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Earthquakes and Structures
  Volume 9, Number 3, September 2015 , pages 639-656

Effect of base isolation systems on increasing the resistance of structures subjected to progressive collapse
Hamid R. Tavakoli, Fahime Naghavi and Ali R. Goltabar

    Seismic isolation devices are commonly used to mitigate damages caused by seismic responses of structures. More damages are created due to progressive collapse in structures. Therefore, evaluating the impact of the isolation systems to enhance progressive collapse-resisting capacity is very important. In this study, the effect of lead rubber bearing isolation system to increase the resistance of structures against progressive collapse was evaluated. Concrete moment resisting frames were used in both the fixed and baseisolated model structures. Then, progressive collapse-resisting capacity of frames was investigated using the push down nonlinear static analysis under gravity loads that specified in GSA guideline. Nonlinear dynamic analysis was performed to consider dynamic effects column removal under earthquake. The results of the push down analysis are highly dependent on location of removal column and floor number of buildings. Also, seismic isolation system does not play an effective role in increasing the progressive collapse-resisting capacities of structures under gravity loads. Base isolation helps to localize failures and prevented from spreading it to intact span under seismic loads.
Key Words
    base isolation; seismic loads; progressive collapse; column removal; push down analysis; nonlinear time history analysis
Hamid R. Tavakoli, Fahime Naghavi and Ali R. Goltabar: Department of Earthquake Engineering, Babol University and Technology, Babol, Iran

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