Modelling cracking in reinforced-concrete beams using beam finite elements with embedded discontinuity

2014 ◽  
pp. 569-578
Author(s):  
P Šćulac ◽  
G Jelenić
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Elements With Embedded Discontinuity

Modelling and Analysis of Reinforced Concrete Beams

2015 ◽  
Vol 662 ◽  
pp. 81-84 ◽  
Author(s):  
Oldrich Sucharda ◽  
Jan Kubosek
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Concrete Beams ◽  
Load Capacity ◽  
Linear Analysis ◽  
Reinforced Concrete Beams ◽  
Total Load ◽  
Concrete Properties ◽  
Non Linear ◽  
Standard Tests

The goal of the paper is to model and evaluate the total load capacity of the reinforced concrete beams. A non-linear analysis and finite element method were used for that purpose. The model consists of 3D finite elements. The constitutive model of concrete for the non-linear analysis is based on a fracture-plastic theory. The input parameters are the data obtained in previous tests which included both standard tests and additional tests of the testing bodies. There is no shear reinforcement in the beams. The non-linear calculations were carried out for several variants. The study takes into considerations the influence of concrete properties as well as the size of the finite elements.

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.

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