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In order to study the behavior of reinforced concrete (RC) structures in terms of strength, ductility, even their failure mechanism, the common tool for most researchers is a laboratory test. This method is expensive and quite difficult to implement, therefore, nowadays the researchers turn to Finite Element (FE) Method. Even though this method would obviously be virtual, based on a computer model, it is considered as somewhat reliable and suitable tool for getting the primary data before setting up the full experiments. This becomes a main objective of the study. This study is conducted by taking advantage of FE method to analyze the RC structures named as RC beam, RC beam reinforced with glass fiber sheet (GFRP), and RC beam-column connection. Using commercial FE analysis software, ANSYS, the trial RC beam model was developed, and compared its results with experimental data tested at Burapha University laboratory. The success FE model is comprised of elements SOLID65 as concrete, LINK8 as steel reinforcement and stirrup, SOLID46 as GFRP and steel plate. Based on its geometrical and loading symmetry properties, the quarter FE model of beam was effectively employed. The comparison shows an excellent result for elastic range and acceptable for inelastic range with an error under 20%. The FE model of RC beam from the first part was extended to analyze the RC beams with conventional reinforcing bar, prestressing wire, prestressing stand. Total of 14 FE models of RC beam were simulated with different types and details of steel reinforcement, but keeping the dimension, length, and all material properties the same, except compressive strength. The FE analysis show the incomparable results to experiments considering from flexural loads and displacements at the middle span of the beams. In conclusion, the FE models developed in this study yield in acceptably well results of high loads and deflections. Moreover, the models demonstrate the trends and overall behaviors of RC concrete beams with conventional reinforcing bar, prestressing wire, prestressing stand quite reasonably, especially in the elastic behavior. However, unconfined behavior of concrete after elastic range of concrete needs to be further investigated. |
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