Seismic Fragility Assessment of Steel Liquid Storage Tanks

Bakalis, Konstantinos; Vamvatsikos, Dimitrios; Fragiadakis, Michalis

doi:10.1115/pvp2015-45370

Cited by 15 publications

(10 citation statements)

References 8 publications

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“…where P(C|IM � x) is the probability that a ground motion with IM � x will lead to structural collapse, V denotes the standard normal CDF, θ is the median of the fragility function and β is the standard deviation of lnθ. Regarding the selection of IM, the PGA is a valid choice for liquid storage tanks due to the impulsive load pattern [20,33,34].…”

Section: Fragility Function Evaluationmentioning

confidence: 99%

Seismic Vulnerability Assessment of Liquid Storage Tanks Isolated by Sliding-Based Systems

Tsipianitis

Tsompanakis

2018

Advances in Civil Engineering

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Liquid-filled tanks are effective storage infrastructure for water, oil, and liquefied natural gas (LNG). Many such large-scale tanks are located in regions with high seismicity. erefore, very frequently base isolation technology has to be adopted to reduce the dynamic distress of storage tanks, preventing the structure from typical modes of failure, such as elephant-foot buckling, diamond-shaped buckling, and roof damage caused by liquid sloshing. e cost-effective seismic design of base-isolated liquid storage tanks can be achieved by adopting performance-based design (PBD) principles. In this work, the focus is given on slidingbased systems, namely, single friction pendulum bearings (SFPBs), triple friction pendulum bearings (TFPBs), and mainly on the recently developed quintuple friction pendulum bearings (QFPBs). More specifically, the study is focused on the fragility analysis of tanks isolated by sliding-bearings, emphasizing on isolators' displacements due to near-fault earthquakes. In addition, a surrogate model has been developed for simulating the dynamic response of the superstructure (tank and liquid content) to achieve an optimal balance between computational efficiency and accuracy.

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Section: Fragility Function Evaluationmentioning

confidence: 99%

Seismic Vulnerability Assessment of Liquid Storage Tanks Isolated by Sliding-Based Systems

Tsipianitis

Tsompanakis

2018

Advances in Civil Engineering

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“…Rupturing either the bottom layers of the tank wall or the base plate is expected to trigger uncontrolled loss of the stored material, with all the associated consequences considered. Recently, Bakalis et al [16] developed a performance-based assessment methodology for atmospheric steel liquid storage tanks. The PBEE framework considers three damage states of increasing severity, namely minor (DS1), severe without leakage (DS2) and loss of containment (DS3).…”

Section: Performance Objectivesmentioning

confidence: 99%

“…Using the aforementioned expressions, record-to-record variability can be incorporated explicitly, while limit-state capacity uncertainties can also be included for a structural system that can adequately be approximated by a SDOF oscillator. The aforementioned procedure finds application for the case of liquid storage tanks when a model similar to the one developed by Bakalis et al [15,16] is used. Following a Static Pushover analysis performed on the full tank model, a bilinear idealisation of the system's performance is necessary to obtain the yield point (δy, Vby).…”

Section: Fragility Curves Based On Static Pushover Analysismentioning

confidence: 99%

“…Figure 10 presents the seismic fragility evaluation based on the simplified procedure outlined above. Fragility curves are provided for all local damage states given in Table 2, and a comparison with the IDA-based assessment procedure discussed by Bakalis et al [16] is performed in view of evaluating the proposed SPO-based methodology. It appears that fragility curves are in good agreement for the sloshing and plastic rotation damage states, although minor discrepancies exist throughout the intensity considered, that can be attributed to the fitting procedure of the cumulative distribution function.…”

Section: Fragility Curves Based On Static Pushover Analysismentioning

confidence: 99%

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Surrogate Modelling of Liquid Storage Tanks for Seismic Performance Design and Assessment

Bakalis¹,

Fragiadakis²,

Vamvatsikos³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The finite element method (FEM) is often employed to create detailed models for the seismic assessment and design of liquid storage tanks. This comprehensive approach offers accuracy, which is counterbalanced however by its computational inefficiency, especially for the case of large-scale engineering problems. Regardless of the continuous evolution of computer technology, surrogate models are necessary when such problems of engineering practice are encountered. This study, attempts to develop an appropriate surrogate modelling approach, tailored for the design and seismic risk assessment of liquid storage tanks. A formulation that disregards fluid-structure-interaction is employed in view of providing a reasonable compromise between modelling complexity and error. At the same time, a simplified methodology based on nonlinear static procedures is proposed for the assessment of atmospheric tanks. The comparison with Incremental Dynamic Analysis reveals a reasonable, yet conservative in some cases, match for the damage states considered, thus offering an alternative methodology that may easily be incorporated within code-based provisions.

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“…[8]- [10]) due to their computational simplicity but most disregard the influence of floating roofs. For example, a procedure for estimating the seismic vulnerability of tank farms was introduced in [11]. Although the tanks investigated in [11] were equipped with floating roofs, roof failure modes were neglected.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of a floating roof in an unanchored broad storage tank: Experimental tests and numerical simulations

Caprinozzi

Paolacci

Bursi

et al. 2021

Journal of Fluids and Structures

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Liquid steel storage tanks equipped with floating roofs are critical components of industrial facilities because they often store hazardous material. In the past, major earthquakes have caused large vertical displacements of floating roofs. Consequently, roof failure and/or content loss has occurred, which has seriously endangered the surrounding environment and community. Therefore, research interest in this topic remains high, giving rise to experimental campaigns and investigatory studies concerning both design and assessment approaches. Along these lines, the first part of this paper briefly introduces a shaking table test performed on a scaled steel storage tank equipped with a floating roof. This test provided useful experimental data about the vertical displacement histories of floating roofs subject to seismic loading. Subsequently, a simplified model and a refined finite element model aimed at simulating the shaking table test program are introduced and described. Relevant experimental and numerical outcomes are then presented and discussed. Finally, we performed a parametric study related to the simplified model to highlight the most relevant parameters involved. It is shown that both the refined finite element model and the simplified model were capable of simulating the roof vertical displacement histories observed in the shaking table test. The former model has higher fidelity but appears to be excessively time-consuming, whilst the latter is more suitable for risk assessment purposes.

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Seismic Fragility Assessment of Steel Liquid Storage Tanks

Cited by 15 publications

References 8 publications

Seismic Vulnerability Assessment of Liquid Storage Tanks Isolated by Sliding-Based Systems

Seismic Vulnerability Assessment of Liquid Storage Tanks Isolated by Sliding-Based Systems

Surrogate Modelling of Liquid Storage Tanks for Seismic Performance Design and Assessment

Seismic performance of a floating roof in an unanchored broad storage tank: Experimental tests and numerical simulations

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