NUMERICAL MODELLING OF POWERHOUSE STRUCTURE STRESS-STRAIN STATE CAUSED BY UNEQUAL SETTLEMENT AND DURING ITS LEVELLING OPERATIONS

Cover Page

Abstract


Reinforced concrete elements of the Zagorsk-2 pumped storage station structure had got into unexpected stress-strain state after unequal settlement and bending of the structure crosswise of the flow as a result. Cracks emerged in the load bearing reinforced concrete elements and the reinforcement crossing the cracks suffered significant tensile stresses. Important to mention, that the main reinforcement is arranged along the flow. There was a cofferdam designed and constructed across the reverse channel, which allowed to decreasethe water level and remove water from the channel to provide stabilized position of the powerhouse. After stabilization of the powerhouse, it was planned to level the powerhouse by the compensation grouting method.Based on the finite element soil-structure model of the powerhouse, the stress-strain state of reinforced concrete elements subject to unequal settlement and during the levelling operations was determined.The results of the stress-strain state analysis were compared with the actual in-situ stress data obtained by the “reinforcement de-stressing” method. According to the results of the analysis, it is necessary to strengthen the RC load bearing structures of the Zagorsk-2 powerhouse.In the article, the main design proposals for strengthening the RC load bearing structures of the Zagorsk-2 powerhouseby the external carbon fibre reinforcement are given and justified.


About the authors

Andrey V Aleksandrov

Designing, Surveying and Research Institute “Hydroproject” named after S.Y. Zhuk

Author for correspondence.
Email: a.aleksandrov@hydroproject.ru
2, Volokolamskoe shosse, Moscow, 125080, Russian Federation

engineer, deputy chief engineer for organization of construction and architecture, JSC “Institute Hydroproject”. Research Interests: hydrotechnical construction, restoration of reinforced concrete structures after unpredicted settlements, strenghtening of reinforced concrete structures with composite materials

References

  1. Sandeep S. Pendhari, Tarun Kant, Yogesh M. Desai. Application of polymer composites in civil construction: Ageneral review. Composite Structures. 2008. No. 84. P. 114—124.
  2. Einde L.V.D., Zhao L., Seible F. Use of FRP composites in civil structural application. Constr. Build Mater., No. 17. 2003. P. 389 M.R. 403.
  3. Duell, J.M., Wilson, J.M., Kessler, M.R. Analysis of a carbon composite overwrap pipeline repair system. International Journal of Pressure Vessels and Piping. 2008. No. 85. P. 782—789.
  4. Mohitpour M., Golshan H., Murray A. Pipeline design and construction: a practical approach. ASME Press; New York, 2003. Pp. 499—518.
  5. Chernyavskij V.L. Sistema remonta i usileniya stroitel’nykh konstruktsii [Repair and strengthening of structures]. Hydrotechnika. 2010—2011. No. 4(21)—5(22). P. 60—63. (In Russ.)
  6. Serdyuk A.I., Chernyavskij V.L. Opyt usileniya stroitel’nykh konstruktsii kompozitsionnymi materialami pri rekonstruktsii Baksanskoi GES [Practical experience of strengthening structures of Baksan Hydroelectric Power Station with composite materials during reconstruction]. Hydrotechnika. No. 3(32). 2013. P. 115—117. (In Russ.)
  7. Rubin O.D., Lisichkin S.E., Balagurov V.B., Aleksandrov A.V. Novaya tekhnologiya remonta GTS posredstvom armirovaniya kompozitnymi materialami [New technology of repairing hydraulic structures by strengthening with composite materials]. Proceeding of the VNIIG. Vol. 280. 2016. P. 3—10. (In Russ.)
  8. Lisichkin S.E., Rubin O.D., Shakars I.É., and Novikov S.P. Assessment of the stress-strain state of the left block of the Pļaviņas hydroelectric station powerhouse with consideration of the data of on-site observations. Gidrotekh. Stroit., 1998. No. 2. P. 47—53.
  9. Rubin O.D., Lisichkin S.E., Grebenshchikov V.P., Tsybakov V.A., Nefedov A.V., Katanov A.D., and Ponomarev D.I. Analysis of a reliability assurance solution for the structure of spillway No. 2 of the concrete dam at the Boguchanskaya HPP. Izv. VNIIG. Beton. Zhelezobet. Gidrotekh. Sooruzh., 2005. Vol. 244. P. 227—233.
  10. Rubin O.D., Lisichkin S.E., Lyapin O.B., and Nefedov A.V. Research on concrete and reinforced concrete power-generating structures. Gidrotekh. Stroit., No. 8/9. 22—28 (1999).

Statistics

Views

Abstract - 310

PDF (Russian) - 187

Cited-By


PlumX


Copyright (c) 2018 Aleksandrov A.V.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies