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April 26, 2022Scientia IranicaOpen Access

Fragility Analysis of RC Bridges Considering Spatially Varying Ground Motions and SSI

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Authors

AHAziz HosseinnezhadAGAmin Gholizad

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Overview

Numerical modeling demonstrates increased seismic vulnerability in long-span reinforced concrete bridges under non-uniform ground motion and soil interactions, indicating elevated structural risks.

Key Points

  • To evaluate the seismic vulnerability and fragility of reinforced concrete curved bridges by accounting for spatially varying ground motions and soil-structure interactions across different structural dimensions and soil conditions.
  • Modeled three Caltrans reinforced concrete curved bridge prototypes featuring varying column heights and radii of curvature.
  • Generated spatially correlated, non-uniform displacement time histories using the conditional simulation method to capture wave-passage, incoherence, and site-response phenomena.
  • Conducted nonlinear dynamic response analyses incorporating diverse soil conditions and soil-structure interactions to generate limit-state fragility curves.
  • Non-uniform ground excitation markedly increased the probability of exceeding damage limit states, producing the most pronounced vulnerability in long-span bridges.
  • Soil-structure interaction showed negligible influence on failure probabilities for short-span bridges but significantly altered dynamic responses in long-span configurations.
  • Combined spatially varying ground motions and soil-structure interactions on soft soil deposits substantially amplified structural responses in long-span bridges.

Cite This Study

Hosseinnezhad et al. (2022) studied this question.

synapsesocial.com/papers/6a1ef6f2f3fddb4fc6b2fcaehttps://doi.org/10.24200/sci.2022.58039.5533
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