Buttress Dams

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Richard Malm - One of the best experts on this subject based on the ideXlab platform.

  • Probabilistic analyses of crack propagation in concrete Dams : Part 1
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field ...

  • Evaluating Stability Failure Modes due to Cracks in a Concrete Buttress Dam
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field measurements have shown that most of these cracks have developed or propagated as a result of the seasonal temperature variations. Most Dams in Sweden were built for more than 50 years ago and it is therefore important to also consider the influence of long-term effects and degradation to assess the condition of the dam. In this paper, simulations have been performed with detailed 3D nonlinear numerical analyses in order to study crack initiation and crack propagation due to stochastic variation in material properties, which represent concrete degradation. The structural response due to loads from gravity, hydrostatic water pressure and thermal seasonal effects have been considered in the studies. It was shown that weak material properties near the crack-tip will govern the trajectory of the crack. According to the analyses, significant amount of cracking can occur in the front-plate and Buttress if the strength of the concrete is reduced, which lead to new potential failure modes. In addition, the extent of cracking in the Buttress dam is largely governed by the induced cracking in the front-plate since these cracks have a tendency to propagate into the concrete Buttress. Based on the calculated extent of cracking in the dam body, different failure modes can be assessed in order to determine the dam stability failure.

  • The Influence of Cracks on the Structural Behaviour of a Buttress Dam
    2011
    Co-Authors: Richard Malm, Manouchehr Hassanzadeh, Tobias Gasch, Daniel Eriksson
    Abstract:

    Buttress Dams located in cold areas are often subjected to severe environmental conditions. Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. ...

  • Probabilistic Analyses of Thermal Induced Cracking in a Concrete Buttress Dam
    2011
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. The theoretical analysis and field measurements have showed that the most of the cracks are ...

  • Cracking of Concrete Buttress Dam Due to Seasonal Temperature Variation
    ACI Structural Journal, 2011
    Co-Authors: Richard Malm, Anders Ansell
    Abstract:

    The largest and most important hydropower Dams in Sweden are concrete Buttress Dams. These consist of a large number of concrete monoliths formed by a frontplate with a supporting Buttress. Cracks ...

Manouchehr Hassanzadeh - One of the best experts on this subject based on the ideXlab platform.

  • Probabilistic analyses of crack propagation in concrete Dams : Part 1
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field ...

  • Evaluating Stability Failure Modes due to Cracks in a Concrete Buttress Dam
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field measurements have shown that most of these cracks have developed or propagated as a result of the seasonal temperature variations. Most Dams in Sweden were built for more than 50 years ago and it is therefore important to also consider the influence of long-term effects and degradation to assess the condition of the dam. In this paper, simulations have been performed with detailed 3D nonlinear numerical analyses in order to study crack initiation and crack propagation due to stochastic variation in material properties, which represent concrete degradation. The structural response due to loads from gravity, hydrostatic water pressure and thermal seasonal effects have been considered in the studies. It was shown that weak material properties near the crack-tip will govern the trajectory of the crack. According to the analyses, significant amount of cracking can occur in the front-plate and Buttress if the strength of the concrete is reduced, which lead to new potential failure modes. In addition, the extent of cracking in the Buttress dam is largely governed by the induced cracking in the front-plate since these cracks have a tendency to propagate into the concrete Buttress. Based on the calculated extent of cracking in the dam body, different failure modes can be assessed in order to determine the dam stability failure.

  • The Influence of Cracks on the Structural Behaviour of a Buttress Dam
    2011
    Co-Authors: Richard Malm, Manouchehr Hassanzadeh, Tobias Gasch, Daniel Eriksson
    Abstract:

    Buttress Dams located in cold areas are often subjected to severe environmental conditions. Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. ...

  • Probabilistic Analyses of Thermal Induced Cracking in a Concrete Buttress Dam
    2011
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. The theoretical analysis and field measurements have showed that the most of the cracks are ...

  • Crack propagation in Buttress Dams : Application of non-linear models - Part II
    2010
    Co-Authors: Anders Ansell, Tomas Ekström, Manouchehr Hassanzadeh, Richard Malm
    Abstract:

    The largest and most important concrete Dams in Sweden are Buttress Dams. These consist of a large number of concrete monoliths formed by a front-plate with a supporting Buttress. Cracks have been ...

Luigi Piroddi - One of the best experts on this subject based on the ideXlab platform.

