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A mixed-frame-of-reference model for railway induced soil-structure vibration interaction

A mixed-frame-of-reference model for railway induced soil-structure vibration interaction
A mixed-frame-of-reference model for railway induced soil-structure vibration interaction
When modelling the railway induced vibration in a building, three main aspects of the problem have to be considered: the vibration generation at the moving vehicle-track interaction points, the vibration propagation in the underlying infinite soil, and the vibration reception inside the building. This study proposes a computational modelling approach for predicting the full vibration propagation path from the train vehicles up to the building structure. The method includes a moving train model that is directly coupled to a stationary building structure, with interaction between them through the underlying soil using a single step solution procedure. A semi-analytical model is utilized to model the soil to which rigid objects and structures modelled by finite elements (FE) are coupled. The system is excited by a multi-body vehicle model passing over an irregular track. The proposed modelling approach uses the frequency-domain solution with some parts, such as the railway track, formulated in the moving frame of reference (FOR) and other parts, such as building structures, formulated in a fixed FOR. The coupling terms between the two FORs are found by utilizing an analytical formulation of receptance between the two FORs. It is shown that due to the coupling between the fixed and moving FORs, the previously uncoupled discrete frequencies become coupled through the other FOR as a result of the Doppler effect and wave scattering. Two solution procedures of the full system are pro-posed: partial coupling, where some secondary effects from reflected waves propagating through soil are disregarded, and full coupling, where the vehicle, track, soil and structure are modelled as a fully coupled system. Both proposed solution procedures offer a single-step approach for solving the whole system in the frequency-spatial domain. The application of the model is demonstrated and validated in two example cases: one analyzing a simple building structure near a railway track, using the partial coupling solution procedure, and another analyzing the behaviour of a vehicle model passing over a rigid block embedded inside the soil, using the full coupling solution procedure.
Soil-structure interaction, train induced vibration, mixed frame of reference
2700-2717
Bucinskas, Paulius
43f93600-479d-4af2-a4f2-76b51f58d7e0
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Andersen, Lars V.
de6f8f31-3bf2-49da-81d8-2cae2032d835
Bucinskas, Paulius
43f93600-479d-4af2-a4f2-76b51f58d7e0
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Andersen, Lars V.
de6f8f31-3bf2-49da-81d8-2cae2032d835

Bucinskas, Paulius, Ntotsios, Evangelos, Thompson, David and Andersen, Lars V. (2020) A mixed-frame-of-reference model for railway induced soil-structure vibration interaction. EURODYN 2020: XI International Conference on Structural Dynamics, Streamed, Athens, Greece. 23 - 26 Nov 2020. pp. 2700-2717 .

Record type: Conference or Workshop Item (Paper)

Abstract

When modelling the railway induced vibration in a building, three main aspects of the problem have to be considered: the vibration generation at the moving vehicle-track interaction points, the vibration propagation in the underlying infinite soil, and the vibration reception inside the building. This study proposes a computational modelling approach for predicting the full vibration propagation path from the train vehicles up to the building structure. The method includes a moving train model that is directly coupled to a stationary building structure, with interaction between them through the underlying soil using a single step solution procedure. A semi-analytical model is utilized to model the soil to which rigid objects and structures modelled by finite elements (FE) are coupled. The system is excited by a multi-body vehicle model passing over an irregular track. The proposed modelling approach uses the frequency-domain solution with some parts, such as the railway track, formulated in the moving frame of reference (FOR) and other parts, such as building structures, formulated in a fixed FOR. The coupling terms between the two FORs are found by utilizing an analytical formulation of receptance between the two FORs. It is shown that due to the coupling between the fixed and moving FORs, the previously uncoupled discrete frequencies become coupled through the other FOR as a result of the Doppler effect and wave scattering. Two solution procedures of the full system are pro-posed: partial coupling, where some secondary effects from reflected waves propagating through soil are disregarded, and full coupling, where the vehicle, track, soil and structure are modelled as a fully coupled system. Both proposed solution procedures offer a single-step approach for solving the whole system in the frequency-spatial domain. The application of the model is demonstrated and validated in two example cases: one analyzing a simple building structure near a railway track, using the partial coupling solution procedure, and another analyzing the behaviour of a vehicle model passing over a rigid block embedded inside the soil, using the full coupling solution procedure.

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More information

Published date: September 2020
Venue - Dates: EURODYN 2020: XI International Conference on Structural Dynamics, Streamed, Athens, Greece, 2020-11-23 - 2020-11-26
Keywords: Soil-structure interaction, train induced vibration, mixed frame of reference

Identifiers

Local EPrints ID: 445391
URI: http://eprints.soton.ac.uk/id/eprint/445391
PURE UUID: 30606099-4478-482e-b71c-05d4fb96fb59
ORCID for Evangelos Ntotsios: ORCID iD orcid.org/0000-0001-7382-0948
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906

Catalogue record

Date deposited: 07 Dec 2020 17:32
Last modified: 28 Apr 2022 02:09

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Contributors

Author: Paulius Bucinskas
Author: David Thompson ORCID iD
Author: Lars V. Andersen

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