Published since 1923
DOI: 10.33622/0869-7019
Russian Science Citation Index (RSCI) на платформе Web of Science
  • BUILDING STRUCTURES, BUILDINGS AND FACILITIES
  • Stresses In Tendons Of Post-Tensioned Concrete Structures At Ultimate Limit State
  • UDC 624.012.46 DOI: 10.33622/0869-7019.2020.03.10-16
    Evgeniy A. CHISTYAKOV, e-mail: lab01@mail.ru
    Sergey B. KRYLOV, e-mail: niizhb_lab8@mail.ru
    Ravil Sh. SHARIPOV, e-mail: wander-er1@yandex.ru
    JSC Research Center of Construction, NIIZHB named after A. A. Gvozdev, 2-ya Institutskaya ul., 6, korp. 5, Moscow 109428, Russian Federation
    Abstract. Currently post-tensioned concrete structures, which are designed with bonded or unbonded tendons, are widely used in construction. The features of calculation of post-tensioned structures with unbonded tendons, which are contained in some other design codes, are considered. It is noted that the current design code for plain and reinforced concrete structures include the provisions for the calculation of post-tensioned concrete structures with bonded tendons. However, there are no recommendations for the calculation of post-tensioned concrete structures with unbonded tendons, taking into account the specific features of the stress-strain state of structures with such prestressing tendons. These features significantly affect both the ultimate moment resistance of structures and their deformations, usually in the unfavorable direction in comparison with structures in which the bonded tendons are accepted. Therefore, the main attention when developing a method for calculating of post-tensioned concrete structures with unbonded tendons was paid to determining the stresses in such reinforcement at the ultimate limit state capacity check. As a result, a method for determining the stresses and increase of the stress from the external load in the unbonded tendons was developed for calculating the ultimate moment resistance of structures. The proposed method presented in the article showed a close correspondence with the data obtained from other studies, in which the stresses in the unbonded tendons were determined by the results of experimental and theoretical studies.
    Key words: post-tensioned concrete structures, bonded and unbonded tendons, stress in tendons, increase of stress in tendons, ultimate moment resistance, depth of the compression zone of concrete.
  • REFERENCES
    1. Integrated solutions for building prestressing by post-tensioning [Комплексные решения для создания предварительного напряжения путем постнапряжения]. Freyssinet Report CIII 2, 2012. 16 р.
    2. Zenin S. A., Sharipov R. Sh., Kudinov O. V. Development of modern reinforced concrete post-stressed structures in the aspect of the required regulatory and technical design framework. Tekhnologii betonov, 2016, no. 7-8, pp. 30-32. (In Russian).
    3. Post-tensioning in buildings. FIB Technical Report [Постнапряжение в зданиях. Технический отчет ФИБ]. Bulletin, 2005, no. 31. 118 р.
    4. Dywidag-systems international. Post-tensioning kit for prestressing of structures with unbonded monostrands for concrete (1 to 5 monostrands) [Комплект постнапряжения для предварительного напряжения конструкций с канатной арматурой без сцепления с бетоном (1-5 канатов)], 2009. 40 р.
    5. Post-tensioned concrete floors: Design handbook. Concrete Society Technical Report no. 43 [Постнапряженные железобетонные плиты перекрытий: Руководство для проектирования]. Published by The Concrete Society, Camberley, UK, 2005. 112 p.
    6. Chistyakov E. A., Zenin S. A., Sharipov R. Sh., Kudinov O. V. Reinforcement of monolithic post-stressed reinforced concrete structures performed without coupling of reinforcement with concrete.Stroitel'nye materialy, 2018, no. 5, pp. 32-37. (In Russian).
    7. Metodicheskoe posobie "Konstruktsii zhelezobetonnye monolitnye s napryagaemoy armaturoy bez stsepleniya s betonom. Pravila proektirovaniya" [Methodical manual "Design of monolithic reinforced concrete, with stressed reinforcement, without adhesion to the concrete. Design rules"]. Moscow, FAU FTsS Minstroya Rossii Publ., 2017, 109 p. (In Russian).
    8. Krylov S. B., Bolgov A. N., Zenin S. A., Terin V. D., Sharipov R. Sh. On the question of interaction of the Code of rules SP 63.13330 "SNiP 52-01-2003. Plain and reinforced concrete structures. General provisions" with developing "guides". Promyshlennoe i grazhdanskoe stroitel'stvo, 2018, no. 9, pp. 79-85. (In Russian).
    9. Sharipov R. Sh., Zenin S. A., Kudinov O. V. Problems of calculating prestressed reinforced concrete structures without coupling reinforcement with concrete for the first and second groups of limit states and ways to solve them. Academia. Arkhitektura i stroitel'stvo, 2017, no. 1, pp. 129-132. (In Russian).
    10. Zenin S. A., Sharipov R. Sh., Kudinov O. V., Semenov V. A. Static calculation of elements of structural systems with post-stressed floors without coupling of reinforcement with concrete. Stroitel'naya mekhanika i raschet sooruzheniy, 2017, no. 4(273), pp. 11-16. (In Russian).
    11. EN 1992-1-1. Eurocode 2: Design of concrete structures. Part 1 - 1, General rules and rules for buildings [Проектирование конструкций из бетона. Ч. 1-1. Основные правила и правила для зданий].
    12. ACI 318. Building code requirements for structural concrete [Требования строительных норм для бетонных и железобетонных конструкций]. American Concrete Institute, Farmington Hills, USA, 2011.
    13. Pannel F. N. The ultimate moment of resistance of unbonded prestressed concrete beams [Несущая способность предварительно напряженных железобетонных балок с арматурой без сцепления с бетоном]. Magazine of Concrete Research, 1969, vol. 21. no. 66, pp. 43-54.
    14. Pannel F. N., Tam A. The ultimate moment of resistance of unbonded partially prestressed reinforced concrete beams [Несущая способность смешанно армированных железобетонных балок с преднапряженной арматурой без сцепления с бетоном]. Magazine of Concrete Research, 1976, vol. 28, no. 97, pp. 203-208.
    15. Novoe v proektirovanii betonnykh i zhelezobetonnykh konstruktsiy [New in the design of concrete and reinforced concrete structures] / pod red. A. A. Gvozdeva. Moscow, Stroyizdat Publ., 1978. 204 p. (In Russian).
  • For citation: Chistyakov E. A., Krylov S. B., Sharipov R. Sh. Stresses in Tendons of Post-Tensioned Concrete Structures at Ultimate Limit State. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering], 2020, no. 3, pp. 10-16. (In Russian). DOI: 10.33622/0869-7019.2020.03.10-16.


BACK