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Steel and Composite Structures
  Volume 31, Number 6, June25 2019 , pages 617-628

Dynamic increase factor for progressive collapse of semi-rigid steel frames with extended endplate connection
Ying Huang, Yan Wu, Changhong Chen, Zhaohui Huang and Yao Yao

    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.
Key Words
    Dynamic Increase Factor (DIF); extended endplate connection; the component method; the revised P-M hinge
(1) Ying Huang:
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China;
(2) Yan Wu, Changhong Chen, Yao Yao:
School of Mechanical and Civil Engineering, Northwestern Polytechnical University, Xi'an, 710129, China;
(3) Zhaohui Huang:
Department of Civil and Environmental Engineering, Brunel University, Uxbridge, Middlesex UB8 3PH, UK.

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