Abstract
There are several techniques to simulate rebar reinforced concrete, such as smeared model, discrete model, embedded model, CLIS (constrained Lagrange in solid) model, and CBIS (constrained beam in solid) model. In this study, however, the interaction between the concrete elements and the reinforcement beam elements is only simulated by the discrete model and CBIS (constrained beam in solid) model. The efficiency and accuracy comparisons are investigated with reference to the analysis results by both models provided by LS-DYNA explicit finite element software. The geometric models are created using LS-PrePost, general purpose preprocessing software for meshing. The meshed models are imported to LS-DYNA where the input files are then analyzed. Winfrith and CSCM concrete material options are employed to describe the concrete damage behavior. The reinforcement material model is capable of isotropic and kinematic hardening plasticity. The load versus midspan deflection curves of the finite element models correlate with those of the experiment. Under the conditions of the same level of accuracy, the CBIS model is evaluated to have the following advantages over the discrete model. First, it has the advantage of reducing the time required for FE modeling; second, saving computer CPU time due to a reduction in total number of nodes; and third, securing a good aspect ratio of concrete elements.
Highlights
Finite element method is one of the most accurate and effective techniques for analyzing complicated structural engineering problems like reinforced concrete, which provides a convenient and adaptable tool for covering the problems associated with the analysis of the reinforced concrete
On the other hand, reinforcing steels in concrete are idealized using one-dimensional beam elements [13, 14]. ere are several ways to model a beam in which reinforcement is placed in concrete. e first approach is the distributed or smeared representation, in which the reinforcement is assumed to be distributed over the concrete element in the appropriate direction. is is a method of substituting a layer having an equivalent thickness as much as the number of reinforcing bars arranged. is method is the simplest method, but it has limitations in expressing local failure patterns such as cracks in the concrete area around the rebar. e second approach is a discrete model
In the linear elastic stage, the stiffness of the load-displacement curve by VecTor4 is similar to the experimental result as well as the analysis results obtained by the constrained beam in solid (CBIS) model using the CSCM model and the Winfrith concrete model
Summary
Finite Element Analysis of RC Beams by the Discrete Model and CBIS Model Using LS-DYNA. E efficiency and accuracy comparisons are investigated with reference to the analysis results by both models provided by LS-DYNA explicit finite element software. Under the conditions of the same level of accuracy, the CBIS model is evaluated to have the following advantages over the discrete model. It has the advantage of reducing the time required for FE modeling; second, saving computer CPU time due to a reduction in total number of nodes; and third, securing a good aspect ratio of concrete elements
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