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Sensitivity Study of the Pressure-Dependent Soil Model Based on the Abutment-Backfill Pushover Behaviour
The abutment-backfill system contributes a significant value in transferring laterally and vertically generated forces from the bridge deck to the foundations on either end of the bridge. The soil used as the backfill material affects the maximum force demand at a certain allowable horizontal displacement of the abutment wall. The numerical modelling of the abutment-backfill system includes a proper understanding of the soil constitutive model and soil-structure interaction effects. It is necessary to assess the relative influence of the considered soil model parameters before using the model in replicating the backfill soil behaviour. In the present study, a continuum 2D finite element model of the abutment-backfill system is developed simulating the UCLA abutment experiment. The PressureDependMultiYield02 material model available in OpenSees is adopted to simulate the dense silty sand placed behind the abutment wall in UCLA experiment. The developed FEM model supported by the calibrated pressure-dependent multi-yield model parameters generates the backbone curve that matches quite well with that in the available literature. Sensitivity analyses are further carried out to get more insight into the relative contribution of the model parameters on the pushover behaviour of the abutment. The effects of the reference elastic modulus and phase transformation angle are found to be maximal and minimal on the lateral force demand, respectively, where both the methods agree well with each other.
Sensitivity Study of the Pressure-Dependent Soil Model Based on the Abutment-Backfill Pushover Behaviour
The abutment-backfill system contributes a significant value in transferring laterally and vertically generated forces from the bridge deck to the foundations on either end of the bridge. The soil used as the backfill material affects the maximum force demand at a certain allowable horizontal displacement of the abutment wall. The numerical modelling of the abutment-backfill system includes a proper understanding of the soil constitutive model and soil-structure interaction effects. It is necessary to assess the relative influence of the considered soil model parameters before using the model in replicating the backfill soil behaviour. In the present study, a continuum 2D finite element model of the abutment-backfill system is developed simulating the UCLA abutment experiment. The PressureDependMultiYield02 material model available in OpenSees is adopted to simulate the dense silty sand placed behind the abutment wall in UCLA experiment. The developed FEM model supported by the calibrated pressure-dependent multi-yield model parameters generates the backbone curve that matches quite well with that in the available literature. Sensitivity analyses are further carried out to get more insight into the relative contribution of the model parameters on the pushover behaviour of the abutment. The effects of the reference elastic modulus and phase transformation angle are found to be maximal and minimal on the lateral force demand, respectively, where both the methods agree well with each other.
Sensitivity Study of the Pressure-Dependent Soil Model Based on the Abutment-Backfill Pushover Behaviour
Lecture Notes in Civil Engineering
Muthukkumaran, Kasinathan (editor) / Ayothiraman, R. (editor) / Kolathayar, Sreevalsa (editor) / Bagchi, Aritra (author) / Raychowdhury, Prishati (author)
Indian Geotechnical Conference ; 2021 ; Trichy, India
Soil Dynamics, Earthquake and Computational Geotechnical Engineering ; Chapter: 13 ; 129-139
2023-01-01
11 pages
Article/Chapter (Book)
Electronic Resource
English
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