Structural Engineering and Mechanics

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Mitigation of progressive collapse in steel structures using a new passive connection

  • Mirtaheri, Masoud (Department of Civil Engineering, K.N.Toosi University of Technology) ;
  • Emami, Fereshteh (Department of civil engineering, Science and Research Branch, Islamic Azad University) ;
  • Zoghi, Mohammad A. (Department of Civil Engineering, K.N.Toosi University of Technology) ;
  • Salkhordeh, Mojtaba (Department of Civil Engineering, K.N.Toosi University of Technology)
  • Received : 2019.04.11
  • Accepted : 2019.05.10
  • Published : 2019.05.25
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Abstract

If an alternative path would not be considered for redistribution of loads, local failure in structures will be followed by a progressive collapse. When a vertical load-bearing element of a steel structure fails, the beams connected to it will lose their support. Accordingly, an increase in span's length adds to the internal forces in beams. The mentioned increasing load in beams leads to amplifying the moments there, and likewise in their corresponding connections. Since it is not possible to reinforce all the elements of the structure against this phenomenon, it seems rational to use other technics like specified strengthened connections. In this study, a novel connection is suggested to handle the stated phenomenon which is introduced as a passive connection. This connection enables the structure to tolerate the added loads after failing of the vertical element. To that end, two experimental models were constructed and thereafter tested in half-scale, one-story, double-bay, and bolted connections in three-dimensional spaces. This experimental study has been conducted to compare the ductility and strength of a frame that has ordinary rigid connections with a frame containing a novel passive connection. At last, parametric studies have been implemented to optimize the dimensions of the passive connection. Results show that the load-bearing capacity of the frame increased up to 75 percent. Also, a significant decrease in the displacement of the node wherein the column is removed was observed compared to the ordinary moment resisting frame with the same loads.

Keywords

References

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