The Influence of Complex Dynamic Phenomena Caused by Wind Action on Behaviour of Transportation Pipelines

Abstract:

The main transportation pipelines are subjected to complex stresses resulting from the nature and state of the transported material, the operating conditions, and the environmental factors and so on. Thus, the stress in the pipe wall is generated and influenced by the pressure, the temperature and the mass of the transported fluid, by the weight of the pipe, the ambient temperature and in certain periods of time by the wind speed. In this paper are presented dynamic phenomena generated by wind flow and their effect on the magistrate transportation pipelines. The content of the paper presents an detailed analysis regarding the regimes in which is developing the force generated by Karman vortex and the situation when resonance phenomena are developed. The study presents a mathematical model that describes the dynamic phenomena generated by the wind action, determining the mathematical expression of the aerodynamic force that act on the normal direction to the wind speed. This force is having a periodic variation, its size and the frequency variation is dependent on the wind speed. Some methods are proposed in order to decrease the wind influence on the lifetime of transportation pipelines. The main results of the study are: determination of the speed range for which the dynamic phenomena have a high influence on the pipeline lifetime; determination of the real conditions that can lead to sharp rises of the pipe deformations; determination of the pipeline lifetime reduction under development of dynamic loads.

• Periodical: Advanced Materials Research (Volume 837)
• Pages: 170-174
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.837.170
• Online since: November 2013
• Authors: Gheorghe Pintilie
• Keywords: Amplitude, Complex Elastic Modulus, Elastic Constant, Elongation, Forced Vibration, Periodical Loads

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DOI: 10.1061/jmcea3.0002725

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DOI: 10.1007/bf03182196