To simulate the material nonlinear behavior of thin fiber reinforced concrete frc structures, where out of plane shear deformation might be appreciable, the reissnermindlin theory was selected 1945, 1951. The application of the combined finitediscrete element method fdem to simulate fracture propagation in fibrereinforcedconcrete frclined tunnels has been investigated. The objective of this program is to develop theoretical formulations and experimental testing techniques for modeling the fracture process in plain concrete and fiber reinforced concrete materials. Fracture analysis of high strength and ultra high strength concrete. The bridging fibre action increase the stress carried across the crack.
The mathematical implementations of the new fdem jointelement constitutive model are first introduced. Simulation of crack propagation in fiber reinforced concrete by fracture mechanics journal article jun, zhang. In the present paper, the fracture behavior of steel fiber reinforced concrete sfrc slabsonground is studied by using nonlinear fracture mechanics nlfm finite element fe analyses. Prediction of fatigue life of reinforced concrete bridges. Simulation of the mode i fracture of concrete beam with. These results show the capabilities of fdem for better understanding of the fracture mechanics and crack propagation in frc tunnels. Effect of steel fibre profile on the fracture characteristics of steel fibre. Accurate modeling is required to investigate the behavior of concrete structures. Micronanoscale models and experiments matthieu vandamme a. Simulation of crack propagation in asphalt concrete using an. These enhancements are provided by bridging phenomena and multiplecracking distribution 1. New design approach for steel fiberreinforced concrete slabs.
Kononova2 and andrejs pupurs 3 1,2,3 concrete mechanics laboratory, riga technical university, lv 1048, riga, latvia keywords. Mode i crack propagation in fiber reinforced concrete frc is simulated by a fracture mechanics approach. Fracture mechanics of concrete and concrete structures. The current study presents numerical and experimental approaches in the assessment of fracture behavior of selfconsolidating concrete beams strengthened with carbon fiber reinforced polymer cfrp lamina. However, cohesive elements can also be placed between element faces as a mechanism for allowing individual elements to separate. Figure below shows the role of fibers in stopping a crack from propagation perpendicular to the fiber direction, and forming delamination cracks instead. Simulation of crack propagation in fiberreinforced concrete by. Crack propagation modeling in quasibrittle materials such as concrete is essential for improving the reliability and loadbearing capacity assessment. The failure modes, midspan displacement, and the loadbearing capacity of specimens with initial notches at midspan are analyzed by varying the notch length and the beam. In this paper, the crack propagation along frp concrete interface of frpstrengthened concrete structures is analyzed by using nonlinear fracture mechanics, in which the concept of mode ii fracture is applied to describe the interfacial fracturing behavior by means of a cohesive crack model with a local shear stressslip relationship. Simulation mechanicsdriven crack propagation along a known crack surface.
As assembly of the global stiffness matrix is avoided and each mass particle motion is. Simulation of fracture propagation in fibrereinforced. Li, victor c cement and concrete research mode i crack propagation in fiber reinforced concrete frc is simulated by a fracture mechanics approach. Fatigue crack propagation behavior of rc beams strengthened. Fracture mechanics has been applied to plain and fibre reinforced concrete with increasing success over recent years. Cover cracking of reinforced concrete beams due to corrosion of steel. Interface crack propagation in fiber reinforced polymer. Finite element simulation of crack propagation for steel fiber reinforced concrete ozenc. Fracture of fibre reinforced concrete beams with low fibre content 793 chang t. The simulation of damage and failure in short fiber reinforced composites like high performance hybrid fiber reinforced cement composites is still a challenging task, due to the richness of failure mechanisms introduced by fibers on the mesoscale of the material. Xu shiliang36 and jeng proposed doublek fracture criterion for fracture mechanics of concrete. Crack propagation in fiber reinforced composites a semianalytical method for determining cohesive laws linda storvall, david bergstrand when describing material properties in fiber reinforced composites, cohesive laws are needed. Zhang and li 2004 simulated the crack propagation in fiber re inforced concrete by using fracture mechanics principles. In this paper, the crack propagation along frpconcrete interface of frpstrengthened concrete structures is analyzed by using nonlinear fracture mechanics, in which the concept of mode ii fracture is applied to describe the interfacial fracturing behavior by means of a cohesive crack model with a local shear stressslip relationship.
