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A platform for research: civil engineering, architecture and urbanism
Prestressed carbon fiber reinforced polymer sheets for strengthening concrete beams at room and low temperatures
A technique for strengthening damaged concrete beams using prestressed carbon fiber reinforced polymer (CFRP) sheets was developed at Queen's University and the Royal Military College of Canada. As part of this study, an anchorage system was developed to directly prestress the CFRP sheets by jacking and reacting against the strengthened concrete beam itself. The feasibility and effectiveness of using bonded prestressed CFRP sheets to strengthen precracked concrete beams at both room (+22 deg C, +72 deg F) and low (-28 deg C, -20deg F) temperatures have been investigated exerimentally. Materials and prestress changes due to temperature variations that would affect and cause changes in flexural behavior were studied. The strengthened beams showed significant increases in flexural stiffness and ultimate capacity as compared to the control-unstrengthened beams. The flexural behavior of the strengthened beams was not adversely affected by short-term exposure to reduced temperature (-28 deg C, -20 deg F). In addition to the experimental investigation, analytical models were developed to predict the overall flexural behavior of the strengthened beams during prestressing of the CFRP sheets and under external loading at both room and low temperatures. The model accurately predicted the flexural beam behavior. Improved serviceability behavior and higher strength were predicted for beams strengthened with the bonded prestressed CFRP sheets.
Prestressed carbon fiber reinforced polymer sheets for strengthening concrete beams at room and low temperatures
A technique for strengthening damaged concrete beams using prestressed carbon fiber reinforced polymer (CFRP) sheets was developed at Queen's University and the Royal Military College of Canada. As part of this study, an anchorage system was developed to directly prestress the CFRP sheets by jacking and reacting against the strengthened concrete beam itself. The feasibility and effectiveness of using bonded prestressed CFRP sheets to strengthen precracked concrete beams at both room (+22 deg C, +72 deg F) and low (-28 deg C, -20deg F) temperatures have been investigated exerimentally. Materials and prestress changes due to temperature variations that would affect and cause changes in flexural behavior were studied. The strengthened beams showed significant increases in flexural stiffness and ultimate capacity as compared to the control-unstrengthened beams. The flexural behavior of the strengthened beams was not adversely affected by short-term exposure to reduced temperature (-28 deg C, -20 deg F). In addition to the experimental investigation, analytical models were developed to predict the overall flexural behavior of the strengthened beams during prestressing of the CFRP sheets and under external loading at both room and low temperatures. The model accurately predicted the flexural beam behavior. Improved serviceability behavior and higher strength were predicted for beams strengthened with the bonded prestressed CFRP sheets.
Prestressed carbon fiber reinforced polymer sheets for strengthening concrete beams at room and low temperatures
Vorgespannte, carbonfaserverstärkte Kunststoffplatten für die Verstärkung von Betonträgern bei Raum- und Niedertemperatur
El-Hacha, Raafat (author) / Wight, R. Gordon (author) / Green, Mark F. (author)
Journal of Composites for Construction ; 8 ; 3-13
2004
11 Seiten, 8 Bilder, 4 Tabellen, 31 Quellen
Article (Journal)
English
T-Träger , Stahlbeton , Verstärkung (Festigkeit) , carbonfaserverstärkter Kunststoff , Platte (Bauteil) , vorgespanntes Baumaterial , Vorspannung (mechanisch) , Verankerung (mechanische Befestigung) , Niedertemperatur , Retrofitting , Temperatureinfluss , Umhüllung , Biegesteifigkeit , Tragfähigkeit , Reparatur , Klebverbindung
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Strengthening Reinforced Concrete Beams by Using Prestressed Fiber Sheets
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