In this paper,the basic theory of dynamic infinite element is discussed,and an input method for ground mo-tion at the boundary surface of the infinite element by non-uniform excitation is proposed.Then,on condition that the bond slip effect between pipelines and soil is involved,a refined model of buried pipelines,which couples three-dimensional finite element with infinite element,is established by using dynamic infinite element bounda-ries.The dynamic response of buried pipelines by the non-uniform seismic wave excitation is numerically ana-lyzed.The values of the calculation range of the soil around the pipeline are systematically studied,and the effec-tive width W,the effective length L,and the effective depth H of the soil around the pipeline are given.The results indicate that the value of W is closely related to the pipe diameter D;H can be taken between 30-60 m,and L should include at least one wavelength of the predominant period of the ground motion.In this case,the results can meet most engineering requirements.
buried pipelineinfinite elementboundary conditionfinite element analysispipe-soil inter-action
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