Numerical Analysis of Ductility in Reinforced Concrete Beams in the CASTEM 2000

2009 ◽  
Author(s):  
M.P. Barbosa ◽  
A.L. Gamino
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Concrete Beams ◽  
Reinforced Concrete Beams

scholarly journals The numerical analysis of the long-term behaviour of the reinforced concrete beams strengthened with carbon fiber reinforced polymer: Deflection

2019 ◽  
Author(s):  
Mykolas Daugevičius ◽  
Juozas Valivonis ◽  
Tomas Skuturna
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Finite Elements ◽  
Numerical Modelling ◽  
External Load ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Steady Increase ◽  
Strengthening Effect

The numerical analysis of the reinforced concrete beams strengthened with CFRP is presented. The beams previously tested experimentally under long-term loading are selected for numerical simulation. The numerical modelling is performed by evaluating the beam’s work at various stages: the work stage before the long-term loading period, the work stage under the long-term load action, the work stage when the external load is removed and the work stage until failure. The work stages of all modelled beams are described in more detail. To analyse the behaviour of beams at different work stages, the numerical modelling using the phase analysis is performed. Different finite element groups are evaluated in each phase of analysis. The external load is increased, maintained and reduced. The finite elements of the CFRP layer are activated at a certain work stage for evaluating the strengthening effect. To assess the accuracy of the numerical analysis, each beam is modelled from the finite elements of various sizes. The paper presents the process of the numerical modelling and the predicted deflections. The numerically predicted deflections are compared with the deflections of the experimental study. The modelling of the behaviour of the strengthened beams has shown that the nature of the long-term deflection differs from that obtained in the experiment. The increment of the numerically predicted deflection decreases gradually over the long-term period. Meanwhile, the experimental long-term deflection increment is characterised by the sharp increase and decrease at the start of the long-term period. This contradiction shows that the experimental long-term deflections are greater. However, over time, the numerical model deflections may reach and exceed the experimental deflections due to steady increase. The smaller size of the finite elements causes the increase in the cracking moment and the higher moment when the yielding of the tensioned reinforcement occurs. However, the cracking moment obtained by the numerical modelling is much higher than that obtained by the experimental modelling. However, when the yielding strength of the tensile reinforcement is reached, the considered moment is smaller than the experimental one.

scholarly journals The efficiency of using CFRP as a strengthening technique for reinforced concrete beams subjected to blast loading

2019 ◽  
Vol 11 (4) ◽  
pp. 411-420 ◽  
Author(s):  
Ali Jahami ◽  
Yehya Temsah ◽  
Jamal Khatib
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Carbon Fiber ◽  
Concrete Beams ◽  
Blast Loading ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer

Abstract Some structures may be subjected to blast loading while in service. This may cause damage or failure to the structural elements. This paper examines the performance of reinforced concrete beams using carbon fiber reinforced polymer (CFRP) when subjected to blast loading. The experimental data including damage and deflection were collected from a previous investigation and numerical analysis was then performed using ABAQUS software. Furthermore, the single degree of freedom (SDOF) model was used to complement the findings from numerical analysis. Following the good correlation between the experimental and numerical data, further analysis was performed on reinforced concrete beams strengthened with carbon fiber-reinforced polymer (CFRP). Using CFRP was found to enhance the load capacity and energy absorption and to reduce the central deflection. In addition, Iso-Damage curves were produced for each beam, thus allowing the assessment of damage to be predicted.

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