Steel fiber reinforced concrete sfrc has proven to provide excellent mechanical performance in terms of increased strength, ductility and energy absorption capacity 1. Residual crack opening in fiberreinforced structural. The model was developed by fracture criterion using abaqus virtual crack. This workshop extended these concepts to steel bar rei. Numerical modeling of tensile crack propagation in concrete dams. Errata for simulation of crack propagation in asphalt concrete using an intrinsic cohesive zone model by s. Crack propagation explains many failure characteristics of concrete structures using the fracture mechanics approach. The flexural response of ultrahigh performance fiber reinforced concrete uhpfrc was simulated based on the lattice fracture model. Consistently to the fracture mechanics, the crack propagation depends from the energy release rate and its mode components, which are calculated by means of the decomposition methodology of the jintegral expression. Using finite element software to simulation fracture behavior. Fracture mechanics, crack propagation, prestressed concrete sleeper b70, crack length, cmod. Coupling analysis of fracture mechanics and damage mechanics.
Simulation of crack propagation in fibrereinforced concrete by fracture mechanics. Simulation of fracture propagation in fibrereinforced concrete using. Mechanical performance and numerical simulation of basalt fiber. An equivalent elastoplastic damage model based on micromechanics for hybrid fiberreinforced composites under uniaxial tension zhiguo yan, yao zhang, j woody ju, qing chen, and hehua zhu international journal of damage mechanics 2017 28. The basalt fiber with length of 6 mm and 12 mm was added into concrete in the. The simulation of damage and failure in short fiber reinforced composites like high performance hybridfiber reinforced cement composites is still a challenging task, due to the richness of failure mechanisms introduced by fibers on the mesoscale of the material. Modeling and experimental investigation andrejs krasnikovs1, o. The failure modes, midspan displacement, and the loadbearing capacity of specimens with initial notches at midspan are analyzed by varying the notch length and the beam height.
The model relies on the fracture toughness of hardened cement paste k ic and the crack bridging law, socalled stresscrack width. This volume emphazises the most recent advances in fracture mechanics as specifically applied to steel bar reinforced concrete. Simulation of the flexural response of ultrahigh performance. The fracture mechanics method has been validated by results from experiments performed by the authors as well as by test results available in the literature. Cohesive laws can be thought of as a nonlinear spring trying to counteract the crack propagation. This constitutes the first attempt of using fdem for the simulation of fracture in frc structures. This analysis is based on fracture mechanics concepts applied to the cyclic loading behaviour of fiber reinforced concrete crosssections. The simulated results were compared with the experimental results. Application of fracture mechanics to cementitious composites. Tang chunan focused on fracture mechanism and numerical. Nov 11, 2006 errata for simulation of crack propagation in asphalt concrete using an intrinsic cohesive zone model by s. Simulation of crack propagation in asphalt concrete using an intrinsic cohesive zone model seong hyeok song1. Vector form intrinsic finite element based approach to. The crack then extends in the plate until the plate splits into two parts.
A superposition method is applied to calculate the crack tip stress intensity factor. Fracture mechanics based on the principle that the stress state near to the crack tip is uniquely described by a single parameter, the stress intensity factor k, or under cyclic loading conditions, the prediction of fatigue life of reinforced concrete bridges using fracture mechanics m. The flexural response of ultrahigh performance fiberreinforced concrete uhpfrc was simulated based on the lattice fracture model. Dynamic crack propagation in fiber reinforced composites. The proposed model considers the elementary phenomena of propagation of a crack, yielding or slippage of fibers, plastic shakedown and hysteresis, and defines the structural response by means of a. Reactive powder concrete rpc is made of very fine matrix with short steel fibres.
An equivalent elastoplastic damage model based on micromechanics for hybrid fiber reinforced composites under uniaxial tension zhiguo yan, yao zhang, j woody ju, qing chen, and hehua zhu international journal of damage mechanics 2017 28. Dec 14, 2007 the initial damage and fracture zone are determined by the approach of coupling analysis of fracture mechanics and damage mechanics. A finite element model is developed to study crack propagation in the. Crack propagation analysis massachusetts institute of. Crack propagation in fiberreinforced composites a semianalytical method for determining cohesive laws linda storvall, david bergstrand when describing material properties in fiberreinforced composites, cohesive laws are needed. Experimental verification and simulation of fracture behavior. Fiber was modelled as separated beam that was connected to the matrix with interface beams. Dec, 2019 the application of the combined finitediscrete element method fdem to simulate fracture propagation in fibre reinforced concrete frclined tunnels has been investigated. Propagation of cracks in reinforced concrete beams cracked and. A superposition method is applied to calculate the. The proposed vfifejintegral method was validated by elastic crack simulation of a notched plate, and the vfifefcm method by cohesive crack propagation of a three point bending beam. This is a practical paper which consists of investigating fracture behavior in asphalt concrete using an intrinsic cohesive zone.
