Analysis

2018 ◽  
Vol 10 (10) ◽  
pp. 3797
Author(s):  
Sang-Yun Lee ◽  
Sam-Young Noh ◽  
Dongkeun Lee
Keyword(s):  
Progressive Collapse ◽  
Initial Structure ◽  
Approximate Analysis ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Reduced Models ◽  
Collapse Resistance ◽  
Composite Slabs ◽  
Rbs Connections ◽  
Chord Rotation

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.

Multi-Hazard Risk Mitigation through Application of Seismic Design Rules

2018 ◽  
Vol 763 ◽  
pp. 1139-1146 ◽  
Author(s):  
Dan Dubină ◽  
Florea Dinu ◽  
Ioan Marginean
Keyword(s):  
Seismic Design ◽  
Risk Mitigation ◽  
Progressive Collapse ◽  
Steel Structures ◽  
Lateral Force ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Design Concepts ◽  
Collapse Resistance ◽  
Extreme Hazards

Multi-story buildings often use steel moment frames as lateral force resisting systems, because such systems would allow architectural flexibility, while providing the strength, stiffness, and ductility required to resist the gravity, wind, and seismic loads. Steel moment frames on which capacity design concepts are applied to resist earthquake induced forces, are generally considered robust structures, with adequate resistance against collapse for other extreme hazards, for example blast or impact. Starting from this point, the present paper summarizes the results of some recent studies carried out in the Department of Steel Structures and Structural Mechanics and CEMSIG Research Center from Politehnica University Timisoara, aiming to evaluate the influence of beam-to-column joints, designed to satisfy seismic design requirements, on the progressive collapse resistance of multi-story steel frame buildings.

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