Seismic Analysis of a Large LNG Tank considering the Effect of Liquid Volume

Zhao, Yi; Li, Hong‐Nan; Fu, Xing; Zhang, Shuocheng; Mercan, Oya

doi:10.1155/2020/8889055

Cited by 8 publications

(12 citation statements)

References 25 publications

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“…Zhao et al They used the Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) algorithm, a less computational algorithm, to simulate liquefied natural gas (LNG) tanks. They stated that the Von Mises tension increased at the bottom of the tank, and that strong earthquakes could seriously compromise the structural integrity of large LNG tanks [22]. In this present study, by observing the sample responses such as acceleration and deformation of the tested models, the results were compared and confirmed with previous studies.…”

Section: Introductionsupporting

confidence: 81%

Seismic Analysis Of Oil Storage Tanks With Different Geometries

2024

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Oil storage tanks must be designed to withstand dynamic and seismic loads. It is very important to ensure the safety of oil tanks with large volumes under earthquakes. During the earthquake, the land surface moves in all directions and as a result, the tank is exposed to vibrations. Especially the movements parallel to the land surface create vibrations in the tank and cause unexpected deformations on the tank walls. In this study, possible deformations that may occur in oil tanks with three different geometries under seismic conditions are investigated depending on their filling ratios. In the study, a package program based on the finite element method was used. By observing the sample responses such as acceleration and deformation of the tested models, the results were compared and confirmed with previous studies. The results revealed a clear relationship between oil level, tank shape and mode change. The higher oil level offered higher natural frequency in any case. The response spectrum model observed an increase when the oil level increased.

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Section: Introductionsupporting

confidence: 81%

Seismic Analysis Of Oil Storage Tanks With Different Geometries

2024

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“…Therefore, the seismic safety of LNG tanks gains much attention. [1][2][3][4] Ground supported cylindrical tanks are one of commonly used types of tanks, which are without anchorage sometimes in order to realize the economical factor of the structures. When the overturning moment caused by the horizontal earthquake exceeds the restoring moment resulted from self-weight, the tank is lifted from the base.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of column supported tanks considering uplift effect and soil‐structure interaction

Liu

Zhao

Zhou

2023

Earthq Engng Struct Dyn

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In this paper, the seismic responses of column supported tanks under horizontal earthquake are obtained by finite element method. Two types of structures are discussed including the anchored tank with columns fixed on the ground and the resilient tank whose columns can uplift. The uplift effect is realized by the contact algorithm to allow the column move upwards in a vertical direction and the soil‐structure interaction (SSI) is considered by equivalent soil springs. Different soil types and hard ground condition are adopted to study SSI effect on natural frequencies of tanks and seismic responses of the anchored tank, as well as coupling effect (both uplift and SSI effects) on seismic responses of the resilient tank. The structural displacement and acceleration, the stress of tank walls and columns, the base shear and the overturning moment, the uplift displacement of columns are discussed. The results of tanks in different conditions are compared with each other, which show that SSI has a significant impact on seismic responses of column supported tanks. As the stiffness of soil decreases, the tank has larger displacement, smaller natural frequency, and stress level of structural members especially when it is sited on softer soil type. Compared to the anchored tank, due to the combination of both uplift effect and foundation deformation, the resilient tank has smaller displacement to prevent its overall collapse and lower responses such as the base shear and the overturning moment. The resilient tank has better seismic performances regardless of soil conditions.

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“…Different types of impact damage were identified according to dynamic response results such as stress, energy, displacement, and critical impact velocity. Zhang et al [15] investigated the effect of the multi-directional components of ground motion on an unanchored steel storage tank. They concluded that the vertical seismic component produced high compressive axial stress, which caused a significant increase in uplift and sliding at the tank bottom.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the vertical seismic component produced high compressive axial stress, which caused a significant increase in uplift and sliding at the tank bottom. Zhao et al [15] applied an accurate and efficient Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) algorithm to evaluate the seismic response of a 160,000 m 3 LNG prestressed storage tank at different liquid levels. The maximum stress of the inner tank with 100% LNG liquid level exceeded 500 MPa under the selected seismic waves and raised concerns for its structural safety.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Analysis of a Large LNG Tank Considering Different Site Conditions

Zhao

Zhang

et al. 2020

Applied Sciences

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Seismic resilience of critical infrastructure, such as liquefied natural gas (LNG) storage tanks, is essential to the safety and economic well-being of the general public. This paper studies the effect of different ground motions on large LNG storage tanks under four different site conditions. Key parameters of structural design and dynamic analysis, including von Mises stress of outer and inner tanks, tip displacement, and base shear, are analyzed to directly evaluate the safety performance of the large LNG tanks. Because the size of an LNG tank is too large to perform any experiments on a physical prototype, Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) simulation is used as a feasible and efficient method to predict its seismic response. First, the accuracy of the SPH-FEM method is verified by comparing sloshing frequencies obtained from theoretical formulation to experimental results and SPH-FEM models. Then, the seismic response of a real-life 160,000 m3 LNG prestressed storage tank is evaluated with different liquid depths under four site classes. Simulation results show that the tip displacements of the LNG tank at liquid levels of 25% and 50% under site class IV are nearly identical to that of 75% and 100% under site class II. In addition, the maximum von Mises stress of the inner tanks exceeds 500 MPa in all four site classes and jeopardizes the structural integrity of large LNG tanks. As a result, optimization of structural design and the establishment of an early warning system are imperative to the safety of LNG tanks at high liquid levels.

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Seismic Analysis of a Large LNG Tank considering the Effect of Liquid Volume

Cited by 8 publications

References 25 publications

Seismic Analysis Of Oil Storage Tanks With Different Geometries

Seismic Analysis Of Oil Storage Tanks With Different Geometries

Seismic response of column supported tanks considering uplift effect and soil‐structure interaction

Seismic Analysis of a Large LNG Tank Considering Different Site Conditions

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