Seismic response analysis of a piping system subjected to multiple support excitations in a base isolated NPP building

Surh, Han-Bum; Ryu, Tae-Young; Park, Jin-Sung; Ahn, Eun-Woo; Choi, Chul-Sun; Koo, Ja Choon; Choi, Jae‐Boong; Kim, Moon Ki

doi:10.1016/j.nucengdes.2015.06.013

Cited by 17 publications

(4 citation statements)

References 11 publications

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“…For investigating, the more realistic effect of the fluid solid interaction effect of piping coupled with acid storage tank under earthquake load acceleration time history is performed (Surh et al, 2015), time history analysis provides generally whole response of the system and give results of stresses that contain inertial and movement effects which can be utilized for safe design. For transient time history analysis Kocaeli earthquake having a magnitude of 7.4 is applied (Sezen and Whittaker, 2004), about forty percent of heavy industry in Turkey was concentrated in this region affected by this earthquake.…”

Section: Seismic Input Modellingmentioning

confidence: 99%

Nonlinear response of acid storage tank coupled with piping attachment under seismic load for optimal safe design

Joya

Hyder

Zulfiqar

2021

Lat. Am. j. solids struct.

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Optimum safe design through numerically investigation and simulation of FSI due to seismic loading on acid tank with piping attachment is presented. A nonlinear FSI based on the FEM is performed on a full-scale 3D model. Investigations are supplemented by a CFD to simulate the fluid motion inside the tank using acceleration time history of Kocaeli earthquake, the response of the maximum stress, deformation, and displacement of rigidly restrained fixed and flexible tanks at different fill levels and thickness are evaluated. The results are compared and analyzed with design codes and the difference observed in hydrostatic pressure is less than 0.08%, and in maximum values of hydrodynamic pressure are less than 4.3%, 0.8%, and 1.5% at three fill level while the average difference in transient time history total pressure is less than 0.4%. Finally, the provision given in the design codes and response of parameters is computed and polynomial correlation is proposed with an accuracy of above 0.99 and average difference less than 5% in fixed tank and less than 2% in the flexible tank for designing a safe tank by analysis.

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Section: Seismic Input Modellingmentioning

confidence: 99%

Nonlinear response of acid storage tank coupled with piping attachment under seismic load for optimal safe design

Joya

Hyder

Zulfiqar

2021

Lat. Am. j. solids struct.

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“…To-date, it still remains to be examined the dynamic interaction between a supporting structure and a piping system towards highlighting the most critical design challenges and preventing accidents in the future that put human lives and environment at risk. To the best of our knowledge, the research is rather limited on this topic; the majority of research has focused on the analysis of piping system or critical components individually ( [5] & [16] among others), whereas the analysis of the combined models (supporting structure and piping) is rather obscure. An interesting research upon the effects of dynamic interaction on pipe-way and piping system response by considering different weight ratio, diameters and end-condition of pipes as well as thickness of U-ring elements (they are used to capture the pipes along the perimeter restraining only the movement in vertical and transverse direction) was conducted in [17].…”

Section: Previous Studiesmentioning

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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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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“…In order to secure the seismic safety of the interface piping system, its seismic performance must be verified, because the occurrence of a large relative displacement is expected [27][28][29]. In general, the interface piping system consists of straight pipes and fittings (elbows and tees).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Limit State of a Six-Inch Carbon Steel Pipe Elbow in Base-Isolated Nuclear Power Plants

et al. 2021

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The installation of base isolation systems in nuclear power plants can improve their safety from seismic loads. However, nuclear power plants with base isolation systems experience greater displacement as they handle seismic loads. The increase in relative displacement is caused by the installed base isolation systems, which increase the seismic risk of the interface piping system. It was found that the failure mode of the interface piping system was low-cycle fatigue failure accompanied by ratcheting, and the fittings (elbows and tees) failed due to the concentration of nonlinear behavior. Therefore, in this study, the limit state was defined as leakage, and an in-plane cyclic loading test was conducted in order to quantitatively express the failure criteria for the SCH40 6-inch carbon steel pipe elbow due to low-cycle fatigue failure. The leakage line and low-cycle fatigue curves of the SCH40 6-inch carbon steel pipe elbow were presented based on the test results. In addition, the limit state was quantitatively expressed using the damage index, based on the combination of ductility and energy dissipation. The average values of the damage index for the 6-inch pipe elbow calculated using the force−displacement (P–D) and moment−relative deformation angle (M–R) relationships were found to be 10.91 and 11.27, respectively.

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Seismic response analysis of a piping system subjected to multiple support excitations in a base isolated NPP building

Cited by 17 publications

References 11 publications

Nonlinear response of acid storage tank coupled with piping attachment under seismic load for optimal safe design

Nonlinear response of acid storage tank coupled with piping attachment under seismic load for optimal safe design

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

Evaluation of the Limit State of a Six-Inch Carbon Steel Pipe Elbow in Base-Isolated Nuclear Power Plants

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