  • seismic behaviour of Buttress Dams non linear modelling of a damaged Buttress based on arx narx models
    Journal of Sound and Vibration, 2001
    Co-Authors: P. Palumbo, Luigi Piroddi
    Abstract:

    Abstract The paper reports a full model identification study carried out on a scale model of a dam Buttress subjected to seismic-like excitations generated by means of a shake table. The use of linear and non-linear models is discussed, since the Buttress has an artificial crack and is subjected to high-intensity inputs. In particular, a suitable class of polynomial NARX models is considered, which captures most of the system dynamics. Several questions related to the NARX identification methodology are addressed in the paper; use of non-linear models greatly increases model accuracy and reliability, but many specific operational problems arise in practice. In particular, the validity of classical model selection approaches is questionable; satisfactory non-linear models are obtained in this case with many fewer parameters than suggested by conventional performance indices. Also, it is difficult to guarantee a satisfactory model performance in simulation and, sometimes, even stability is hard to obtain. With reference to specific identified models a further analysis step is carried out, which shows the evolution of the dynamic characteristics of the model in the various phases of the earthquake-like excitation. Also, the role of the particular non-linearities included in the model is discussed.

  • SEISMIC BEHAVIOUR OF Buttress Dams: NON-LINEAR MODELLING OF A DAMAGED Buttress BASED ON ARX/NARX MODELS
    Journal of Sound and Vibration, 2001
    Co-Authors: P. Palumbo, Luigi Piroddi
    Abstract:

    Abstract The paper reports a full model identification study carried out on a scale model of a dam Buttress subjected to seismic-like excitations generated by means of a shake table. The use of linear and non-linear models is discussed, since the Buttress has an artificial crack and is subjected to high-intensity inputs. In particular, a suitable class of polynomial NARX models is considered, which captures most of the system dynamics. Several questions related to the NARX identification methodology are addressed in the paper; use of non-linear models greatly increases model accuracy and reliability, but many specific operational problems arise in practice. In particular, the validity of classical model selection approaches is questionable; satisfactory non-linear models are obtained in this case with many fewer parameters than suggested by conventional performance indices. Also, it is difficult to guarantee a satisfactory model performance in simulation and, sometimes, even stability is hard to obtain. With reference to specific identified models a further analysis step is carried out, which shows the evolution of the dynamic characteristics of the model in the various phases of the earthquake-like excitation. Also, the role of the particular non-linearities included in the model is discussed.

Daniel Eriksson - One of the best experts on this subject based on the ideXlab platform.

  • Probabilistic analyses of crack propagation in concrete Dams : Part 1
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field ...

  • Evaluating Stability Failure Modes due to Cracks in a Concrete Buttress Dam
    2013
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Several concrete Buttress Dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field measurements have shown that most of these cracks have developed or propagated as a result of the seasonal temperature variations. Most Dams in Sweden were built for more than 50 years ago and it is therefore important to also consider the influence of long-term effects and degradation to assess the condition of the dam. In this paper, simulations have been performed with detailed 3D nonlinear numerical analyses in order to study crack initiation and crack propagation due to stochastic variation in material properties, which represent concrete degradation. The structural response due to loads from gravity, hydrostatic water pressure and thermal seasonal effects have been considered in the studies. It was shown that weak material properties near the crack-tip will govern the trajectory of the crack. According to the analyses, significant amount of cracking can occur in the front-plate and Buttress if the strength of the concrete is reduced, which lead to new potential failure modes. In addition, the extent of cracking in the Buttress dam is largely governed by the induced cracking in the front-plate since these cracks have a tendency to propagate into the concrete Buttress. Based on the calculated extent of cracking in the dam body, different failure modes can be assessed in order to determine the dam stability failure.

  • The Influence of Cracks on the Structural Behaviour of a Buttress Dam
    2011
    Co-Authors: Richard Malm, Manouchehr Hassanzadeh, Tobias Gasch, Daniel Eriksson
    Abstract:

    Buttress Dams located in cold areas are often subjected to severe environmental conditions. Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. ...

  • Probabilistic Analyses of Thermal Induced Cracking in a Concrete Buttress Dam
    2011
    Co-Authors: Richard Malm, Tobias Gasch, Daniel Eriksson, Manouchehr Hassanzadeh
    Abstract:

    Recent assessments and investigations of Buttress Dams in northern Sweden reveal several types of cracks. The theoretical analysis and field measurements have showed that the most of the cracks are ...

Shen Chang-song - One of the best experts on this subject based on the ideXlab platform.

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