Performance-Based Analysis of Coupled Support Structures and Piping Systems Subject to Seismic Loading

Bursi, Oreste S.; Paolacci, Fabrizio; Reza, Shahin

doi:10.1115/pvp2015-45123

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…Although EN and AM codes of pipelines design do not make reference of shell elements yet only to beam ones, the last type of element may be incapable of capturing the exact strain-stress response [7]. In view of the large model under investigation and the availabilities of the analysis software [27] for pipe modelling, stick models both for straight and curved pipe have been used and calibrated according to [32]. It is worth mentioning that the internal operating pipe pressure is low (Pmax=1.63 MPa) as quoted in [30] and thus neglected in order to remain on the safe side since the pressure increases at low operating levels the bending stiffness of pipe bends ( [32]).…”

Section: Model Descriptionmentioning

confidence: 99%

“…In view of the large model under investigation and the availabilities of the analysis software [27] for pipe modelling, stick models both for straight and curved pipe have been used and calibrated according to [32]. It is worth mentioning that the internal operating pipe pressure is low (Pmax=1.63 MPa) as quoted in [30] and thus neglected in order to remain on the safe side since the pressure increases at low operating levels the bending stiffness of pipe bends ( [32]). The pipelines are supported mainly in a flexible way on the rack by keeping free the displacement in the axial direction of the pipe as well as all the degrees of freedom.…”

Section: Model Descriptionmentioning

confidence: 99%

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Seismic Fragility Assessment of LNG Pipe Rack Accounting for Soil-Structure-Interaction

Sarno¹,

Karagiannakis²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The increasing momentum for Natural Gas exploitation in Europe and worldwide constitutes Liquified Gas terminals indispensable links of energy supply network. Infrastructures of this kind should be resilient against the earthquake hazard and thus designed accounting for as much as possible sources of uncertainty such as modelling issues, analysis methods, seismic input selection, soil effects and others. To date, research efforts have not assessed the response of pipe racks sufficiently, let alone the interaction between the rack and piping system and analysis methods of the past have proved to be neither adequate nor efficient towards evaluating the earthquake hazard potentiality. Further, soil-structure-interaction has not been incorporated into a fragility analysis framework; albeit it is considered as a critical parameter since midstream and downstream facilities are usually rested on alluvial deposits. In the present work, a supporting RC rack is analysed through a 3D finite element model in the nonlinear regime both as coupled and decoupled vis-à-vis a piping system. The fragility functions are evaluated for structural components and limit states in the global and meso-scale, through the Incremental Dynamic Analysis (IDA) considering far-field conditions. In the end, the SSI is encountered accounting for linear and nonlinear soil, and soil effects are demonstrated by the fragility curves. It is inferred that the fragility of the rack soars considerably by the piping system boundary conditions in the coupled case and the SSI has detrimental impact, and thus should be accounted, particularly, for industrial structures that are located at coastal sites.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Seismic Fragility Assessment of LNG Pipe Rack Accounting for Soil-Structure-Interaction

Sarno¹,

Karagiannakis²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Probabilistic fire analyses and fragility curves become even more rare when it comes to industrial and petrochemical plants, though their piping systems mainly transport flammable material, liquid or gas fuel. Natural or accidental events may severely damage the structure supporting the piping systems [27][28][29][30][31][32], usually consisting of steel pipe-racks, and they may cause a release of flammable material from a pipe or a tank. Although in general the probability of occurrence of a fire may be low, the probability of ignition of the spilled flammable material increases in industrial environments and severe consequences are expected, as shown, among the others, by Uehara [33], Chan and Lin [34],…”

Section: Introductionmentioning

confidence: 99%

Fire Fragility Curves for Industrial Steel Pipe-Racks Integrating Demand and Capacity Uncertainties

Possidente

Randaxhe²,

Tondini

2023

Fire Technol

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This paper aims at deriving fire fragility curves for a prototype steel pipe-rack in an industrial plant subjected to localised fires. In particular, starting from a reference case study, uncertainties related to the structural capacity and the size of the localised fires caused by a hole in a tank or a hole in a pipe are included in the analyses. Thus, the influence of uncertainties in the derivation of the fragility functions was highlighted by comparing four sets of analyses in which both demand and capacity uncertainties were progressively introduced. Moreover, alongside the cloud analysis (CA), the suitability of the Multiple Stripe Analysis (MSA) to build relevant probabilistic fire demand models was assessed. Fire fragility curves were derived by considering the interstorey drift ratio (ISDR) as engineering demand parameter (EDP) and by assessing different relevant intensity measures (IMs) that represent the severity of localised fires. It was found that by introducing uncertainties in the steel yield strength, lower probabilities to exceed the life safety and the near collapse limit states with respect to the reference case study were observed. Moreover, the inclusion of further uncertainties, described with continuous physically-based probability functions of the size of the fire diameter, affected the probabilistic models by lowering the probability of exceedance. These functions provide a more realistic description of the fire scenario, enabling a better representation of the structural vulnerability. For this case study, the CA exhibited better suitability for the derivation of fire fragility curves than the MSA. All the analysis results are thoroughly discussed in the paper.

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“…Phan et al [7] analysed the seismic vulnerability of an elevated steel storage tank supported by reinforced concrete columns, by developing a probabilistic demand model. Numerous seismic analyses were performed on petrochemical piping systems and their support structure by Paolacci et al [8]- [12]. They namely considered an existing steel pipe rack as case study and delivered performance-based seismic analyses.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic fire demand model for steel pipe-racks exposed to localised fires

Randaxhe

Popa

Tondini

2021

Engineering Structures

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This paper proposes a new method to build a probabilistic fire demand model (PFDM) to investigate the structural behaviour of a steel pipe-rack located within an industrial installation and exposed to a localised fire. The PFDM will serve to develop fire fragility functions to be used either in a fire risk assessment or in a fully probabilistic structural fire engineering (PSFE) framework. The cloud analysis (CA) was exploited to build a PFDM based on different engineering demand parameters (EDP) -intensity measures (IM) pairs. In particular, the analysis was applied to a prototype steel pipe-rack integrating an industrial plant in Italy. In order to cover a wide range of plausible fire scenarios and to introduce uncertainties in the fire model, 539 fire scenarios were examined by varying the fire diameter, the fire-structure distance and the fuel. The selection of the fire diameters was based on parametric analyses quantifying liquid flow through orifices and pipes. The thermal impact of the pool fires on the structure was analysed using the LOCAFI localised fire model and the thermo-mechanical response of the pipe rack was evaluated by means of finite element analysis. Based on the structural analysis outcomes, it was found that the interstorey drift ratio (ISDR) -average heat flux impinging the structure (HFavg) EDP-IM pair was the most efficient and was also characterised the highest relative sufficiency among the other pairs. Moreover, it has to be noted that for this type of case study, the CA revealed to be a suitable and versatile tool to build a PFDM.

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Performance-Based Analysis of Coupled Support Structures and Piping Systems Subject to Seismic Loading

Cited by 8 publications

References 15 publications

Seismic Fragility Assessment of LNG Pipe Rack Accounting for Soil-Structure-Interaction

Seismic Fragility Assessment of LNG Pipe Rack Accounting for Soil-Structure-Interaction

Fire Fragility Curves for Industrial Steel Pipe-Racks Integrating Demand and Capacity Uncertainties

Probabilistic fire demand model for steel pipe-racks exposed to localised fires

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