Earthquakes and Structures

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Blast fragility of base-isolated steel moment-resisting buildings

  • Dadkhah, Hamed (Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili) ;
  • Mohebbi, Mohtasham (Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili)
  • Received : 2021.01.12
  • Accepted : 2021.08.26
  • Published : 2021.11.25
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Abstract

Strategic structures are a potential target of the growing terrorist attacks, so their performance under explosion hazard has been paid attention by researchers in the last years. In this regard, the aim of this study is to evaluate the blast-resistance performance of lead-rubber bearing (LRB) base isolation system based on a probabilistic framework while uncertainties related to the charge weight and standoff distance have been taken into account. A sensitivity analysis is first performed to show the effect of explosion uncertainty on the response of base-isolated buildings. The blast fragility curve is then developed for three base-isolated steel moment-resisting buildings with different heights of 4, 8 and 12 stories. The results of sensitivity analysis show that although LRB has the capability of reducing the peak response of buildings under explosion hazard, this control system may lead to increase in the peak response of buildings under some explosion scenarios. This shows the high importance of probabilistic-based assessment of isolated structures under explosion hazard. The blast fragility analysis shows effective performance of LRB in mitigating the probability of failure of buildings. Therefore, LRB can be introduced as effective control system for the protection of buildings from explosion hazard regarding uncertainty effect.

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References

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