Cyclic and Seismic Nonlinear Modelling of Concrete Structures Using Damage Model and Multilayered Beam Elements (original) (raw)
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Modeling Material Failure in Concrete Structures under Cyclic Actions
Journal of Structural Engineering, 2004
A constitutive model devised for the analysis of concrete structures, and suitable for generic two-or three-dimensional applications, is presented and validated. For plain concrete a tension-compression distinguishing stress split is performed, and two scalar damage variables account for the degradation induced by the tensile and compressive stress components. As outcomes the model reproduces the stiffness recovery upon load reversal, and it captures the strength enhancement under multiaxial compression. Besides, the simple formulation as well as the extremely reduced number of parameters involved in the concrete model makes it quite suitable for the analysis of real structures, and constitutes a useful design tool. As regards to the nonlinear performance of the steel reinforcement, the explicit Giuffrè-Menegotto-Pinto model is adopted. Efficiency of the global model is illustrated via two seismic applications: one concerning an arch dam, and the other a six-floor reinforced concrete wall. The latter application is presented for validation purposes.
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This work aims to develop and identify a new model for reinforced concrete joint element subject to cyclic loadings. Based on experiments and 3D numerical modeling, a simplified model of RC beam-column joint is introduced (within the framework of macro-element). In a first experimental study, this joint will be tested under reverse cyclic loading applied at the beam tip to identify its behavior under this kind of loading in terms of strength, stiffness and ductility. In parallel of experiments, a finite elements model of the joint based on 3D finite elements is presented to highlight and define the nonlinear mechanisms involved in the ruin of the assembly. This step will confirm the experimentally observed phenomena: damage, friction, plasticity. Secondly, a simplified macro-element model for beam-column joint, associated to a nonlinear behavior, is introduced to reflect the response of the joint under cyclic loading loads. Model parameters will be identified from experimental resul...
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Cementitious matrix damage conditions the behavior of concrete and concrete structures under static and dynamic loading. For this purpose, we present here a strategy to deal with the problem in real structures, which requires a combination of an efficient behavior model, the μ damage model, and a description of the structures based on a simplified finite element modeling using multifiber beams
Nonlinear damage behaviour of concrete structures
Canadian Journal of Civil Engineering, 2005
Concrete structures are becoming more and more sophisticated and submitted to severe conditions, for example: high stresses and temperatures, cyclic loadings, earthquakes, etc. It is therefore necessary to simulate correctly the behaviour and damage of such structures. However, the behaviour of this material is among the most complex ones: various phenomena are observed experimentally, such as, loss of stiffness, irreversible strains, stiffness recovery and dissymmetric behaviour to mention a few. If all these effects are taken into consideration, it would lead to models that use numerous parameters. In this paper, a framework for damage mechanics of concrete is presented and used to simulate the nonlinear behaviour of concrete using finite element method (FEM). A relatively simple isotropic damage model, containing essentially no adjustable parameters is shown to produce results in remarkably good agreement with experimental results. Indeed, the damage law requires only the fractur...
Application of Nonlinear Concrete Model for Finite Element Analysis of Reinforced Concrete Beams
The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complicated phenomenon due to the involvement of heterogenic material properties and cracking behavior of concrete. Behavior prediction of reinforced concrete elements till failure is usually carried out using experimental testing, and the observations are recorded only at critical locations due to restriction in cost of testing equipment and accessories. In order to avoid the destructive testing, reduction of the cost of materials and manpower, the behavior prediction of RC beams is generally carried out using numerical methods. This paper presents study on non-linear flexural behavior of reinforced concrete beams. Non-linear finite element analysis of reinforced concrete beams under flexural loading is presented in this paper. Finite element modelling of reinforced concrete beams is carried out using discrete reinforcement modelling technique. The capability of the model to capture the critical crack regions, loads and deflections for various loadings in reinforced concrete beam has been illustrated. Comparison is made between the experimental results and finite element analyses with respect to initial crack formation and the ultimate load capacity of beams. The results obtained in the present study show close agreement with those in the available literature.
