Wzmacnianie konstrukcji żelbetowych wstępnie naprężonymi materiałami kompozytowymi FRP

• Autorzy: Meier U. , Kotynia R.

Warianty tytułu

EN

Strengthening of reinforced concrete structures with prestressed CFRP strips

• Konferencja: II Konferencja Naukowo-Techniczna na temat "Materiały kompozytowe w budownictwie mostowym"
• Języki publikacji: PL

Abstrakty

EN

Debonding of the CFRP extemal reinforcement and concrete cover delamination is the most common mode of failure observed in the experimental tests. These premature failure significantly limit the efficiency of the CFRP strips. Application of prestressed FRP strips on the tension face of concrete members control the cracks distribution, limit deflection of the concrete elements and increase the ultimate strength of the strengthened specimens by preventing premature debonding failure. The paper presents several prestressing and anchorage systems that required special end anchorage systems. A new technology of anchorage with gradually reduced prestressing force was developed and successfully tested in the Swiss Federal Laboratories for Materials Research (EMPA) in Duebendorf-Zurich. This method allows variation of the prestressing levels in the CFRP strip, eliminating the risk of shearing-orf in the concrete. The paper presents state of the art of the experimental tests in the field of strengthening RC members with initially prestressed strips.

Słowa kluczowe

PL

taśmy polimerowe; wzmacnianie konstrukcji żelbetowych

EN

FRP strips

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Zeszyty Naukowe. Budownictwo / Politechnika Łódzka
• Rocznik: 2006
• Tom: Z. 55
• Strony: 82--90
• Opis fizyczny: . Bibliogr, 15 poz.

Twórcy

autor

Meier U.

autor

Kotynia R.

• EMPA, Duebendorf Switzerland

Bibliografia

• [1] Meier U., Deuring M., Meier H., Schwegler G.: Strengthening of Structures with CFRP Larninates: Research and Aplications in Switzerland. Proc. of the 1st Int. Conf. on Advanced Composite Materials in Bridge Structures, CSCE, Sherbrooke, Quebek, Canada 1992, pp. 243-251.
• [2] Stoecklin I., Meier U.: Strengthening of Concrete Structures with Prestressed and Gradually Anchored CFRP Strips, Proceedings of the 6th Int. Symp. on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures (FRPRCS-6), Singapore 2003, pp. 1321-1330.
• [3] Andrae H. P., Maier M., Peters H., Gusia P.J.: A New Approach of bonded anchorages for CFRP Prestressing Tendons and Cables. Proc. of the Int. Symp. On Bond Behaviour of FRP in Structures, Hong Kong 2005, pp. 337-344.
• [4] S&P Reinforcement Sp. z 0.0., Materiały informacyjne, karty techniczne.
• [5] Łagoda M.: Wzmacnianie mostów przez doklejanie elementów. Wydawnictwo Politechniki Krakowskiej, Kraków 2005.
• [6] Sika@CarboDur@ CFRP , Structural Strengthening with Prestressed Sika@CarboDur@ CFRP Plate -materiały informacyjne.
• [7] Deuring M.: Verst'J.rken Von Stahlbeton mit gespannten Faserverbundwekstoffen. Bericht No 224, EMPA Duebendorf, 1993.
• [8] Meier U., Deuring M., Meier H., Schwegler G.: Strengthening of Concrete with Advanced Composite. Altemative Materials for the Reinforced and Prestressing of Concrete, Clarke J.L., Blackie Acadernic & Professional, London 1993, pp. 153-171.
• [9] Meier U.: Strengthening of Structures Using Carbon Fibre/Epoxy Composites. Construction and Building Materials, V. 9, No 6,1995, pp. 341-351.
• [10] Trintafillou T. C., Deskovic N., Deuring M.: Strengthening of Concrete Structures with Prestressed Fiber Reinforced Sheets". ACI Structural Journal, V. 89, No 3, May-June 1992, pp. 235-244.
• [11] Trintafillou T. C., Deskovic N.: Innovative Prestressing with FRP Sheets: Mechanics of Short-Term Behaviour. Journal of Engineering Mechanics, ASCE, V. 117, No 7,1991, pp. 1652-1672.
• [12] Quantrill R.J., Hollaway L.C.: The Flexural Rehabilitation of Reinforced Concrete Beams by the use of Prestressed Advanced Composite Plates. Composites, Science and Technology, pp. 1259-1275.
• [13] Wu Z., Matsuzaki T., Yokoyama K., Kanda T.: Retrofitting Method for Reinforced Concrete Structures with Extemally Prestressed Carbon Fiber Sheets. Proc. of the 4th Int. Symp. On Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, Baltimore, Maryland, USA, 1999, pp. 751-765.
• [14] EL-Hacha R., Gordon W., Green M.F .: Innovative System for Prestressing Fiber-Reinforced Polymer Sheets. ACI Structural Journal, V. 100, No 3, 2003, pp. 305-313.
• [15] Kotynia R., Stoecklin I., Meier U.: Analysis of Prestressed and Gradually Anchored CFRP Strips for Strengthening Concrete Structures. the 5th lnt. Conference Analytical Models and New Concepts in Concrete and Masonry Structures, Gliwice-Ustroń 2005, CD.