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Atmospheric Tanks

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Marta D'amico – One of the best experts on this subject based on the ideXlab platform.

  • Observational Seismic Fragility Curves for Steel Cylindrical Tanks
    Journal of Pressure Vessel Technology-transactions of The Asme, 2018
    Co-Authors: Marta D'amico, Nicola Buratti

    Abstract:

    The evaluation of seismic vulnerability of Atmospheric above ground steel storage Tanks is a fundamental topic in the context of industrial safety. Depending on the shell portion affected, on the extent of damage, and on toxicity, flammability, and reactivity of stored substances, liquid leakages can trigger hazardous chains of events whose consequences affect not only the plant but also the surrounding environment. In light of that, the study proposed herein provides an analysis of the seismic fragility of cylindrical above ground storage Tanks based on observational damage data. The first phase of this work has consisted in collecting a large empirical dataset of information on failures of Atmospheric Tanks during past earthquakes. Two sets of damage states have then been used in order to characterize the severity of damage and the intensity of liquid releases. Empirical fragility curves have been fitted by using Bayesian regression. The advantage of this approach is that it is well suited to treat direct and indirect information obtained from field observations and to incorporate subjective engineering judgement. Different models have been employed in order to investigate the effects of tank aspect ratio, filling level, and base anchorage. Moreover, the effects of interaction between these critical aspects are included in fragility analysis. The hazard parameter used is the peak ground acceleration (PGA). Seismic fragility curves obtained from the described procedure are compared to those available in the technical literature.

  • Seismic fragility and dynamic behavior of Atmospheric cylindrical steel Tanks
    , 2018
    Co-Authors: Marta D'amico

    Abstract:

    The main purpose of the research carried out in the aim of this PhD dissertation has been the analysis of the dynamic behavior of on-grade cylindrical steel storage Tanks. This has been done through two main research fields: the evaluation of tank seismic fragility and the analytical modeling of the tank dynamics when subjected to the ground acceleration.
    In the first part of the study, new fragility models have been proposed with the aim to overcome limits and week points of past researches. For this purpose, a large dataset of information on failures of Atmospheric Tanks during past earthquakes has been collected. Two sets of Damage States have then been used in order to characterize the severity of damage and the intensity of liquid releases. Empirical fragility curves have been fitted by using Bayesian regression. Different generalized linear models have been employed in order to investigate the effects of tank aspect ratio, filling level and base anchorage. Moreover, the effects of the interaction between these critical aspects is included in fragility analysis. The second section of the present PhD study has focused on the mechanical modeling of unanchored Tanks dynamic. An investigation on inertial and centrifugal forces in the context of the interaction between tank rocking and translational motions is proposed. The simultaneous dynamic equations of a 2DOF model have been solved through a numerical software and results have been compared with those of experimental tests. Moreover, employing the dynamic properties governing the tank rocking-bulging motion into the 2DOF model equations, a simplified method to determine the tank bulging response and the measure in which it is reduced by the rocking appearance is provided. Validation of the proposed analysis is conducted comparing its results with those computed through an Explicit Finite Element Analysis on a sample tank.

Nicola Buratti – One of the best experts on this subject based on the ideXlab platform.

  • Observational Seismic Fragility Curves for Steel Cylindrical Tanks
    Journal of Pressure Vessel Technology-transactions of The Asme, 2018
    Co-Authors: Marta D'amico, Nicola Buratti

    Abstract:

    The evaluation of seismic vulnerability of Atmospheric above ground steel storage Tanks is a fundamental topic in the context of industrial safety. Depending on the shell portion affected, on the extent of damage, and on toxicity, flammability, and reactivity of stored substances, liquid leakages can trigger hazardous chains of events whose consequences affect not only the plant but also the surrounding environment. In light of that, the study proposed herein provides an analysis of the seismic fragility of cylindrical above ground storage Tanks based on observational damage data. The first phase of this work has consisted in collecting a large empirical dataset of information on failures of Atmospheric Tanks during past earthquakes. Two sets of damage states have then been used in order to characterize the severity of damage and the intensity of liquid releases. Empirical fragility curves have been fitted by using Bayesian regression. The advantage of this approach is that it is well suited to treat direct and indirect information obtained from field observations and to incorporate subjective engineering judgement. Different models have been employed in order to investigate the effects of tank aspect ratio, filling level, and base anchorage. Moreover, the effects of interaction between these critical aspects are included in fragility analysis. The hazard parameter used is the peak ground acceleration (PGA). Seismic fragility curves obtained from the described procedure are compared to those available in the technical literature.

Buratti Nicola – One of the best experts on this subject based on the ideXlab platform.

  • Observational Seismic Fragility Curves For Atmospheric On-Grade Steel Storage Tanks Based On Damage States In Terms Of Structural Performance And Release Of Content
    , 2018
    Co-Authors: D'amico Marta, Buratti Nicola

    Abstract:

    The evaluation of the seismic vulnerability of Atmospheric on-grade steel storage Tanks is a fundamental topic in the context of industrial safety. In process plants, areas assigned to the storage of liquid products are among the most critical because of the presence of huge volumes of dangerous substances. On the other hand, official post-earthquake reports reveal that thin steel shell structures of which usually liquid storage Tanks are made have suffered several type of failures. Depending on the shell portion affected, on the extent of damage and on toxicity, flammability and reactivity of stored substances, liquid leakages can trigger hazardous chains of events whose consequences affect not only the plant but also the surrounding environment. In the light of that, the study proposed herein provides an analysis of the seismic fragility of cylindrical on-grade storage Tanks, based on observational damage data. The first phase of this work has consisted in collecting a large empirical dataset of information on failures of Atmospheric Tanks during past earthquakes. Two sets of Damage States have then been used in order to characterize the severity of damage and the intensity of liquid releases. From a statistic analysis of the collected data, empirical fragility curves has been fitted by using Bayesian regression. The advantage of this approach is that it is well suited to treat direct and indirect information obtained from field observations and to incorporate subjective engineering judgement since it can take into account statistical and model uncertainties. The hazard parameter used for tank fragilities is the Peak Ground Acceleration. Seismic fragility curves obtained from the described procedure are compared to those available in the technical literature. Finally, the influence of tank size, filling level and presence of anchorage on the tank performance have been investigated