Analysis of Behaviour of Axial Vibration of Buried Pipelines By Travelling Wave Method

Abstract:

Considering soilstructure interaction (SSI) and fluidstructure interaction (FSI), the axial vibration of a buried pipeline is analyzed with traveling wave method.The effectiveness of the algorithm is verified by an experiment.The influence of Poisson coupling, junction coupling and soil properties is studied in a numerical example.The numerical results show that amplitudes of vibration increase remarkably at some low frequencies when Poisson coupling is considered.If the fluid being ignored or just being regarded as a rigid filler,the characteristic of the system cannot be reflected,which may result in system risk under some lowfrequency dynamic actions.Due to the change of boundary conditions, junction coupling reduces the natural frequencies of the system.The natural frequencies of the system increase when the shear stiffness of soil increases.Soil damping reduces the amplitudes notably, but has little effect on the frequency of the system.