Prediksi Perilaku Struktural pada Reinforced Concrete Dapped-End Beams (Rc-Debs) Berbasis Finite Element Modeling (Fem)

Abstract

Over the past few decades, the use of precast concrete structures has increased in the construction industry. The advantages of precast structures include controllable quality, simple installation, speed of construction, etc. For the purposes of stability of the mount between the precast girder (beam) and the support, a modification is required at the end of the precast girder (beam), namely by recessing (sliding) at both ends, which is known as a dapped-end beam. Dapped-end beams are often used in the construction of bridges, warehouses, factories, buildings, parking structures, etc. The presence of these notches results in discontinuities, namely disruption of the flow of stress in the support area. This condition can cause stress concentrations, which of course can cause cracks, damage or collapse in the dapped-end area. To overcome this technical problem, further studies are needed on dapped-end beams considering that their use is quite extensive. Experimental studies require quite large costs. So in this research, finite element modeling (FEM) was used to simulate the structural behavior of reinforced concrete dapped-end beams (RC-DEBs). The 2019 version of Abaqus is utilized. There are 5 (five) dapped-end beams analyzed, taken from 5 (five) different published literature. To validate the software, the first simulation work was carried out first on Model-1. The intended simulation results are graphs of load-deflection relationships and crack patterns of dapped-end beams. The results of the FEM analysis should be close to the experimental results. If the validation results are good enough, then the next FEM simulation is carried out for Model-2, Model-3, Model-4 and Model-5. This study presents the results of validation and FEM analysis of five structural models using ABAQUS software. The validation results on Model-1 show that the load-deflection relationship graph is significantly close to the experimental results, with a load ratio of 4.48% and a deflection of 4.46%. The crack analysis in Model1 also reflects a crack pattern that is close to the experimental results, especially in the dapped-end region. Model-2 also provides load-deflection analysis results that are close to experimental results, with a load ratio of 3.33% and deflection of 0.36%, as well as a similar dapped-end crack/damage pattern. Model-3 and Model-4 provide a fairly small load and deflection ratio of 3.94%; 3.87%, and 5.66%; 3.22% respectively, and the crack pattern is close to the experimental results. For Model-5, the resulting load ratio was 10.57% and deflection was 4.21%, while the crack pattern analysis results in the dapped-end area were also comparable to the experimental results. Based on the results of this analysis, it can be concluded that the simulation/modeling carried out by ABAQUS software provides accurate results in predicting the structural behavior of RC-DEBs.