AbstractAbout AuthorsReferences
The description of the adopted technical solutions of prestressing tendons for post-tensioned members is presented. Post-tensioned members in which the prestressing steel has not bond with concrete are considered. Issues of unbonded tendons of such members as well as instructions for design of cast in-situ structures of normal weight concrete with post-tensioning of tendons under the construction conditions are outlined in details in the new methodical manual “Reinforced cast in-situ post-tensioned concrete structures with unbonded tendons. Design Rules”. One of the important sections of the manual described in this article is the section about prestressing steel used in post-tensioned concrete structures. These tendons for post-tensioned members (without bond with concrete) are conducted with special prestressing elements which include high-strength steel strands coated with the closed flexible plastic sheaths. Sheaths contain a protective grease. As a rule, strands of the highest level of quality (low relaxation steel strands) made of round smooth wire (K7) and compacted strands made of round smooth wire (K7O) are used. The existing technical solutions of anchorages and couplers for such prestressing elements are also considered.
E.A. CHISTYAKOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
S.A. ZENIN, Candidate of Sciences (Engineering)
R.Sh. SHARIPOV (This email address is being protected from spambots. You need JavaScript enabled to view it.), Candidate of Sciences (Engineering)
O.V. KUDINOV, Engineer
S.A. ZENIN, Candidate of Sciences (Engineering)
R.Sh. SHARIPOV (This email address is being protected from spambots. You need JavaScript enabled to view it.), Candidate of Sciences (Engineering)
O.V. KUDINOV, Engineer
Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev (NIIZHB), JSC “Research Center of Construction” (6, 2nd Institutskaya Street, 109428, Moscow, Russian Federation)
1. Methodical Manual “Post-tensioned concrete structures with unbonded tendons. Design rules». Moscow: FAU FTsS Minstroya Rossii, 2017. 108 p. https://www.faufcc. ru/upload/methodical_materials/mp53_2017.pdf
2. Sharipov R.Sh., Zenin S.A., Kudinov O.V. Problems of analysis of post-tensioned concrete structures with unbonded tendons of the first and second groups of limit states and solutions. Academia. Arkhitektura i stroitel’stvo. 2017. No. 1, рр. 129–132. (In Russian).
3. Zenin S.A., Sharipov R.Sh., Kudinov O.V., Semyonov V.A. Static analysis of members of structural systems with post-tensioned concrete floors having unbonded tendons. Stroitel’naya mekhanika i raschet sooruzhenii. 2017. No. 4 (273), pp. 11–16. (In Russian).
4. Matar P.Yu., Barkaya T.R., Brovkin A.V., Demidov A.V. Losses of prestressing in post-tensioned reinforced concrete structures without adhesion of reinforcement to concrete. Beton i zhelezobeton. 2015. No. 6, pp. 10–15. (In Russian).
5. Kishinevskaya E.V., Vatin N.I., Kuznetsov V.D. Strengthening of building structures using post-tensioned reinforced concrete. Inzhenerno-stroitel’nyy zhurnal. 2009. No. 3, pp. 29–32. (In Russian).
6. Polikarpov D.E. Pre-stressed reinforced concrete structures with reinforcement tension on concrete. Regional building complex: problems and development prospects in modern conditions Collection of materials of the regional scientific and practical conference. East European Institute, Research Institute “Construction Laboratory”, Union of Builders of the Udmurt Republic. 2016. pp. 91–95. (In Russian).
7. ACI 423.7-07. Specification for unbounded single-strand tendon. American Concrete Institute. Farmington Hills. USA. 2008.
8. Integrated solutions for building prestressing by posttensioning. Freyssinet Report CIII 2, 2012.
9. Dywidag-Systems International. Post-Tensioning Kit for Prestressing of Structures with Unbonded Monostrands for Concrete (1 to 5 Monostrands), 2009.
10. European committee for standardization. EN 1992-1-1. Eurocode 2: Design of concrete structures. Part 1-1. General rules and rules for buildings.
11. ACI 423.3R-05. Recommendations for concrete members prestressed with unbonded tendons. American Concrete Institute. Farmington Hills. USA. 2005.
2. Sharipov R.Sh., Zenin S.A., Kudinov O.V. Problems of analysis of post-tensioned concrete structures with unbonded tendons of the first and second groups of limit states and solutions. Academia. Arkhitektura i stroitel’stvo. 2017. No. 1, рр. 129–132. (In Russian).
3. Zenin S.A., Sharipov R.Sh., Kudinov O.V., Semyonov V.A. Static analysis of members of structural systems with post-tensioned concrete floors having unbonded tendons. Stroitel’naya mekhanika i raschet sooruzhenii. 2017. No. 4 (273), pp. 11–16. (In Russian).
4. Matar P.Yu., Barkaya T.R., Brovkin A.V., Demidov A.V. Losses of prestressing in post-tensioned reinforced concrete structures without adhesion of reinforcement to concrete. Beton i zhelezobeton. 2015. No. 6, pp. 10–15. (In Russian).
5. Kishinevskaya E.V., Vatin N.I., Kuznetsov V.D. Strengthening of building structures using post-tensioned reinforced concrete. Inzhenerno-stroitel’nyy zhurnal. 2009. No. 3, pp. 29–32. (In Russian).
6. Polikarpov D.E. Pre-stressed reinforced concrete structures with reinforcement tension on concrete. Regional building complex: problems and development prospects in modern conditions Collection of materials of the regional scientific and practical conference. East European Institute, Research Institute “Construction Laboratory”, Union of Builders of the Udmurt Republic. 2016. pp. 91–95. (In Russian).
7. ACI 423.7-07. Specification for unbounded single-strand tendon. American Concrete Institute. Farmington Hills. USA. 2008.
8. Integrated solutions for building prestressing by posttensioning. Freyssinet Report CIII 2, 2012.
9. Dywidag-Systems International. Post-Tensioning Kit for Prestressing of Structures with Unbonded Monostrands for Concrete (1 to 5 Monostrands), 2009.
10. European committee for standardization. EN 1992-1-1. Eurocode 2: Design of concrete structures. Part 1-1. General rules and rules for buildings.
11. ACI 423.3R-05. Recommendations for concrete members prestressed with unbonded tendons. American Concrete Institute. Farmington Hills. USA. 2005.
For citation: Chistyakov E.A., Zenin S.A., Sharipov R.Sh., Kudinov O.V. Prestressing unbonded tendons for cast in-situ post-tensioned reinforced concrete members. Stroitel’nye Materialy [Construction Materials]. 2018. No. 5, pp. 32–37. DOI: https://doi.org/10.31659/0585-430X-2018-759-5-32-37 (In Russian).