Abstract
Multi-field coupling system in the paper is composed of the corroded pipelines, fluid, heat preservation layers and frost -heaving soil, and the buried pipelines are inevitable to be affected by earthquakes, but few studies have been done on corroded pipelines in multi-field coupling under seismic loading in cold regions. The paper analyzes the dynamic response of the pipelines under seismic loading. Method by FEM (finite element method), the three-dimensional multi-field coupling mechanics model has been established for analysis, based on a thermal-fluid-solid multi-field coupling analysis theory, considering the actual stress-strain characteristics of the pipeline steel and the frost heaving force of soil. Meanwhile, the influences of fluid pressure, fluid temperature, corrosion defects and seismic waves on the mechanical properties of the pipelines are then discussed. The results show that: the relative corrosion depth, fluid pressure and fluid temperature have obvious influence on the mechanical properties of corroded pipelines; other factors are relatively weak; the properties of corroded pipelines do not change with different seismic loading. For the corroded pipelines in cold regions, the factors which have obvious influence on the mechanical properties of pipelines should be monitored intensely.
Highlights
With the increasing demand for oil and gas resources in China, the pipelines in cold regions have found an increasingly wide utilization, which play a more and more important role in the development of national economy
Aiming at the above problems, FEM is used to analyze the dynamic response of the buried corroded pipelines in cold regions considering the multi-field coupling effect, and the mechanical properties of the pipelines changed with fluid temperature, fluid
The results show that for the different influence factors, the relative corrosion depth, the fluid pressure and the fluid temperature have obvious influence on the mechanical characteristics of the pipeline with double corrosion defects, the relative corrosion width comes second, and the relative corrosion length has less influence on it
Summary
With the increasing demand for oil and gas resources in China, the pipelines in cold regions have found an increasingly wide utilization, which play a more and more important role in the development of national economy. The researches on pipelines in cold regions at home and abroad mainly include the stress, strain, displacement of pipelines [4,5,6,7], stability analysis [3, 8], wall thickness selection [9] and so on under the action of frost heaving [2]. The pipelines in cold regions together with the particular environment compose a multi-field coupling system. There is little research about the corroded pipelines in cold regions considering the seismic loading and the multi-field coupling effect. Aiming at the above problems, FEM (finite element method) is used to analyze the dynamic response of the buried corroded pipelines in cold regions considering the multi-field coupling effect, and the mechanical properties of the pipelines changed with fluid temperature, fluid. MULTI-FIELD COUPLING DYNAMIC RESPONSE ANALYSIS OF PIPELINES WITH DOUBLE CORROSION DEFECTS UNDER SEISMIC LOADING IN COLD REGIONS. The results can provide an analytical method and a theoretical basis for the integrity evaluation of pipelines in cold regions
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