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Dynamic Response of a Beam on a Layered Half-Space with a Poroelastic Interlayer Subjected to Moving Loads
Vibration of a soil-structure system due to dynamic loads is a classical problem in transportation geotechnics. This paper investigates dynamic response of a practical stratified ground model coupled with a beam in the vicinity of moving loads. The ground consists of alternate distribution of different media: an elastic layer, a poroelastic interlayer and an elastic half-space from top to bottom, which considers soils of different properties and the existence of groundwater. Fourier transform and ‘adapted stiffness matrix method’ are applied to derive solutions to the system in the frequency-wavenumber domain. Inverse Fourier transform is applied through numerical integration to obtain results in the time-spatial domain. The method is then verified by comparing with existing research. Finally, influences of load characteristics, beam stiffness, groundwater existence on vibrations of the coupled system are comprehensively investigated. Main conclusions are drawn as follows: A ‘critical speed’ exists for vertical displacement of the beam, and it occurs due to the first wave propagation mode of the system. The existence of groundwater significantly influences vertical displacement of the beam. The influence substantially increases with load speed.
Dynamic Response of a Beam on a Layered Half-Space with a Poroelastic Interlayer Subjected to Moving Loads
Vibration of a soil-structure system due to dynamic loads is a classical problem in transportation geotechnics. This paper investigates dynamic response of a practical stratified ground model coupled with a beam in the vicinity of moving loads. The ground consists of alternate distribution of different media: an elastic layer, a poroelastic interlayer and an elastic half-space from top to bottom, which considers soils of different properties and the existence of groundwater. Fourier transform and ‘adapted stiffness matrix method’ are applied to derive solutions to the system in the frequency-wavenumber domain. Inverse Fourier transform is applied through numerical integration to obtain results in the time-spatial domain. The method is then verified by comparing with existing research. Finally, influences of load characteristics, beam stiffness, groundwater existence on vibrations of the coupled system are comprehensively investigated. Main conclusions are drawn as follows: A ‘critical speed’ exists for vertical displacement of the beam, and it occurs due to the first wave propagation mode of the system. The existence of groundwater significantly influences vertical displacement of the beam. The influence substantially increases with load speed.
Dynamic Response of a Beam on a Layered Half-Space with a Poroelastic Interlayer Subjected to Moving Loads
Lecture Notes in Civil Engineering
Tutumluer, Erol (editor) / Nazarian, Soheil (editor) / Al-Qadi, Imad (editor) / Qamhia, Issam I.A. (editor) / Li, Yicheng (author) / Zhang, Xiaolei (author) / Feng, Shijin (author)
2021-08-31
11 pages
Article/Chapter (Book)
Electronic Resource
English
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