Earthquakes and Structures

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Empirical seismic fragility rapid prediction probability model of regional group reinforced concrete girder bridges

  • Li, Si-Qi (School of Civil Engineering, Heilongjiang University) ;
  • Chen, Yong-Sheng (Institute of Engineering Mechanics, China Earthquake Administration) ;
  • Liu, Hong-Bo (School of Civil Engineering, Heilongjiang University) ;
  • Du, Ke (School of Civil Engineering, Heilongjiang University)
  • Received : 2022.04.16
  • Accepted : 2022.06.12
  • Published : 2022.06.25
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Abstract

To study the empirical seismic fragility of a reinforced concrete girder bridge, based on the theory of numerical analysis and probability modelling, a regression fragility method of a rapid fragility prediction model (Gaussian first-order regression probability model) considering empirical seismic damage is proposed. A total of 1,069 reinforced concrete girder bridges of 22 highways were used to verify the model, and the vulnerability function, plane, surface and curve model of reinforced concrete girder bridges (simple supported girder bridges and continuous girder bridges) considering the number of samples in multiple intensity regions were established. The new empirical seismic damage probability matrix and curve models of observation frequency and damage exceeding probability are developed in multiple intensity regions. A comparative vulnerability analysis between simple supported girder bridges and continuous girder bridges is provided. Depending on the theory of the regional mean seismic damage index matrix model, the empirical seismic damage prediction probability matrix is embedded in the multidimensional mean seismic damage index matrix model, and the regional rapid prediction matrix and curve of reinforced concrete girder bridges, simple supported girder bridges and continuous girder bridges in multiple intensity regions based on mean seismic damage index parameters are developed. The established multidimensional group bridge vulnerability model can be used to quantify and predict the fragility of bridges in multiple intensity regions and the fragility assessment of regional group reinforced concrete girder bridges in the future.

Keywords

Acknowledgement

The bridge sample data of this study were derived from the seismic damage investigation database of the China Earthquake Administration (CAE) and the Wenchuan earthquake damage investigation team of the Institute of Engineering Mechanics of CAE.

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