Softening of concrete in compression — Localization and size effects

Markeset, Gro; Hillerborg, Arne

doi:10.1016/0008-8846(95)00059-l

Cited by 160 publications

(114 citation statements)

References 3 publications

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“…Intermediate scenarios can occur for different degrees of friction and slenderness; they are characterized mainly by inclined shear band zone. Regarding damage localization under compression, experimental observation by [Kotsovos 1983; Van Mier 1984; Jansen, Shah 1997] showed strain localization; analytical investigation by [Markeset, Hillerborg 1995] showed that the concept of fracture energy in tension holds true for compression. This gives the evidence to use the fracture energy-based regularization in describing the softening of concrete under compression [Van Mier 2013].…”

Section: Mesh-insensitivity Verificationmentioning

confidence: 99%

New methodology for calculating damage variables evolution in Plastic Damage Model for RC structures

Alfarah

Almansa

Oller

2017

Engineering Structures

342

178

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Abstract:The behavior of reinforced concrete (RC) structures under severe demands, as strong ground motions, is highly complex; this is mainly due to joint operation of concrete and steel, with several coupled failure modes. Furthermore, given the increasing awareness and concern for the important seismic worldwide risk, new developments have arisen in earthquake engineering. Nonetheless, simplified numerical models are widely used (given their moderate computational cost), and many developments rely mainly on them. The authors have started a long-term research whose final objective is to provide, by using advanced numerical models, solid basis for these developments. Those models are based on continuum mechanics, and consider Plastic Damage Model to simulate concrete behavior. Within this context, this paper presents a new methodology to calculate damage variables evolution; the proposed approach is based in the Lubliner/Lee/Fenves formulation and provides closed-form expressions of the compressive and tensile damage variables in terms of the corresponding strains. This methodology does not require calibration with experimental results and incorporates a strategy to avoid mesh-sensitivity. A particular algorithm, suitable for implementation in Abaqus, is described. Mesh-insensitivity is validated in a simple tension example. Accuracy and reliability are verified by simulating a cyclic experiment on a plain concrete specimen. Two laboratory experiments consisting in pushing until failure two 2-D RC frames are simulated with the proposed approach to investigate its ability to reproduce actual monotonic behavior of RC structures; the obtained results are also compared with the aforementioned simplified models that are commonly employed in earthquake engineering.

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Section: Mesh-insensitivity Verificationmentioning

confidence: 99%

New methodology for calculating damage variables evolution in Plastic Damage Model for RC structures

Alfarah

Almansa

Oller

2017

Engineering Structures

342

178

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“…This height represents the lower portion of the confined boundary in a wall where likely compressive failure may occur. Observations from previous experimental studies indicate that the compressive failure region is quite limited within a height of about 2.5 times the wall thickness (Markeset and Hillerborg 1995;Takahashi et al 2013). The elements were cast vertically in two stages, the lower stub was cast first and then the element and the upper stub as one part with intentionally roughened surface created at lower stub-element interface to insure adherence.…”

Section: Description Of the Test Specimensmentioning

confidence: 94%

Performance of Confined Boundary Regions of RC Walls under Cyclic Reversal Loadings

Taleb

Tani

Kôno

2016

ACT

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Observed damages in reinforced concrete wall buildings following some recent earthquakes raised concerns about the seismic performance of rectangular RC walls. Damages in RC walls included spalling and crushing of concrete and longitudinal reinforcement buckling at boundaries as well as global buckling. Preliminary studies attributed these damages to the lack of adequate confinement and detailing in wall boundary regions and high axial load level. Prism specimens representing wall boundaries were tested to study the influence of reinforcement detailing, cross-section slenderness, and loading type on the damages, failure modes, and compressive capacity of isolated confined boundary regions of RC rectangular walls. It was found that the tensile strain prior to compressive strain affected the performance of thin wall boundaries and may lead to different failure modes when subjected to cyclic loading. It was also found that dense transverse reinforcement detailing in thin confined boundaries did not improve their compressive capacity. Design and detailing rules to prevent global buckling and reinforcement bar buckling were also evaluated. A Numerical model that takes into account buckling of reinforcement was proposed to simulate response curves of cyclically tested specimens. The model showed the influence of reinforcement buckling behavior on reducing the compressive capacity for elements with buckling of reinforcement failure.

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“…Two remaining consistent tangent stiffness matrix elements qdr 1 qe 2 and qdr 1 qe 3 of the differential stress increment dr 1 are:…”

Section: Consistent Tangent Stiffness Matrixmentioning

confidence: 99%

Parametric analysis of constant‐moment zone length in four point bending of reinforced concrete beams

Galić

Marović

Harapin

2013

Materialwissenschaft Werkst

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This paper describes performed numerical parametric analyses of constant-moment zone length in four point bending of reinforced concrete structures by a developed three-dimensional numerical material model for analyzing reinforced concrete structures. The model is defined by elementary material parameters which can be obtained by a standard uniaxial test so that the very complex behaviour of reinforced concrete structures can be described simply and effectively but with a sufficiently accurate model.

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Softening of concrete in compression — Localization and size effects

Cited by 160 publications

References 3 publications

New methodology for calculating damage variables evolution in Plastic Damage Model for RC structures

New methodology for calculating damage variables evolution in Plastic Damage Model for RC structures

Performance of Confined Boundary Regions of RC Walls under Cyclic Reversal Loadings

Parametric analysis of constant‐moment zone length in four point bending of reinforced concrete beams

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