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Material nonlinear analysis of steel fibre reinforced concrete beams failing in shear
Experimental research has pointed out that fibre reinforcement gives valuable contribution for the shear strength of concrete beams. To obtain data to check the validity of the formulation proposed by RILEM TC 162-TDF for the evaluation of the fibres contribution for the concrete shear strength, sets of concrete beams were tested experimentally. To simulate the behaviour of this kind of structures, a computational code was developed, based on the finite element techniques. An accurate simulation of the behaviour of structures failing in a brittle mode, such is the case of the beams failing in shear, is a true challenge in the computational mechanics domain. To reproduce with enough accuracy the fracturing process of this type of elements, a multifixed crack model is implemented. The ability of the post-cracking stress-strain diagram proposed by RILEM TC 162-TDF to simulate the crack propagation is checked. A strain softening trilinear diagram is also derived from inverse analysis using the force-deflection relationship obtained in RILEM three-point notched beam tests. Its capability to model the fracture mode I is also assessed. The numerical strategy developed is described and the appropriateness of the model is evaluated simulating some beams tested experimentally. With the fracture parameters obtained according to this strategy, the behaviour of plain (PC) beams was accurately simulated. Since the force-deflection relationship was obtained up to full energy dissipation of the PC specimens, the fracture parameters are representative of the PC post-cracking behaviour. It is only necessary to consider a size effect factor, to take into account the size of the structure in analysis. In case of steel fibre reinforced concrete (SFRC) beams failing in shear, however, the test is interrupted at about 5 mm, when the energy dissipated is only a fraction of the total energy consumed in the fracturing process. Therefore, the fracture parameters cannot be directly used on the definition of the stress-strain relationship. To simulate the behaviour of experimentally tested SFRC beams, a trilinear stress-strain relationship diagram was defined. The developed model was able of estimating the ultimate load, the most relevant aspects of crack pattern and the deformability up to near the maximum load.
Material nonlinear analysis of steel fibre reinforced concrete beams failing in shear
Experimental research has pointed out that fibre reinforcement gives valuable contribution for the shear strength of concrete beams. To obtain data to check the validity of the formulation proposed by RILEM TC 162-TDF for the evaluation of the fibres contribution for the concrete shear strength, sets of concrete beams were tested experimentally. To simulate the behaviour of this kind of structures, a computational code was developed, based on the finite element techniques. An accurate simulation of the behaviour of structures failing in a brittle mode, such is the case of the beams failing in shear, is a true challenge in the computational mechanics domain. To reproduce with enough accuracy the fracturing process of this type of elements, a multifixed crack model is implemented. The ability of the post-cracking stress-strain diagram proposed by RILEM TC 162-TDF to simulate the crack propagation is checked. A strain softening trilinear diagram is also derived from inverse analysis using the force-deflection relationship obtained in RILEM three-point notched beam tests. Its capability to model the fracture mode I is also assessed. The numerical strategy developed is described and the appropriateness of the model is evaluated simulating some beams tested experimentally. With the fracture parameters obtained according to this strategy, the behaviour of plain (PC) beams was accurately simulated. Since the force-deflection relationship was obtained up to full energy dissipation of the PC specimens, the fracture parameters are representative of the PC post-cracking behaviour. It is only necessary to consider a size effect factor, to take into account the size of the structure in analysis. In case of steel fibre reinforced concrete (SFRC) beams failing in shear, however, the test is interrupted at about 5 mm, when the energy dissipated is only a fraction of the total energy consumed in the fracturing process. Therefore, the fracture parameters cannot be directly used on the definition of the stress-strain relationship. To simulate the behaviour of experimentally tested SFRC beams, a trilinear stress-strain relationship diagram was defined. The developed model was able of estimating the ultimate load, the most relevant aspects of crack pattern and the deformability up to near the maximum load.
Material nonlinear analysis of steel fibre reinforced concrete beams failing in shear
Barros, Joaquim (author) / Gettu, Ravindra (author) / Barragan, Bryan (author)
2004
10 Seiten, 9 Bilder, 3 Tabellen, 7 Quellen
Conference paper
English
Scherfestigkeit , faserverstärkter Beton , Träger (Bauwesen) , Versuchsbericht , Versuchsergebnis , Verbundwerkstoffmechanik , Verbundwerkstoff , Finite-Elemente-Methode , Simulations-Software , Sprödbruchverhalten , Rissbildung , Simulationsmodell , Spannungs-Dehnungs-Diagramm , Kerbschlagversuch , stahlfaserverstärkter Beton , nichtlineares dynamisches System
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