Flexural Behavior and Energy Absorption of Carbon FRP Reinforced Concrete Beams


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Title: Flexural Behavior and Energy Absorption of Carbon FRP Reinforced Concrete Beams

Author(s): Tadahiro Kakizawa, Sadatoshi Ohno, and Toshio Yonezawa

Publication: Special Publication

Volume: 138


Appears on pages(s): 585-598

Keywords: absorption; beams (supports); cable; carbon; deformation; cracking (fracturing); ductility; failure; fiber reinforced plastics; flexural strength; prestressed concrete; reinforced concrete; Structural Research

Date: 9/1/1993

Research and development of FRP bars and cables for reinforcement of concrete structures has recently been carried out. The basic behavior of concrete members reinforced with these FRP bars has become clear. However, there are still debatable points in terms of design concept, such as the recommended failure mode or required toughness and ductility. The authors carried out loading tests of 16 concrete beams reinforced with carbon FRP bars and cables to discuss both the serviceability and ultimate limit states. The specimens included RC, PC, and PPC members. The main factors were bond properties of the FRP reinforcement and prestress force. The experimental results show that cracking and deformation behavior vary with the prestress force and bond property of FRP bars, and that the reasonable serviceability condition will be achieved by controlling these factors. Also, failure mode was affected by these factors and the reinforcing systems, despite the fact that these specimens have almost the same reinforcement ratio. In relation to the failure mode, the energy absorption, which is defined as the area enclosed by the load-deflection curve, was measured to determine toughness and ductility in the ultimate limit state. The authors recommend that the design take into account the toughness based on energy absorbed before the maximum load.