Techno Press

Steel and Composite Structures   Volume 21, Number 3, June30 2016, pages 553-571
Progressive collapse analysis of steel frame structure based on the energy principle
Chang Hong Chen, Yan Fei Zhu, Yao Yao and Ying Huang

Abstract     [Full Text]
    The progressive collapse potential of steel moment framed structures due to abrupt removal of a column is investigated based on the energy principle. Based on the changes of component's internal energy, this paper analyzes structural member's sensitivity to abrupt removal of a column to determine a sub-structure resisting progressive collapse. An energy-based structural damage index is defined to judge whether progressive collapse occurs in a structure. Then, a simplified beam damage model is proposed to analyze the energies absorbed and dissipated by structural beams at large deflections, and a simplified modified plastic hinges model is developed to consider catenary action in beams. In addition, the correlation between bending moment and axial force in a beam during the whole deformation development process is analyzed and modified, which shows good agreement with the experimental results.
Key Words
    progressive collapse; energy; sensitivity; modified plastic hinges model; steel frame
(1) Chang Hong Chen, Yan Fei Zhu, Yao Yao:
School of Mechanics, Civil Engineering, Northwestern Polytechnical University, Xi'an, 710129 China;
(2) Ying Huang:
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055 China.

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