Finite-difference analysis of seismic response in connected underground and aboveground pipelines

This article presents a theoretical and practical study of the dynamic behavior of a long-segment underground and aboveground pipeline system connected by couplings under the influence of seismic waves. The method of explicit finite differences was used to solve the dynamic equations of the pipeline, and the interaction between the pipeline and the couplings was modeled by linear and ideal elastic-plastic models. In the course of the research, the vibration states and deformation processes of the pipeline and the couplings were analyzed. Based on the results obtained, the role of the couplings in reducing vibrations and important conclusions and recommendations for engineering practice are presented.

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