Impact of the excitation frequencies on wall stresses in a storage tank

Hernandez‐Hernandez, Diego; Larkin, Tam; Chouw, Nawawi

doi:10.1016/j.engstruct.2021.112775

Cited by 6 publications

(5 citation statements)

References 37 publications

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“…Equation ( 10) is the mathematical definition of a Ricker wavelet. However, because the initial and final movements of the shake table must be performed smoothly, that is, rapid change in velocity is not desirable, Ricker wavelets are then contracted by the continuous one-dimension wavelet transform defined by Equation (11), which essentially provides a smooth ramp of amplification and attenuation.…”

Section: Ricker Wavelet Excitationsmentioning

confidence: 99%

“…These are, among others: The interaction between the fluid and tank wall (fluid‐structure interaction FSI), which determines the sloshing behavior, see for example 6,7 The transient partial separation (uplift) of the tank from the support base 8–12 The characteristics of the seismic excitation, for example, frequency content, amplitude, and duration 13–16 …”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the adequacy of a spring‐mass model in analyses of liquid sloshing in anchored storage tanks

Hernandez‐Hernandez

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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This research addresses the influence of the load characteristics, that is, frequency content and maximum acceleration, on the wall stresses of an anchored water storage tank. A low-density polyethylene tank with a range of six different aspect ratios (water height to tank radius) was tested using a shake table. Eight sine excitations that cover the lowest free vibration frequency of the tank-water system were applied. Additionally, two sets of five Ricker wavelet excitations were utilized. Each set represents potential earthquakes with a bandwidth between a low and a high dominant frequency. The experimentally determined maximum stresses and those obtained from calculations using a common spring-mass model employed for seismic analysis of tanks were compared. The results reveal that the relationship between the excitation frequency and the wall stresses strongly depends on the sloshing behavior, especially when the frequency of loading is in the vicinity of the lowest freevibration frequency of the tank-water system. When the frequencies are dissimilar, there is a proportional relationship between stress and the maximum acceleration of the excitation. The spring-mass model was found to underestimate both the maximum hoop stress (for aspect ratios greater than two) and axial stress (for aspect ratios equal to 0.5). This occurs because is the spring-mass model cannot capture, in all cases, the contribution of chaotic sloshing to wall stress.

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Section: Ricker Wavelet Excitationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the adequacy of a spring‐mass model in analyses of liquid sloshing in anchored storage tanks

Hernandez‐Hernandez

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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“…The nonlinear behaviour depends on, for example the aspect ratio, the excitation characteristics, the presence of a lid and the supporting medium stiffness. 43 A 'strong excitation' is here defined as that leading to a sloshing pattern that involves a transition from a planar pattern to a nonplanar, or eventually a chaotic liquid motion, that is the water surface breaks. If the pattern change does not eventuate, then the excitation is defined as weak.…”

Section: Introductionmentioning

confidence: 99%

“…This spring‐mass model is a simplified approach that cannot capture FSI due to the innate nonlinear behaviour of sloshing. The nonlinear behaviour depends on, for example the aspect ratio, the excitation characteristics, the presence of a lid and the supporting medium stiffness 43 …”

Section: Introductionmentioning

confidence: 99%

“…The transformation of a sloshing pattern from planar to nonplanar and eventually to chaotic has been observed in physical experiments, for example Refs. 43–45 Physical obstructions used as a barrier have been implemented to retain a planar sloshing pattern, for example rigid and flexible baffles in the horizontal and vertical planes, floating roofs and mats. The effects of rigid and flexible baffles on the tank response had been investigated theoretically and experimentally, for example Refs.…”

Section: Introductionmentioning

confidence: 99%

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Lid induced sloshing suppression and evaluation of wall stresses in a liquid storage tank including seismic soil‐structure interaction

Hernandez‐Hernandez

Larkin

Chouw

2022

Earthq Engng Struct Dyn

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Aboveground liquid storage tanks are often found on weak compressive soil due to their proximity to harbours and rivers. These soil conditions lead to a high probability of significant soil‐structure interaction (SSI) under earthquake loading. In strong earthquakes, the transient partial separation of the tank base from the supporting medium (uplift) and chaotic liquid sloshing often cause damage to the tank wall. This experimental research determines the simultaneous effects of SSI and the restriction of sloshing on the development of hoop and axial stresses in the tank wall. A low‐density polyethylene tank with two different supporting foundation conditions, that is rigid and flexible, was tested using a shake table. A high‐density foam floating lid was utilised as a barrier to the development of sloshing enabling evaluation of the contribution of sloshing to wall stress development. The maximum experimentally determined stresses are compared with those from a nonlinear elastic spring‐mass model. The results reveal that a flexible supporting medium reduces the development of stresses by increasing the occurrence of uplift compared to that when the tank lies on a rigid supporting medium. Furthermore, restricting chaotic sloshing decreases both the maximum stress and uplift. The spring‐mass model predicts the maximum stresses with more accuracy when the tank is on a flexible than on a rigid supporting medium.

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Seismic Vulnerability Assessment of an Unanchored Circular Storage Tank Against Elephant’s Foot Buckling

Bektaş

Aktaş

2022

J. Vib. Eng. Technol.

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Impact of the excitation frequencies on wall stresses in a storage tank

Cited by 6 publications

References 37 publications

Evaluation of the adequacy of a spring‐mass model in analyses of liquid sloshing in anchored storage tanks

Evaluation of the adequacy of a spring‐mass model in analyses of liquid sloshing in anchored storage tanks

Lid induced sloshing suppression and evaluation of wall stresses in a liquid storage tank including seismic soil‐structure interaction

Seismic Vulnerability Assessment of an Unanchored Circular Storage Tank Against Elephant’s Foot Buckling

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