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Reliability-based design of semi-rigidly connected base-isolated buildings subjected to stochastic near-fault excitations

  • Hadidi, Ali (Department of Civil Engineering, University of Tabriz) ;
  • Azar, Bahman Farahmand (Department of Civil Engineering, University of Tabriz) ;
  • Rafiee, Amin (Department of Civil Engineering, University of Tabriz)
  • Received : 2016.04.02
  • Accepted : 2016.10.05
  • Published : 2016.10.25

Abstract

Base isolation is a well-established passive strategy for seismic response control of buildings. In this paper, an efficient framework is proposed for reliability-based design optimization (RBDO) of isolated buildings subjected to uncertain earthquakes. The framework uses reduced function evaluations method, as an efficient tool for structural reliability analysis, and an efficient optimization algorithm for optimal structural design. The probability of failure is calculated considering excessive base displacement, superstructure inter-storey drifts, member stress ratios and absolute accelerations of floors of the isolated building as failure events. The behavior of rubber bearing isolators is modeled using nonlinear hysteretic model and the variability of future earthquakes is modeled by applying a probabilistic approach. The effects of pulse component of stochastic near-fault ground motions, fixity-factor of semi-rigid beam-to-column connections, values of isolator parameters, earthquake magnitude and epicentral distance on the performance and safety of semi-rigidly connected base-isolated steel framed buildings are studied. Suitable RBDO examples are solved to illustrate the results of investigations.

Keywords

reduced function evaluations;near-field earthquakes;optimization;base-isolation;rubber bearings;semi-rigid connections

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