Deviations occurred at the late stage of the strainsoftening period. To simulate the material nonlinear behavior of thin fiber reinforced concrete frc structures, where outofplane shear deformation might be appreciable, the reissnermindlin theory was selected 1945, 1951. On the theory and numerical simulation of cohesive crack. Fracture mechanics parameters were calculated by fem based on anisotropic elasticity, and the golden ratio which has always been regarded as a model of beauty, for its geometric shape and. The proposed approach is based on a generalized formulation based on the fracture mechanics approach and moving mesh methodology.
In the present paper, the fracture behavior of steel fiberreinforced concrete sfrc slabsonground is studied by using nonlinear fracture mechanics nlfm finite element fe analyses. Simulation of mode i crack propagation in fiber reinforced. Simulation of mode i crack propagation in fiber reinforced concrete by fracture mechanics article in cement and concrete research 342. The ksuperposition method is adopted to calculate the net stress intensity factor at the crack tip. The book, based on a nato advanced study institute, is a comprehensive survey of treating nonlinearity associated with crack growth in brittle materials such as cement. Fatigue crack propagation in bfrp reinforced rc beams. The current study presents numerical and experimental approaches in the assessment of fracture behavior of selfconsolidating concrete beams strengthened with carbon fiberreinforced polymer cfrp lamina. Feb 01, 2004 mode i crack propagation in fiberreinforced concrete frc is simulated by a fracture mechanics approach. Fatigue crack propagation in bfrp reinforced rc beams based.
This paper discusses the analytical simulation of crack propagation using the fictitious crack model for notched and unnotched portland cement concrete beam specimens. The development of a dynamic fracture propagation model for frp. The damage due to crack formation and propagation was simulated by discretizing the thickness of the shell in several layers. This work contains 27 chapters which cover recent advances in fracture mechanics applied to cementbased composites. The mathematical implementations of the new fdem jointelement constitutive model are first introduced, and the numerical. The study of crack formation and propagation, referred to as fracture mechanics, was founded in the seminal work on brittle cracks by gri.
Finite element analyses on integral for main crack of rc beam strengthened with cfrp under threepoint bending load were completed based on nonlinear fracture mechanics and cohesive zone model under hotwet environment, and the fatigue crack propagation tests of the rc beams strengthened with cfl under hotwet environment were carried out, and. The initial damage and fracture zone are determined by the approach of coupling analysis of fracture mechanics and damage mechanics. Abstractthe influence of fiber orientation on crack propagation has been studied with bfrp reinforced rc beams. Baiant, elsevier applied science, london, 1140 reprinting of s25. Flexural behavior of steel fiber reinforced concrete testing and modeling.
The linear elastic fracture mechanics lefm approach is adopted to pursue the. Mode i crack propagation in fiberreinforced concrete frc is simulated by a fracture mechanics approach. Presenting an accurate fracture mechanics model for beam column joints is of. Simulation of crack propagation in fiberreinforced concrete. Li, victor c cement and concrete research mode i crack propagation in fiberreinforced concrete frc is simulated by a fracture mechanics approach.
Formation of cracks in asphalt concrete pavements can be the result of the following. Parameters such as those controlling the loading conditions, mesh fineness, aspect ratio in the vertical or horizontal directions, and notch to beam thickness ratio are considered. Computational models for fracture fracture mechanics for. Explicit finite element modeling of static crack propagation in reinforced concrete.
Fracture mechanics based analysis of self compacting concrete. Simulation of crack propagation in fiberreinforced concrete by fracture mechanics journal article jun, zhang. Damage simulation of high performance fiber reinforced. Yoshinori kitsutaka, fracture mechanics based bending failure analysis for fiber reinforced lightweight concrete panel considering crack dispersion effect, th world conference on. Cohesive fracture model for functionally graded fiber. Mode i crack propagation and steel fibers are treated. Mode i crack propagation and steel fibers are treated in the roposed model. This analysis is based on fracture mechanics concepts applied to the cyclic loading behaviour of fiberreinforced concrete crosssections. Fracture of fibrereinforced concrete beams with low fibre content 793 chang t. In this paper, a fracture mechanics approach is presented to model the cracking behavior of and interfacial debonding process in frpstrengthened concrete beams. Sfrc, experimentation, interface elements, crack propagation abstract. Steel fibre concrete, ductility, post crack toughness. Applications of fracture mechanics to reinforced concrete.