Earthquakes and Structures

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Seismic reliability assessment of base-isolated structures using artificial neural network: operation failure of sensitive equipment

  • Moeindarbari, Hesamaldin (Civil and Environmental Engineering Department Amirkabir University of Technology) ;
  • Taghikhany, Touraj (Civil and Environmental Engineering Department Amirkabir University of Technology)
  • Received : 2017.05.24
  • Accepted : 2018.03.16
  • Published : 2018.05.25
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Abstract

The design of seismically isolated structures considering the stochastic nature of excitations, base isolators' design parameters, and superstructure properties requires robust reliability analysis methods to calculate the failure probability of the entire system. Here, by applying artificial neural networks, we proposed a robust technique to accelerate the estimation of failure probability of equipped isolated structures. A three-story isolated building with susceptible facilities is considered as the analytical model to evaluate our technique. First, we employed a sensitivity analysis method to identify the critical sources of uncertainty. Next, we calculated the probability of failure for a particular set of random variables, performing Monte Carlo simulations based on the dynamic nonlinear time-history analysis. Finally, using a set of designed neural networks as a surrogate model for the structural analysis, we assessed once again the probability of the failure. Comparing the obtained results demonstrates that the surrogate model can attain precise estimations of the probability of failure. Moreover, our proposed approach significantly increases the computational efficiency corresponding to the dynamic time-history analysis of the structure.

Keywords

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