Assessing the behaviour of reinforced concrete columns under blast loads

    Research output: ThesisDoctoral Thesis

    Abstract

    This thesis is concerned with the numerical investigation of the structural response of reinforced concrete columns under blast loads, by means of dynamic nonlinear finite element analysis. This study provides an in depth understanding of the mechanics underlying reinforced concrete structural response under blast loading and studying the effect of certain important design parameters on the exhibited behaviour. The numerical investigation was carried out through the use of a well-established commercial finite element package (Abaqus) and employed a numerical model capable of accounting for the brittle nature of concrete. The latter model forms an extension to the ‘brittle crack’ model (already available in Abaqus) and was developed in order to overcome the shortcomings of the existing concrete model in describing concrete material behaviour in compression. The verification of the validity of the numerical predictions is based on a comparative study with relevant experimental data. The validated models are then employed to investigate the effect of various parameters on the exhibited response and are used to identify the reasons that trigger the experimentally and numerically observed change in structural behaviour under high loading rates (compared to that established under static loading). On the basis of the predictions obtained from the FE analysis a new graphical method was developed, based on building complementary diagrams, for the effective derivation of Pressure-Impulse (P-I) diagrams. This method aims to overcome the problems associated with their inherent sensitivity to any change in the state of the analysed structural system. Through the combined use of the validated FE model and the proposed graphical method, P-I diagrams and the associated complementary diagrams are presented and the efficiency and applicability of the methodology is demonstrated.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • Heriot-Watt University
    Supervisors/Advisors
    • Cotsovos, D, Supervisor, External person
    • Val, D, Supervisor, External person
    • Lu, Y, Supervisor, External person
    Thesis sponsors
    Award date31 Jan 2017
    Publication statusPublished - 2017

    Fingerprint

    Reinforced concrete
    Concretes
    Forms (concrete)
    Numerical models
    Mechanics
    Compaction
    Cracks
    Finite element method

    Cite this

    @phdthesis{100dedcd62d646f282eddcc1b2138f9a,
    title = "Assessing the behaviour of reinforced concrete columns under blast loads",
    abstract = "This thesis is concerned with the numerical investigation of the structural response of reinforced concrete columns under blast loads, by means of dynamic nonlinear finite element analysis. This study provides an in depth understanding of the mechanics underlying reinforced concrete structural response under blast loading and studying the effect of certain important design parameters on the exhibited behaviour. The numerical investigation was carried out through the use of a well-established commercial finite element package (Abaqus) and employed a numerical model capable of accounting for the brittle nature of concrete. The latter model forms an extension to the ‘brittle crack’ model (already available in Abaqus) and was developed in order to overcome the shortcomings of the existing concrete model in describing concrete material behaviour in compression. The verification of the validity of the numerical predictions is based on a comparative study with relevant experimental data. The validated models are then employed to investigate the effect of various parameters on the exhibited response and are used to identify the reasons that trigger the experimentally and numerically observed change in structural behaviour under high loading rates (compared to that established under static loading). On the basis of the predictions obtained from the FE analysis a new graphical method was developed, based on building complementary diagrams, for the effective derivation of Pressure-Impulse (P-I) diagrams. This method aims to overcome the problems associated with their inherent sensitivity to any change in the state of the analysed structural system. Through the combined use of the validated FE model and the proposed graphical method, P-I diagrams and the associated complementary diagrams are presented and the efficiency and applicability of the methodology is demonstrated.",
    author = "Margalite Vilnay",
    year = "2017",
    language = "English",
    school = "Heriot-Watt University",

    }

    Vilnay, M 2017, 'Assessing the behaviour of reinforced concrete columns under blast loads', Doctor of Philosophy, Heriot-Watt University.

    Assessing the behaviour of reinforced concrete columns under blast loads. / Vilnay, Margalite.

    2017. 295 p.

    Research output: ThesisDoctoral Thesis

    TY - THES

    T1 - Assessing the behaviour of reinforced concrete columns under blast loads

    AU - Vilnay, Margalite

    PY - 2017

    Y1 - 2017

    N2 - This thesis is concerned with the numerical investigation of the structural response of reinforced concrete columns under blast loads, by means of dynamic nonlinear finite element analysis. This study provides an in depth understanding of the mechanics underlying reinforced concrete structural response under blast loading and studying the effect of certain important design parameters on the exhibited behaviour. The numerical investigation was carried out through the use of a well-established commercial finite element package (Abaqus) and employed a numerical model capable of accounting for the brittle nature of concrete. The latter model forms an extension to the ‘brittle crack’ model (already available in Abaqus) and was developed in order to overcome the shortcomings of the existing concrete model in describing concrete material behaviour in compression. The verification of the validity of the numerical predictions is based on a comparative study with relevant experimental data. The validated models are then employed to investigate the effect of various parameters on the exhibited response and are used to identify the reasons that trigger the experimentally and numerically observed change in structural behaviour under high loading rates (compared to that established under static loading). On the basis of the predictions obtained from the FE analysis a new graphical method was developed, based on building complementary diagrams, for the effective derivation of Pressure-Impulse (P-I) diagrams. This method aims to overcome the problems associated with their inherent sensitivity to any change in the state of the analysed structural system. Through the combined use of the validated FE model and the proposed graphical method, P-I diagrams and the associated complementary diagrams are presented and the efficiency and applicability of the methodology is demonstrated.

    AB - This thesis is concerned with the numerical investigation of the structural response of reinforced concrete columns under blast loads, by means of dynamic nonlinear finite element analysis. This study provides an in depth understanding of the mechanics underlying reinforced concrete structural response under blast loading and studying the effect of certain important design parameters on the exhibited behaviour. The numerical investigation was carried out through the use of a well-established commercial finite element package (Abaqus) and employed a numerical model capable of accounting for the brittle nature of concrete. The latter model forms an extension to the ‘brittle crack’ model (already available in Abaqus) and was developed in order to overcome the shortcomings of the existing concrete model in describing concrete material behaviour in compression. The verification of the validity of the numerical predictions is based on a comparative study with relevant experimental data. The validated models are then employed to investigate the effect of various parameters on the exhibited response and are used to identify the reasons that trigger the experimentally and numerically observed change in structural behaviour under high loading rates (compared to that established under static loading). On the basis of the predictions obtained from the FE analysis a new graphical method was developed, based on building complementary diagrams, for the effective derivation of Pressure-Impulse (P-I) diagrams. This method aims to overcome the problems associated with their inherent sensitivity to any change in the state of the analysed structural system. Through the combined use of the validated FE model and the proposed graphical method, P-I diagrams and the associated complementary diagrams are presented and the efficiency and applicability of the methodology is demonstrated.

    M3 - Doctoral Thesis

    ER -