Numerical Simulation of Prenotched Gravity Dam Models

Barpi, Fabrizio; Valente, Silvio

doi:10.1061/(asce)0733-9399(2000)126:6(611)

Cited by 58 publications

(37 citation statements)

References 18 publications

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“…However, during softening, it is found that the model is not able to capture the mixed mode behaviour and, therefore, numerically the load decays faster than experimentally. It must also be emphasized that during softening the numerical results approach Barpi and Valente's curve (Barpi and Valente 2000).…”

Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

“…An experimental test performed by Barpi and Valente (2000) of a dam model is numerically simulated in this Section. The corresponding structural scheme is represented in Fig.…”

Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

“…25. The adopted material parameters are taken from Barpi and Valente (2000): dead-weight ρ = 2,400 kg/ m 3 ; Young's modulus E = 35.7 GPa; Poisson ratio ν = 0.1; tensile strength f t = 3.6 MPa; and fracture energy G F = 0.184 N/mm. Additionally, the discontinuity is assumed to open in mode-I, with the shear stiffness suddenly dropping to zero when softening is reached.…”

Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

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A comparative study on the modelling of discontinuous fracture by means of enriched nodal and element techniques and interface elements

et al. 2009

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In this paper, three different approaches used to model strong discontinuities are studied: a new strong embedded discontinuity technique, designated as the discrete strong embedded discontinuity approach (DSDA), introduced in Dias-da-Costa et al. [773][774][775][776][777][778][779][780][781] 1976). First, it is shown that all three descriptions are based on the same variational formulation. However, the main differences between these models lie in the way the discontinuity is represented in the finite element mesh, which is explained in the paper. Main focus is on the differences between the element enrichment technique, used in the DSDA and the nodal

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Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

“…An experimental test performed by Barpi and Valente (2000) of a dam model is numerically simulated in this Section. The corresponding structural scheme is represented in Fig.…”

Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

Section: Prenotched Gravity Dam Modelmentioning

confidence: 99%

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A comparative study on the modelling of discontinuous fracture by means of enriched nodal and element techniques and interface elements

et al. 2009

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“…For a two-dimensional problem, Fig. 7-Dam model [7] a path Γ is traversed in a counter-clockwise sense between the two crack surfaces (Fig. 4).…”

Section: Program Algorithmmentioning

confidence: 99%

“…This experimental test was performed without dynamic loading. The hydraulic thrust was generated by means of servo controlled actuator with a 2000 kN capacity and applied to upstream side [7] . This force was distributed in four concentrated loads whose intensity is shown in Fig.…”

Section: Program Algorithmmentioning

confidence: 99%

Crack Growth in Concrete Gravity Dams Based on Discrete Crack Method

Lohrasbi¹,

Attarnejad²

2008

American J. of Engineering and Applied Sciences

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Abstract:Seepage is the most parameter in water management safety and in stable agricultural. This seepage is passed through the cracks that are present to some degree in hydraulic structures. They may exist as basic defects in the constituent materials or may be induced in construction or during service life. To avoid such failure in concrete dams, safety would be an important factor. Over-design carries heavy penalty in terms of excess weight. So the fracture mechanics theory is a principal necessity of evaluating the stability of such crack propagation. For the process of crack propagation analysis in concrete structures, there are two general models: discrete crack and smeared crack. This study surveys the crack propagation in concrete gravity dams based on discrete crack methods. Moreover, we use a program provided specifically for this purpose.

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Fuzzy parameters analysis of time‐dependent fracture of concrete dam models

Barpi

Valente

2002

Num Anal Meth Geomechanics

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SUMMARYIn order to apply the mechanical properties (measured on material specimens or laboratory-sized models) to large structures (such as concrete dams), a non-linear theory able to predict the size-scale effect has to be used. One of these theories was first proposed by Hillerborg and co-workers (fictitious crack model) and is based on the earlier works by Barenblatt and Dugdale for metals (cohesive crack model). It is based on the existence of a fracture process zone (FPZ), where the material undergoes strain softening. The behaviour of the material outside the FPZ is linear elastic.A large number of short-time laboratory tests were executed, by varying the load, under crack mouth opening displacement control. Since concrete exhibits a time-dependent behaviour, an interaction between creep and micro-crack growth occurs in the FPZ. Therefore, different testing conditions can be applied: rupture can be achieved by keeping the load constant before peak value (prepeak tests), or after peak value and after an unloading and reloading procedure (post-peak tests). The crack propagation rate is shown to be small enough to neglect inertial forces and large enough to keep the timedependent behaviour of the process zone as dominant compared to the behaviour of the undamaged and viscoelastic zone.Due to the variability in material microstructure from one specimen to another, experimental data show large ranges of scatter. Well established methods in probability theory require sufficient experimental data in order to assume a probability density distribution. The objective of this study is to investigate the ranges of variation of the time response under constant load in simple structural elements associated with pre-selected variation (fuzziness) in the main material parameters. For situations where the values of the material parameters are of a non-stochastic nature, the fuzzy set approach to modelling variability has been proposed as a better and more natural approach.

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Numerical Simulation of Prenotched Gravity Dam Models

Cited by 58 publications

References 18 publications

A comparative study on the modelling of discontinuous fracture by means of enriched nodal and element techniques and interface elements

A comparative study on the modelling of discontinuous fracture by means of enriched nodal and element techniques and interface elements

Crack Growth in Concrete Gravity Dams Based on Discrete Crack Method

Fuzzy parameters analysis of time‐dependent fracture of concrete dam models

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