Actual operation of structures: the interaction of structures and the soil base of lattice supports of overhead power lines

Introduction. Modern industrial development of the territories of Siberia and the Far East is carried out primarily due to the intensive construction of main overhead power transmission lines (overhead lines) with a voltage of 220–500 kV. Solving the issue of the actual operation of the structures of supports and foundations is of high relevance to ensure the required reliability of power supply to responsible consumers in severe climatic and transport remote conditions. The movement of foundations in weak soils leads to a significant change in the stress-strain state of the above-foundation structure, creating emergency damage and incidents on overhead lines. However, the modern design of overhead line supports is carried out separately for foundations and above-foundation structures. The object of the study is steel standard lattice overhead line supports of a new unification, and the subject of the study is the interaction of structures, foundation and basement in structures such as lattice overhead line supports.

Materials and methods. A literary review on the interaction of structures, foundations and the ground base of steel overhead line supports aws performed, including an analysis of experimental and theoretical results on this topic, indicating the absence of a unified calculation methodology for the “structures, foundations and ground base” system for overhead line supports based on the use of modern software systems. The results of field tests of overhead line supports with foundations on ground basess, conducted in 1979–1980 with the participation of the author, are presented, indicating significant movements of foundations under loads of the main design modes.

Results. As a result of the calculation of such systems with foundations on a deformable soil base using modern software systems, new results were obtained that differ significantly from those obtained during field tests on a rigid power floor or on fixed foundations.

Conclusions. Performing calculations of structures of supports and foundations in the “construction – foundation – base” system provides a more accurate design of structures for each picket of the route, the so-called individual design, which will significantly reduce the consumption of steel and concrete compared with standard design, as well as increase the reliability of structures of supports and foundations of overhead lines.

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