Steel and Composite Structures

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Probabilistic sensitivity analysis of multi-span highway bridges

  • Bayat, M. (Department of Civil and Environmental Engineering, Tarbiat Modares University) ;
  • Daneshjoo, F. (Department of Civil and Environmental Engineering, Tarbiat Modares University) ;
  • Nistico, N. (Department of Structural and Geotechnical Engineering, Universita degli Studi di Roma "La Sapienza")
  • Received : 2014.12.11
  • Accepted : 2015.04.29
  • Published : 2015.07.25
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Abstract

In this study, we try to compare different intensity measures for evaluating nonlinear response of bridge structure. This paper presents seismic analytic fragility of a three-span concrete girder highway bridge. A complete detail of bridge modeling parameters and also its verification has been presented. Fragility function considers the relationship of intensities of the ground motion and probability of exceeding certain state of damage. Incremental dynamic analysis (IDA) has been subjected to the bridge from medium to strong ground motions. A suite of 20 earthquake ground motions with different range of PGAs are used in nonlinear dynamic analysis of the bridge. Complete sensitive analyses have been done on the response of bridge and also efficiency and practically of them are studied to obtain a proficient intensity measure for these types of structure by considering its sensitivity to the period of the bridge. Three dimensional finite element (FE) model of the bridge is developed and analyzed. The numerical results show that the bridge response is very sensitive to the earthquake ground motions when PGA and Sa (Ti, 5%) are used as intensity measure (IM) and also indicated that the failure probability of the bridge system is dominated by the bridge piers.

Keywords

References

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