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- W3208196306 abstract "The propagation of vibration from underground railways is an important environmental issue, as it results in structure-borne noise and vibration which is both irritating to occupants and disruptive to operations. Due to the complexity of the railway-soil-foundation-building system, very few comprehensive models exist for the prediction of surface noise and vibration levels. Existing models have exceedingly-long computation times, making them unsuitable for evaluating design changes. For this reason, a model is sought which captures the essential dynamic behaviour of the system whilst using a minimal number of system parameters and requiring an under-five-minute runtime. The model presented in this paper is for a piled foundation, embedded in soil and subject to an incident wavefield generated by the existing Pipe-In-Pipe underground railway model. The piles are modelled as columns in axial vibration, and it is shown that this formulation can be extended to include Euler beams in lateral vibration. Whilst this model may neglect small amounts of cross-coupling between different vibration directions, the overall behaviour of the piles can be captured sufficiently using these one-dimensional models for axial and lateral vibration. The soil is modelled as a linear, elastic continuum and has the geometry of a thick-walled cylinder with an infinite outer radius and an inner radius equal to the radius of the pile. Pile-soil-pile interactions are accounted for by using the superposition of interaction factors; and the method of joining subsystems is used to incorporate the incident wavefield generated by the underground railway into the pile model. The resulting model is validated by comparison with those derived using complex numerical methods, namely FEM-BEM and BEM at all possible stages. Excellent agreement is observed in both the axial response of a single pile to a pile-head loading, and in the calculated interaction factors." @default.
- W3208196306 created "2021-11-08" @default.
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- W3208196306 date "2019-01-01" @default.
- W3208196306 modified "2023-09-27" @default.
- W3208196306 title "An efficient formulation for calculating the vibration response of piled foundations due to excitation by an underground railway" @default.
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