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Seismic Performance of Skewed Integral Bridges

Sarvazimi, Shokufeh | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56555 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. The purpose of this research is to evaluate skew integral abutment bridges. A bridge with an integral abutment bridge system is a type of bridge in which the expansion joint is removed so the connection between the abutment and the superstructure is rigid. Therefore, the superstructure and the substructure are integrated with each other and both participate in the lateral load of the structure under seismic or thermal forces. One of the important challenges in this type of bridges is the lack of analysis, tests and limited three-dimensional modeling. According to this, the understanding of the behavior of skew integral abutment bridges and the effects of soil-structure interaction in these bridge designs is inadequate. Due to the frame-shaped performance of these bridges, the degree of skew at the end of the bridges has a direct effect on the amount of soil stress on the structure, so that with the increase of the skew, asymmetric stresses to be applied from the soil to the structure that can lead to excess stresses on the abutments and lead to shear failure. The angle of skew can significantly increase the resistive force of the soil behind the substructure and affect the behavior of the soil-abutment system, which is caused by the rotation and transfer within the surface of the superstructure along with changes in the resistance of the soil behind the abutment. This study aims to improve the understanding of skew integral abutment bridges and their behavior by considering the non-linear behavior of piles under the abutment. Three-dimensional models will be used to accurately capture the effects of the skew angle of the bridge and soil-structure interaction. Modern methods will be employed to model these effects. The seismic performance of these bridges will be analyzed through parametric analysis, nonlinear incremental dynamic analysis (IDA), and fragility curves. The seismic behavior of bridge members is influenced by the angle of skew of the bridge. Increasing the skew angle leads to a decrease in member performance, particularly in the transverse direction. The reduction in structure performance varies depending on the type of soil behind the bridge. The Collapse Margin Ratio (CMR), obtained from incremental dynamic analysis results, serves as an indicator of the structure's collapse safety level. The findings indicate that as the bridge's skew angle increases, the probability of structure collapse rises and the CMR decreases
  9. Keywords:
  10. Seismic Behavior ; Bridges Seismic Behavior ; Integral Abutment Bridges ; Soil-Structure Interaction ; Parametric Analysis ; Fragility Curve ; Incremental Dynamic Analysis ; Skewed Bridges

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