Failure analysis of RC beams subjected to shear through different numerical approaches. (December 2017)

• Record Type: Journal Article
• Authors: Michelini, E.; Bernardi, P.; Cerioni, R.
• Is Part Of: Engineering failure analysis. Volume 82(2017)
• Page Start: 229
• Page End: 242
• Publication Date: 2017-12
• Subjects: Finite element analysis -- Cracks -- Failure analysis -- Plane stress -- Damage assessment; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2017.09.006
• Languages: English
• ISSNs: 1350-6307

Abstract

Abstract: This work discusses and compares different numerical approaches that can be adopted for the analysis up to failure of reinforced concrete beams, also when they experience a brittle shear collapse. Since the development of inclined shear cracks causes a variation of the strain field normal to the element axis, as well as of the shear strains in the beam depth, this type of problem is often dealt with refined bi-dimensional nonlinear finite element analyses. The effectiveness of this type of simulations is in turn mainly related to the adoption of a sound constitutive law for the material. This work highlights that, given the same material model, also more "traditional" approaches, based on sectional analysis or on 1D finite element simulations, can be satisfactorily applied to study the problem, if their kinematic assumptions are improved and extended. In these cases, a subdivision of beam depth into several layers is also recommended. In fact, this allows to both simulate the actual position of steel reinforcement, and to widen the applicability of the method to elements characterized by a generic cross-section shape. Highlights: Two simplified methods are proposed to analyze shear critical RC beams. The methods are respectively based on sectional analysis and 1D FE analysis. The results are compared with standard 2D NLFEA and experimental test results. The results show that both the methods simulate the failure behavior properly. The 1D FE model can be also used to predict beam structural behavior in D-regions.