Probabilistic evaluation of seismic vulnerability of multi-span ‎bridges in north of Iran

Document Type : Original Article

Authors

1 Associate Professor, Faculty of Civil Engineering, Noshirvani University of ‎Technology, Babol, Iran

2 PhD student in Civil Engineering, Faculty of Civil Engineering, Noshirvani University of ‎Technology, Babol, Iran

3 MSc of Structural Engineering, Faculty of Civil Engineering, Noshirvani University of ‎Technology, Babol, Iran

Abstract

Bridges are known as the most susceptible components of any and transportation system. That is why before the earthquake in vulnerability assessment, to take the necessary actions. The ‎generation of vulnerability functions in the form of fragility curves is a common approach for assessing bridges ‎seismic vulnerability. The purpose of this study, Using an analytical method for the production of ‎fragility curves for a road bridge in Mazandaran Province. Since this curves used for planning before and after the ‎earthquake, and in order to increase the reliability of them, in this study we tried to use the most accurate analytical ‎methods (non-linear time history analysis) and most prestigious modeling assumptions. Due to the specific ‎characteristics of far fault earthquakes, effects of such earthquakes on bridges have been investigated using fragility ‎curves. Due to the geometry of the bridge for exact analysis, bridges was under 100 pairs of earthquake ‎records in orthogonal directions and fragility curves was drawn and then were compared. Observed that changing the diameter of the bridge piers affect how much on the. One of ‎the common simplifications used in modeling are: elimination of abutment and foundation and pile by fixing the ‎abutment and foundations in modeling. It can be seen that by eliminating this effect, increase the median values of ‎fragility and in fact to reduce probability of vulnerability in Charts. After time history analysis it was found that by ‎reducing the diameter of the piers, relative displacement (drift) in the longitudinal direction and in the transverse ‎direction increases.

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Main Subjects

References

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History

  • Receive Date: 26 November 2016
  • Revise Date: 11 May 2017
  • Accept Date: 31 May 2017

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