Steel and Composite Structures

  • 제40권4호
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  • Pages.481-493
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  • 2021
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Component-based model for posttensioned steel connections against progressive collapse

  • Zhu, Yan Fei (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Chen, Chang Hong (School of Mechanics and Civil Engineering, Northwestern Polytechnical University) ;
  • Huang, Ying (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Huang, Zhaohui (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yao, Yao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Keer, Leon M. (Civil and Environmental Engineering, Northwestern University)
  • 투고 : 2019.07.15
  • 심사 : 2021.07.09
  • 발행 : 2021.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

The authors would like to acknowledge the financially supported by the National Natural Science Foundation of China (51408489, 51248007, 51308448, 51301136 and 51508464), the Shanxi National Science Foundation of China (2017JM5007), China Scholarship Council and the Fundamental Research Funds for the Central Universities (3102014JCQ01047).

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