Steel and Composite Structures

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Dynamic increase factor for progressive collapse of semi-rigid steel frames with extended endplate connection

  • Huang, Ying (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wu, Yan (School of Mechanical and Civil Engineering, Northwestern Polytechnical University) ;
  • Chen, Changhong (School of Mechanical and Civil Engineering, Northwestern Polytechnical University) ;
  • Huang, Zhaohui (Department of Civil and Environmental Engineering, Brunel University) ;
  • Yao, Yao (School of Mechanical and Civil Engineering, Northwestern Polytechnical University)
  • Received : 2019.01.28
  • Accepted : 2019.05.03
  • Published : 2019.06.25
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Abstract

As an extremely destructive accident, progressive collapse is defined as the spread of an initial local failure from element to element, resulting eventually in the collapse of an entire structure or disproportionately large of it. To prevent the occurrence of it and evaluate the ability of structure resisting progressive collapse, the nonlinear static procedure is usually adopted in the whole structure design process, which considered dynamic effect by utilizing Dynamic Increase Factor (DIF). In current researches, the determining of DIF is performed in full-rigid frame, however, the performance of beam-column connection in the majority of existing frame structures is not full-rigid. In this study, based on the component method proposed by EC3 guideline, the expression of extended endplate connection performance is further derived, and the connection performance is taken into consideration when evaluated the performance of structure resisting progressive collapse by applying the revised plastic P-M hinge. The DIF for structures with extended endplate beam-column connection have been determined and compared with the DIF permitted in current GSA guideline, the necessity of considering connection stiffness in determining the DIF have been proved.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Shanxi National Science Foundation of China, China Scholarship Council, Central Universities

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