This paper describes an original approach to the study of the seismic behaviour of bridge abutments. The proposed method incorporates a simplified description of the dynamic response of the bridge structure into a finite-element model of the soil-abutment system. Specifically, the dynamic behaviour of the bridge structure is described by a macro-element that simulates the loads transferred to the abutment during the seismic event. The macro-element is identified using a structural model of the bridge as a reference. This approach improves the current analysis methods based on sub-structuring, limiting at the same time the computational demand needed for a complete study of the soil-structure interaction. In the paper, the validity of the procedure is demonstrated comparing the results of the simplified approach with the results obtained from full three-dimensional dynamic analyses of idealised soil-bridge systems, using nonlinear advanced constitutive models to describe the soil behaviour. Based on these results, a strategy is devised for the calibration of the bridge macro-element, making use of a limited number of input parameters.
A macro-element approach to analyse bridge abutments accounting for the dynamic behaviour of the superstructure / Gorini, Davide Noè; Callisto, Luigi. - In: GEOTECHNIQUE. - ISSN 0016-8505. - 70:8(2020), pp. 711-719. [10.1680/jgeot.19.ti.012]
A macro-element approach to analyse bridge abutments accounting for the dynamic behaviour of the superstructure
Gorini, Davide NoèPrimo
;Callisto, Luigi
Secondo
2020
Abstract
This paper describes an original approach to the study of the seismic behaviour of bridge abutments. The proposed method incorporates a simplified description of the dynamic response of the bridge structure into a finite-element model of the soil-abutment system. Specifically, the dynamic behaviour of the bridge structure is described by a macro-element that simulates the loads transferred to the abutment during the seismic event. The macro-element is identified using a structural model of the bridge as a reference. This approach improves the current analysis methods based on sub-structuring, limiting at the same time the computational demand needed for a complete study of the soil-structure interaction. In the paper, the validity of the procedure is demonstrated comparing the results of the simplified approach with the results obtained from full three-dimensional dynamic analyses of idealised soil-bridge systems, using nonlinear advanced constitutive models to describe the soil behaviour. Based on these results, a strategy is devised for the calibration of the bridge macro-element, making use of a limited number of input parameters.File | Dimensione | Formato | |
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