International Journal of Structural and Civil Engineering Research, 2020
Reliable design of reinforced concrete (RC) structures against earthquake has received considerable attention for many decades. It is vital that RC members exhibit sufficient strength and ductility under combinations of gravity loads and cyclic lateral excitations caused by earthquakes. To that end, this study presents an Enhanced Concrete Damage Plasticity Model (ECDPM) for predicting the cyclic behavior of plain concrete under multiaxial loading conditions, which combines the theories of classic plasticity and continuum damage mechanics. This model employs two damage variables for describing the influences of tensile and compressive damages on overall behavior. The capability of the model to predict the cyclic response of plain concrete is evaluated using experimental data from a uniaxial tension test, as well as uniaxial, biaxial and triaxial compression tests. Very good agreement is generally observed between the numerical predictions and test data. Various shortcomings of the model are also identified to aid future development efforts. Index Terms-damage-plasticity model, plain concrete, cyclic loading, multiaxial loading conditions 273
Simplified damage models applied in the numerical analysis of reinforced concrete structures
Revista IBRACON de Estruturas e Materiais, 2012
This work presents one and two-dimensional numerical analyses using isotropic and anisotropic damage models for the concrete in order to discuss the advantages of these modeling. Initially, it is shortly described the damage model proposed by Mazars. This constitutive model assumes the concrete as isotropic and elastic material, where locally the damage is due to extensions. On the other hand, the damage model proposed by Pituba, the material is assumed as initial elastic isotropic medium presenting anisotropy, plastic strains and bimodular response (distinct elastic responses whether tension or compression stress states prevail) induced by the damage. To take into account for bimodularity two damage tensors governing the rigidity in tension and compression regimes, respectively, are introduced. Damage activation is expressed by two criteria indicating the initial and further evolution of damage. Soon after, the models are used in numerical analyses of the mechanical behavior of rei...
The paper deals with realistic modelling of concrete structures and material damage using nonlinear finite element method. Tensile and shear cracks or compressive crushing develop in concrete due to various reasons and can considerably influence resistance and durability of concrete structures. Numerical investigations have been carried out in order to analyze, predict and prevent concrete damage using nonlinear computer simulation based on advanced material models and finite element methods.
Nonlinear Cyclic and Earthquake Response Analysis of Reinforced Concrete Structures
This paper presents a simplified method based on energy formulation for nonlinear analysis of reinforced concrete frame structures up to ultimate failure, which has been implemented in Open System for Earthquake Engineering Simulation framework (OpenSees). In the simplified method, a reinforced concrete member is modeled by an equivalent member of homogeneous nonlinear material with a derived stress-strain relationship, which satisfies the requirement that the equivalent member has the same moment-curvature behaviour as the original member. One advantage of the simplified method is its simplicity which can be easily implemented in most structural analysis computer program with nonlinear modeling capacities. The developed model can accurately predict the nonlinear hysteretic behaviour of reinforced concrete structures with frame members of arbitrary shapes and reinforcing details under severe earthquake excitations. Numerical examples of single bridge column structures of regular reinforced concrete members or double-skinned concrete filled tube members and a 2-story 2-bay reinforced concrete frame are analyzed using the simplified method under monotonic, cyclic and earthquake loadings to demonstrate the validity and accuracy of the simplified method. The effects of confinement, steel hardening, stiffness degradation and softening, pinching, and strength deterioration are simulated in the developed method. A correlation study has been carried out to compare the computer simulation results by the developed method with the experimental measurements of a full scale 3-story 3-bay reinforced concrete steel frame tested at the National Center for Research on Earthquake Engineering (NCREE) Taiwan, as a part of the joint research between Carleton University and NCREE. Results from the proposed method agree well with experiment test results and predictions from finite element and fiber models.