Seismic fragility assessment of high-rise stacks in oil refineries

Karaferis, N. D.; Kazantzi, Athanasia K.; Melissianos, Vasileios E.; Bakalis, Konstantinos; Vamvatsikos, Dimitrios

doi:10.1007/s10518-022-01472-2

Cited by 4 publications

(2 citation statements)

References 62 publications

(53 reference statements)

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“…A 3D elastic model of the RC building was developed and subjected to a suite of 30 "ordinary" (i.e., non-pulse-like, non-long-duration) natural ground motion records, which were selected by on the basis of the geometric mean of spectra acceleration ordinates between 0.1 s and 1.0 s, AvgS a (0.1−1 s) . More details on the record selection process can be found in the study of Karaferis et al (2022). The ground motion spectra of the selected motions are presented in Figs.…”

Section: Case Studymentioning

confidence: 99%

Acceleration-sensitive ancillary elements in industrial facilities: alternative seismic design approaches in the new Eurocode

Kazantzi

Karaferis

Melissianos

et al. 2023

Bull Earthquake Eng

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The Eurocode 8—Part 4 approaches, per their December 2022 update, are presented for the design of acceleration-sensitive industrial ancillary components. The seismic performance of such nested and/or supported ancillary elements, namely mechanical and electrical equipment, machinery, vessels, etc. is critical for the safety and operability of an industrial facility in the aftermath of an earthquake. Of primary importance are the structural characteristics of the supporting structure and the supported component, pertaining to resonance, strength, and ductility, and whether these are known (and to what degree) during initial design and/or subsequent modifications and upgrades. Depending on the availability and reliability of information on the overall system, the Eurocode methods comprise (a) a detailed component/structure-specific design accounting for all pertinent component and building characteristics, equivalent to typical building design per Eurocode 8—Part 1–2, (b) a conservative approach where a blanket safety factor is applied when little or no such data is available, and (c) a ductile design founded on the novel concept of inserting a fuse of verified ductility and strength in the load path between the supporting structure and the ancillary element. All three methods are evaluated and compared on the basis of a case-study industrial structure, showing how an engineer can achieve economy without compromising safety under different levels of uncertainty.

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Section: Case Studymentioning

confidence: 99%

Acceleration-sensitive ancillary elements in industrial facilities: alternative seismic design approaches in the new Eurocode

Kazantzi

Karaferis

Melissianos

et al. 2023

Bull Earthquake Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Within the re nery facilities there are largescale building structures, which are mainly used to support bulky mechanical equipment and long pipelines. Among such structures are high-rise stacks [7][8][9] and tall frames, made of reinforced concrete (RC) or steel. The latter support catalytic reactors and in many cases, are constructed as vertically mixed structures, i.e., RC frames are constructed up to some elevation and steel braced frames continue.…”

Section: Introductionmentioning

confidence: 99%

Seismic behaviour and design of a tall mixed steel-reinforced concrete structure supporting an oil refinery reactor

Radaiou,

Skalomenos,

Papagiannopoulos

2023

Preprint

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This study investigates the seismic behaviour of a special mixed steel-reinforced concrete structure that supports an oil refinery reactor. The structure is 64.90 m tall and consists of three parts: (a) a concrete frame basement; (b) a steel braced frame that supports the oil reactor and (c) the steel reactor itself. A three-dimensional model of the structure is created to perform static non-linear (pushover) analyses in order to obtain the capacity curves and understand the overall inelastic behavior of the structure. The results of the pushover analysis reveal that the structure exhibits similar inelastic behavior in both horizontal directions and satisfy the capacity design principles. The structure shows limited ductility considering the fact that has been designed with a behavior factor of q = 1.5 and primary damages are expected mainly in concrete members. Subsequently, dynamic non-linear time-history (NLTH) analyses are performed utilizing the three translational components of three seismic motions recorded during past earthquakes. These results involve: i) the maximum values for displacements, accelerations and base shears; ii) the maximum stresses at critical points of the oil refining reactor and iii) the formation of plastic hinges at columns, beams and braces of the structure. Opposite to the pushover analysis, NLTH analyses revealed that strong ground motions can lead to the development of plastic hinges that do not follow the desirable failure pattern and is likely to be related to the absence of adequate ductility-based design requirements. In case of a significant seismic event, accelerations and displacements observed are expected to cause failure of the piping and mechanical equipment, while local failures at high-stress areas of the oil reactor is possible. Localized strengthening might be necessary to avoid repair works and downtime after strong seismic events.

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Mechanical modeling, seismic fragility, and correlation issues for groups of spherical pressure vessels

2023

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A roadmap is outlined for determining comprehensive seismic fragility curves for (single or groups of) spherical pressure vessel structures commonly found in oil refineries. The developed modeling techniques aim to strike a balance between accuracy and computational efficiency, with a focus on capturing the most pertinent failure modes relevant to these structural types. First, a set of “partial” fragilities is determined based on each vessel’s fill ratio, as the response varies substantially depending on the amount of liquid content. Considering that a seismic assessment process invariably involves simultaneous consideration of such partial fragilities, a Monte Carlo-based approach is employed for their combination. The results naturally depend on the level of correlation employed, but can be almost perfectly matched by simpler analytical methods in the edge cases of full and zero correlation.

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Seismic fragility assessment of high-rise stacks in oil refineries

Cited by 4 publications

References 62 publications

Acceleration-sensitive ancillary elements in industrial facilities: alternative seismic design approaches in the new Eurocode

Acceleration-sensitive ancillary elements in industrial facilities: alternative seismic design approaches in the new Eurocode

Seismic behaviour and design of a tall mixed steel-reinforced concrete structure supporting an oil refinery reactor

Mechanical modeling, seismic fragility, and correlation issues for groups of spherical pressure vessels

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