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Progressive collapse assessment of multistory reinforced concrete structures subjected to seismic actions

Abstract

Progressive collapse is a catastrophic partial or total failure of a structure that mostly occurs when a structure loses a primary component like a column. Some international standards have started to consider progressive collapse resistance in various approaches. In this study, the ‘Unified Facilities Criterion’ guidelines were used in assessing the structure; these guidelines represent one of the codes that discuss progressive collapse using sophisticated approaches. Three-dimensional nonlinear dynamic analyses using the ‘Applied Element Method’ were performed for a structure that lost a column during a seismic action. A parametric study was made to investigate the effect of different parameters on progressive collapse. In this study, a primary structural component was assumed lost during an earthquake. The studied parameters were the location of the removed column in plan, the level of the removed column, the case of loading, and the consideration of the slabs. For the study cases, it was concluded that the buildings designed according to the Egyptian code satisfies the progressive collapse requirements stated by ‘Unified Facilities Criteria’ (UFC) guidelines requirements with a safety factor of 1.97. Also, it was found that losing a column during a seismic action is more critical for progressive collapse than under gravity load. Finally, this study elaborated the importance of considering the slab in progressive collapse analysis of multistory buildings in order to include the significant catenary action developed by the slabs.

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Correspondence to Ahmed Elshaer.

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Elshaer, A., Mostafa, H. & Salem, H. Progressive collapse assessment of multistory reinforced concrete structures subjected to seismic actions. KSCE J Civ Eng 21, 184–194 (2017). https://doi.org/10.1007/s12205-016-0493-6

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Keywords

  • progressive collapse
  • seismic loads
  • applied elements
  • catenary action
  • UFC