Abstract:Abstract:External bonding of fiber reinforced plastic (FRP) strips to reinforced concrete (RC) beams has been widely accepted as an effective method for strengthening and rehabilitation of aging civil structures. The FRP strips improve significantly the ultimate flexural strength of RC beams. This paper reports the effectiveness of taper end FRP design in further enhancing the structural performance of strengthened RC beams. The relative performance of taper distance was specifically evaluated in an effort to … Show more
The article presents the analysis of the cracking moment and the strength of beams reinforced with external carbon fibre. Experimental research of beams strengthened in this way has been carried out. Three different methods of anchoring external reinforcement were applied to strengthen the beams. The influence of anchorage on the cracking moment and the strength of the beams has been defined. Design methods for defining the cracking moment and the strength have been presented. The design procedure for defining the cracking moment evaluates the curvilinear stress diagrams of concrete under tension and compression. The design procedure for defining the strength of the structures evaluates the stiffness of the contact between the carbon fibre and the concrete. The design results are provided. Comparative analysis of the experimental and the theoretical results has been performed.
The article presents the analysis of the cracking moment and the strength of beams reinforced with external carbon fibre. Experimental research of beams strengthened in this way has been carried out. Three different methods of anchoring external reinforcement were applied to strengthen the beams. The influence of anchorage on the cracking moment and the strength of the beams has been defined. Design methods for defining the cracking moment and the strength have been presented. The design procedure for defining the cracking moment evaluates the curvilinear stress diagrams of concrete under tension and compression. The design procedure for defining the strength of the structures evaluates the stiffness of the contact between the carbon fibre and the concrete. The design results are provided. Comparative analysis of the experimental and the theoretical results has been performed.
“… Figure A6 Gao et al, 2004 [ 29 ] research beams deflection compared with calculated, ( a ) beam CON1; ( b ) beam A0; ( c ) beam A10; ( d ) beam A20; ( e ) beam B0; ( f ) beam B10; ( g ) beam B20; ( h ) scatter of the results at 60% and 80% of the ultimate load. Figure A7 Gao et al, 2006 [ 30 ] research beams displacement compared with calculated deflection, ( a ) beam 2O; ( b ) beam 2N4; ( c ) beam 2N6; ( d ) beam 2T450-1; ( e ) beam 2T625-1; ( f ) beam 2T650-1; ( g ) beam 2T675-1; ( h ) beam 2T4100-1; ( i ) scatter of the results at 60 % and 80% of the ultimate load. Figure A8 Heffernan 1997 [ 31 ] research beams displacement compared with calculated deflection, ( a ) beam Conventional; ( b ) beam CFRP Strengthened; ( c ) scatter of the results at 60% and 80% of the ultimate load.…”
Section: Figure A1mentioning
confidence: 99%
“… Gao et al, 2006 [ 30 ] research beams displacement compared with calculated deflection, ( a ) beam 2O; ( b ) beam 2N4; ( c ) beam 2N6; ( d ) beam 2T450-1; ( e ) beam 2T625-1; ( f ) beam 2T650-1; ( g ) beam 2T675-1; ( h ) beam 2T4100-1; ( i ) scatter of the results at 60 % and 80% of the ultimate load. …”
The article analyses the calculation of the deflection of reinforced concrete beams strengthened with fiber reinforced polymer. This paper specifically focuses on estimating deflection when the yielding of reinforcement is reached. The article proposes a simple method for calculating deflection that was compared with the experimentally predicted deflection. The carried out comparison has showed that the proposed method is suitable not only for the strengthened beams but also for the reinforced concrete beams with a varying reinforcement ratio. The suggested calculation method is based on the effective moment of inertia, such as the one introduced in the ACI Committee 318 Building Code Requirement for Structural Concrete (ACI318). The development of deflection was divided into three stages, and equations for the effective moment of inertia were proposed considering separate stages. In addition, the put forward equations were modified attaching additional relative coefficients evaluating a change in the depth of the neutral axis.
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