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Item type:Publication, Access status: without files , Shear Failure Analysis with Modelling Multiple Discontinuities in a Concrete Beam Using XFEM(2022-08); Despite intensive research in the last decades, the shear force transfer and crack propagation in structural concrete members is still disputed. In order to investigate the load bearing behaviour, an understanding of crack growth and flow of internal forces is essential. In this context, various techniques have been developed in the recent years to analyze the crack pattern and to detect fracture failure in advance. This paper presents the investigation of discrete crack propagation and the shear bearing behaviour of a concrete beam without transverse reinforcement using the extended finite element method (XFEM). By applying the cohesive zone model (CZM) under different traction separation laws and describing the damage evolution, crack growth is modelled with several discontinuities. In this framework, the load bearing behavior and the development of the crack with its dimensions are discussed. Linear, bilinear and nonlinear softening curves of the fracture process zone for the investigation of one to several cracks are presented. The numerical analysis are validated by experimental results. The findings are compared and evaluated with the isotropic material model ‘concrete damage plasticity’ (CDP). The smeared and discrete crack pattern are contrasted. It is concluded that the numerical analyses make useful predictions of the fracture behavior of reinforced concrete members and provide further possibilities for research purposes.Publicationtype: Conference Paper68 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Simulation of crack growth in reinforced concrete beams using extended finite element method(2020-10); Fracture mechanics and the crack propagation in reinforced concrete members is one of the most important approaches to structural safety analysis. Thanks to powerful software and increasingly fast computers, numerical simulation is well suited to analyse even more complex problems, such as crack growth, quickly and economically. In order to validate these analyses in their application, however, it is still necessary to confirm and compare numerous models of load-bearing and material behaviour by experimental investigations. This paper presents nonlinear numerical simulations of bending and shear crack propagation in reinforced concrete beams without transverse reinforcement. The smeared and discrete crack growth of haunched and non-haunched beams is analysed. Compared are the load deformation behaviour and curves which show the crack width in relation with the applied load without building a notch in the structure. The obtained results are presented with different mesh densities. The tests and the numerical simulations will provide a broad interpretation of crack growth and redistribution of inner forces in concrete members. As numerical method to map discrete cracks the extended finite element method (XFEM) is applied. For validation, the crack patterns of real experiments are compared with the results of the different finite element models up to two crack initiations. The evaluation is based on single span beams under bending and shear. The numerical simulations make it possible to predict the fracture behaviour of concrete members and shows good agreement with the experimental results.Publicationtype: Journal Article157 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Numerical analysis of shear crack propagation in a concrete beam without transverse reinforcementCrack formation and growth in reinforced concrete members is, in many cases, the cause for the collapse of buildings. Such serious failures impair the structural behavior and can also damage property and persons. An intensive investigation of the crack propagation is indispensable. Numerical methods are being developed to analyze crack growth in a concrete member and to detect fracture failure at an early stage. For reinforced concrete components, however, further research and action is required in the analysis of shear cracks. This paper presents numerical simulations and continuum mechanical modeling of bending shear crack propagation in a concrete beam without transverse reinforcement. As numerical method to map discrete cracks the extended finite element method (XFEM) is applied. The crack propagation is compared with the smeared crack approach using concrete damage plasticity material model. For validation, the crack patterns of a real beam tests are compared with the results of the different finite element models. The numerical analysis will provide further understanding of crack growth and redistribution of inner forces in concrete members. The XFEM makes it possible to predict the fracture behavior of concrete members.Publicationtype: Journal ArticleScopus© Citations 11 258 316