Dynamic Responses of Buried Pipelines

by Bulent A. Ovunc, Univ of Southwestern Louisiana, Lafayette, LA, USA,



Document Type: Proceeding Paper

Part of: Advances in Underground Pipeline Engineering

Abstract:

The dynamic responses of the pipelines are analyzed by the continuous mass matrix method by considering the soil as a bounded plane in which the pipeline is placed. The friction between the pipe and the soil and the friction between two pipes at the joints are assumed such that the geometrical continuity along the interface of the two elements holds till the friction stress along the interface reaches its maximum value, then the slippage starts. The slippage continues as long as the relative displacement on the interface increases. The geometrical continuity is restored at the moment when the relative displacement starts to decrease. Modal analysis is used as long as the behavior of the system is linear and the temporal part of all the external dynamic loads are proportional to the same time function. Otherwise the analysis is performed by numerical integration. The effects of various parameters are investigated for the free and forced vibration of the soil-pipeline system.

Subject Headings: Buried pipes | Soil-pipe interaction | Soil analysis | Soil dynamics | Dynamic response | Dynamic analysis | Pipe joints

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