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Steel and Composite Structures
  Volume 40, Number 4, August25 2021 , pages 481-493
DOI: https://doi.org/10.12989/scs.2021.40.4.481
 


Component-based model for posttensioned steel connections against progressive collapse
Yan Fei Zhu, Chang Hong Chen, Ying Huang, Zhaohui Huang, Yao Yao and Leon M. Keer

 
Abstract
    A component-based method for the estimation of the posttensioned (PT) steel frame against progressive collapse is proposed and presented in the current paper. A mechanical model of PT steel connections is developed and benchmarked with experimental data of a PT beam-column substructure from literature. The developd mechanical models of four PT connections are able to capture the initial elastic stiffness, decompression load, and residual stiffness under lateral loading. Then, analysis of a reduced-scale three-storey two-bay PT steel frame is carried out with sufficient accuracy by incorporating the proposed joint model into the frame analysis. The proposed method is then applied to assessing progressive collapse of a one-storey two-bay PT frame under middle column removal scenario, and is verified against existing experimental and ANSYS finite element results. Three resistance mechanism for progressive collapse of the PT frame are evaluated, which consists of angle flexural mechanism, beam compression arching action and strand tensile catenary action. Finally, parameter analyses of the PT frames are conducted to investigate the effects of the connection details on the behavior and resistance of progressive collapse. The proposed model can be used to predict the quasi-static behavior of PT frames under monotonic vertical loading conditions with satisfactory accuracy.
 
Key Words
    component-based method; posttensioned connection; progressive collapse; SAP2000; steel frame
 
Address
Yan Fei Zhu,Ying Huang and Zhaohui Huang: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Chang Hong Chen: School of Mechanics and Civil Engineering, Northwestern Polytechnical University, Xi'an, 710129, China
Yao Yao: School of Civil Engineering, Xi;an University of Architecture and Technology, Xi'an, 710055, China;
School of Mechanics and Civil Engineering, Northwestern Polytechnical University, Xi'an, 710129, China
Leon M. Keer: Civil and Environmental Engineering, Northwestern University, Evanston, IL, 60286, USA

 

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