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Evaluation of vierendeel peripheral frame as supporting structural element for prevention of progressive collapse

  • Khaloo, Alireza (Department of Civil Engineering, Sharif University of Technology) ;
  • Omidi, Hossein (Department of Civil Engineering, Sharif University of Technology)
  • Received : 2017.09.30
  • Accepted : 2017.12.16
  • Published : 2018.03.10

Abstract

Progressive building collapse occurs when failure of a structural component leads to the failure and collapse of surrounding members, possibly promoting additional failure. Global system collapse will occur if the damaged system is unable to reach a new static equilibrium configuration. The most common type of primary failure which led to the progressive collapse phenomenon, is the sudden removal of a column by various factors. In this study, a method is proposed to prevent progressive collapse phenomena in structures subjected to removal of a single column. A vierendeel peripheral frame at roof level is used to redistribute the removed column's load on other columns of the structure. For analysis, quasi-static approach is used which considers various load combinations. This method, while economically affordable is easily applicable (also for new structures as well as for existing structures and without causing damage to their architectural requirements). Special emphasis is focused on the evolution of vertical displacements of column removal point. Even though additional stresses and displacements are experienced by removal of a structural load bearing column, the proposed method considerably reduces the displacement at the mentioned point and prevents the collapse of the structural frame.

Keywords

steel moment frames;progressive collapse;structural failures;vierendeel frame;column removal

Acknowledgement

Supported by : National Science Foundation

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