Earthquakes and Structures

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Effect of connection stiffness on the earthquake-induced progressive collapse

  • Ali, Seyedkazemi (Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University) ;
  • Mohammad Motamedi, Hour (Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University)
  • Received : 2021.06.30
  • Accepted : 2022.12.05
  • Published : 2022.12.25
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Abstract

Global or partial damage to a structure due to the failure of gravity or lateral load-bearing elements is called progressive collapse. In the present study, the alternate load path (ALP) method introduced by GSA and UFC 4-023-03 guidelines is used to evaluate the progressive collapse in special steel moment-resisting frame (SMRF) buildings. It was assumed that the progressive collapse is due to the earthquake force and its effects after the removal of the elements still remain on the structures. Therefore, nonlinear dynamic time history analysis employing 7 earthquake records is used to investigate this phenomenon. Internal and external column removal scenarios are investigated and the stiffness of the connections is changed from semi-rigid to rigid. The results of the analysis performed in the OpenSees program show that the loss of the bearing capacity of an exterior column due to a seismic event and the occurrence of progressive collapse can increase the inter-story drift of the structure with semi-rigid connections by more than 50% and make the structure unable to satisfy the life safety performance level. Furthermore, connection stiffness severely affects the redistribution of forces and moments in the adjacent elements of the removed column.

Keywords

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