English

Vol. 8 4, 2018 p 377-383

Pages

Article name, authors, abstract and keyword

377-383

Features of analysis of main pipelines seismic resistance

Nikolay . Makhutov a,b, Alexander O. Chernyavsky c,d

a Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a Sevastopolsky prospect, Moscow, 117186, Russian Federation
b Mechanical Engineering Research Institute of the Russian Academy of Sciences (MERI RAS), 4 Maly Kharitonyevsky pereulok, Moscow, 101990, Russian Federation
c South Ural State University (National Research University), 76 Lenin prospect, Chelyabinsk, 454080, Russian Federation
d Science and Engineering Centre Reliability and Safety of Large Systems and Machines, Ural Branch of Russian Academy of Sciences, 54a Studencheskaya Str., Ekaterinburg, 620049, Russian Federation

DOI: 10.28999/2541-9595-2018-8-4-377-383

Abstract: The problems of stress analysis in main underground pipelines under seismic action are considered. It is shown that the bending stresses arising in the pipeline during the passage of a seismic wave are small and should not entail dangerous consequences for it (except for areas with high local stresses: surroundings of defects, bends, T-pipe). A significant danger is represented by large soil movements, which can occur in zones of tectonic faults. In these cases, the soil displacement can be estimated at meters, which should lead to high stresses.
To analyze the stresses arising in a pipe in a soil movement zone, the finite element method implemented in the LS-DYNA program was used. It is shown that taking large deformations into account when using Lagranges formulation requires the exclusion of some of the elements from the model during the calculation and leads to errors that do not go to the safety factor. The combined approach (the Lagrange approach for a pipe whose deformations are not too large and the Euler approach for the soil) is free of this shortcoming and provides an opportunity to analyze the consequences of large soil displacements. A fully parameterized model is developed that allows to make calculations on comparison of the effectiveness of various measures with a minimum labor input from the developer: changes in the profile of the trench (which is particularly important for horizontal displacements), properties and thickness of the backfill layer, properties and wall thickness of the pipe material. As one of the non-standard methods to ensure safety, the use of pipes with ribs is considered.

Keywords: pipeline, seismic capacity, finite elements method.

For citation:
Makhutov N. A., Chernyavsky A. O. Features of analysis of main pipelines seismic resistance. Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktovScience & Technologies: Oil and Oil Products Pipeline Transportation. 2018;8(4):377383. DOI: 10.28999/2541-9595-2018-8-4-377-383.

References:
[1] Shang B., Li C., Lu H. Stress analysis of suspended gas pipeline segment. Journal of Pipeline Systems Engineering and Practice. 2017;8(3). DOI: 10.1061/(ASCE)PS.1949-1204.0000261.
[2] Alexandrov A. A., Kotlyarevsky V. A., Larionov V. I., Lisin Y. V. The model of dynamic analysis of seismic effects strength of main pipelines . Electronic scientific journal Oil and Gas Business. 2011;(5):6688. URL: http://ogbus.ru/authors/Aleksandrov/Aleksandrov_1.pdf. (In Russ.)
[3] Roudsari M. T., Samet S., Nuraie N., Sohaei S. Numerically based analysis of buried GRP pipelines under earthquake wave propagation and landslide effects. Periodica Polytechnica Civil Engineering. 2017;61(2):292299. DOI: 10.3311/PPci.9339.
[4] ORourke T. D., Jung J. K., Argyrou C. Underground pipeline response to earthquake-induced ground deformation. Soil Dynamics and Earthquake Engineering. 2016;91:272283. DOI: 10.1016/j.soildyn.2016.09.008.
[5] Denisov G. V., Lalin V. V. Buried pipelines natural oscillations under seismic load. Pipeline Transport: Theory and Practice. 2013;(4):1417. (In Russ.)
[6] Murzakhanov G. K., Ryabtsev S. L. Calculation of pipelines for seismic load with application of finite elements method. Occupational Safety in Industry. 2009;(1):4448. (In Russ.)
[7] LS-DYNA. Keyword users manual. Vol. 1: LS-DYNA R9.0. Livermore Software Technology Corporation, 2016.
[8] Gokhfeld D. A., Chernyavsky O. F., Ilyin A. V. Device for making corrugations on pipe billets: inventors certificate 1333441 USSR. No. 4069165; appl. 1986 July 04; publ. 1987 Aug 30.