Abstract
Accurate modeling is required to investigate the behavior of concrete structures strengthened by carbon fiber-reinforced polymer (CFRP). There is, however, limited knowledge on the use of dynamic modeling to study the crack propagation in the beam-column joints strengthened by CFRP. A finite element model is developed to study crack propagation in the CFRP-strengthened joints under dynamic loads. A three-dimensional model is developed to predict the crack propagation under cyclic loading in the ABAQUS software. In this study, dynamic fracture analysis is used to model the crack propagation in the concrete material. Furthermore, the model is used to predict dynamic debonding in CFRP strengthened with the fracture mechanics approach. The results of the present study showed a good agreement with previous experimental results by about 7.1-11.6 %. The proposed model indicates that the crack propagation is controlled by using CFRP composites in the beam-column joint. Furthermore, it is observed that the width of strut zone in the joint increases by the using of FRP strengthening.
Highlights
One of the most vulnerable structural elements to sudden failure is the beam-column joint for which the crack propagation behaviour needs to be predicted [1, 2]
A carbon fiber-reinforced polymer (CFRP)-wrapped beam-column joint under combined axial and cyclic loadings, which was previously reported in the literature [22], was used to validate the accuracy of the proposed model
The crack patterns were estimated according to the proposed fracture model for the CFRP-strengthened joins
Summary
One of the most vulnerable structural elements to sudden failure is the beam-column joint for which the crack propagation behaviour needs to be predicted [1, 2]. Cracks in the joint start where the beam and column intersect because of stress increase [3]. Basically the shear force in the joint area has to rely on a compression strut zone. The diagonal compression strut zone is made by the diagonal concrete compression force in the joint area. The increased force along the strut zone may cause failure. The study of their behaviour, crack patterns, strut zone, failure mode, and strengthening is essential. Presenting an accurate fracture mechanics model for beam column joints is of great importance owing to the complex behaviour of the joints [7]
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