A.N. Vorontsov, Cand. Sci. (Eng.), Lead Specialist, email@example.com V.Yu. Volokhovsky, Cand. Sci. (Eng.), Lead Specialist INTRON PLUS, Ltd., Moscow, Russia
Two approaches to assessment of strength and individual residual resource of guy lines steel ropes of antenna mast structures with the use of data of the operative diagnostics by the method of Hall effect are considered. The principles of strength assessment of the ropes with defects in the presence of two diagnostic indicators are stated (the distributed loss of the bearing rope section on metal due to corrosion and local breaks of wires). As mechanical model the structural theory of steel ropes is used, which describes their design as the system with two generalized degrees of freedom (linear axial deformation, and the twist angle in relation to the longitudinal axis). Dependence of strength on the picture of wear is analyzed by means of statistical modeling of defects location in each section of the rope after processing of the received defectograms. Individual residual resource is defined by the change history of the current margin of safety (bearing capacity) of the guy lines in relation to maximum permissible minimum margin of safety (survivability) of partially worn-out structure. The example of calculation is given concerning the individual residual resource of fiveguy lines of the retransmitting mast according to the data of three inspections with a year interval. For the most intense rope it is shown that the strength calculation gives the conservative estimates of the resource, which will be referred to reliability margin. On the basis of the received results the recommendations are formulated on the contents of the conclusion about technical condition of the controlled guy lines and the actions of service personnel concerning further operation.
1. Bolotin V.V. Prognozirovanie resursa mashin i konstrukcij (Forecast of the Resource of Machines and Structures). Moscow: Mashinostroenie, 1984. 312 p.
2. Sukhorukov V., Slesarev D., Vorontsov A. Electromagnetic inspection and diagnostics of steel ropes: technology, effectiveness and problems. Materials Evaluation. 2014. Vol. 72. № 8. pp. 1019–1027.
3. SP 16.13330.2011. Stalnye konstrukcii. Aktualizirovannaja redakcija SNiP II-23—81* (SP 16.13330.2011. Steel Structures. Updated Edition of SNiP II-23—81*). Moscow: Minregiona Rossii, 2011. 178 p.
4. Glushko M.F. Stalnye podemnye kanaty (Steel Hoisting Ropes). Kiev: Tehnika, 1966. 328 p.
5. Malinovskij V.A. Stalnye kanaty (Steel Ropes). V 2 parts. Odessa: Astroprint, 2001. Pt. 1. 188 p.
6. Teissier J.M., Ridge I.M.L., Evans J.J., Fournier M. The effect of wire break distribution on the breaking strength if a wire rope. OIPEEC Conference. La Rochelle, 2017. pp. 267–293.
7. RD ROJeSK 012—97. Kanaty stalnye. Kontrol i normy brakovki (RD ROESK 012 — 97. Steel Ropes. Control and Norms of Rejection). Moscow: ROJeSK, 1997. 49 p.
8. Kashyap S., Laxminarayna G., Tewathri S., Sinha A. Non-destructive testing of steel wire ropes and their discard criteria. The 8th International Conference on Non-Destructive Testing in Engineering. Portoroz, 2005. pp. 229–235.
9. Weischedel H.R. Wire Rope Roughness (WRR), a new indicator for the quantitative characterization of wire rope deterioration. OIPEEC Conference. Oxford, 2013. pp. 55–76.
10. Vorontsov A., Volokhovsky V., Slesarev D. Combined approach to damaged wire ropes life-time assessment based on NDT results and rope mechanics. Journal of Physics: Conference Series. 2011. Vol. 35. 9 p.
11. Vorontsov A., Volokhovsky V., Halonen J., Sunio J. Prediction of operating time of steel wire ropes using magnetic NDT data. OIPEEC Conference. Johannesburg, 2007. pp. 145–154.
12. GOST 7669—80. Kanaty stalnye. Sortament (GOST 7669 — 80. Steel Ropes. Assortment). Moscow: Izd-vo standartov, 1996. 192 c.