Uplift mechanics of unanchored liquid storage tanks subjected to lateral earthquake loading

Konstantinos Bakalis; Spyros A. Karamanos

doi:10.1016/j.tws.2020.107145

Uplift mechanics of unanchored liquid storage tanks subjected to lateral earthquake loading

Konstantinos Bakalis^*, Spyros A. Karamanos

^*Corresponding author for this work

Civil Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Motivated by the seismic response of unanchored liquid storage tanks, their uplift mechanism under strong lateral loading is examined. Using three-dimensional finite element models, nonlinear static analysis is conducted to define the moment-rotation relationship of uplifting tanks resting on rigid foundation and describe the evolution of critical response parameters with increasing level of lateral loading. Meridional and hoop stress, as well as their distribution and evolution with increased uplift are computed. Comparing the numerical results with the corresponding results from anchored tanks, striking differences are observed on the values of compressive meridional stresses and their distribution around the tank circumference. Cyclic analysis, associated with repeated uplift at both sides of the tank, is also performed, to obtain the corresponding hysteretic response and verify the assumption of nonlinear-elastic tank behaviour, used in several previous works. Finally, an analytical solution is developed, capable of describing tank uplift in an efficient manner. The analytical solution accounts for the special features of uplift, obtained from the finite element solution, and can be used for simple and reliable assessment of seismic performance in unanchored liquid storage tanks.

Original language	English
Article number	107145
Number of pages	20
Journal	Thin-Walled Structures
Volume	158
Early online date	10 Oct 2020
DOIs	https://doi.org/10.1016/j.tws.2020.107145
Publication status	Published - Jan 2021

Bibliographical note

Funding Information:
This research was partially supported by a financial grant from the European Commission through the Research Fund for Coal and Steel Program, Project No. RFSR-2015-00024, entitled ?Development of Modular Steel Jacket for Offshore Windfarms? with a project acronym JABACO (2015?2018). The authors would also like to thank Dr. Giannoula Chatzopoulou for providing the shell element UMAT subroutine and Dr. Maria Vathi for supplying the tank geometries of the two case studies.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Cyclic inelastic response
Liquid storage tank
Nonlinear inelastic analysis
Seismic loading
Steel shell strength

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

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10.1016/j.tws.2020.107145Licence: None: All rights reserved

Cite this

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title = "Uplift mechanics of unanchored liquid storage tanks subjected to lateral earthquake loading",

abstract = "Motivated by the seismic response of unanchored liquid storage tanks, their uplift mechanism under strong lateral loading is examined. Using three-dimensional finite element models, nonlinear static analysis is conducted to define the moment-rotation relationship of uplifting tanks resting on rigid foundation and describe the evolution of critical response parameters with increasing level of lateral loading. Meridional and hoop stress, as well as their distribution and evolution with increased uplift are computed. Comparing the numerical results with the corresponding results from anchored tanks, striking differences are observed on the values of compressive meridional stresses and their distribution around the tank circumference. Cyclic analysis, associated with repeated uplift at both sides of the tank, is also performed, to obtain the corresponding hysteretic response and verify the assumption of nonlinear-elastic tank behaviour, used in several previous works. Finally, an analytical solution is developed, capable of describing tank uplift in an efficient manner. The analytical solution accounts for the special features of uplift, obtained from the finite element solution, and can be used for simple and reliable assessment of seismic performance in unanchored liquid storage tanks.",

keywords = "Cyclic inelastic response, Liquid storage tank, Nonlinear inelastic analysis, Seismic loading, Steel shell strength",

author = "Konstantinos Bakalis and Karamanos, {Spyros A.}",

note = "Funding Information: This research was partially supported by a financial grant from the European Commission through the Research Fund for Coal and Steel Program, Project No. RFSR-2015-00024, entitled ?Development of Modular Steel Jacket for Offshore Windfarms? with a project acronym JABACO (2015?2018). The authors would also like to thank Dr. Giannoula Chatzopoulou for providing the shell element UMAT subroutine and Dr. Maria Vathi for supplying the tank geometries of the two case studies. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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doi = "10.1016/j.tws.2020.107145",

language = "English",

volume = "158",

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AU - Karamanos, Spyros A.

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PY - 2021/1

Y1 - 2021/1

N2 - Motivated by the seismic response of unanchored liquid storage tanks, their uplift mechanism under strong lateral loading is examined. Using three-dimensional finite element models, nonlinear static analysis is conducted to define the moment-rotation relationship of uplifting tanks resting on rigid foundation and describe the evolution of critical response parameters with increasing level of lateral loading. Meridional and hoop stress, as well as their distribution and evolution with increased uplift are computed. Comparing the numerical results with the corresponding results from anchored tanks, striking differences are observed on the values of compressive meridional stresses and their distribution around the tank circumference. Cyclic analysis, associated with repeated uplift at both sides of the tank, is also performed, to obtain the corresponding hysteretic response and verify the assumption of nonlinear-elastic tank behaviour, used in several previous works. Finally, an analytical solution is developed, capable of describing tank uplift in an efficient manner. The analytical solution accounts for the special features of uplift, obtained from the finite element solution, and can be used for simple and reliable assessment of seismic performance in unanchored liquid storage tanks.

AB - Motivated by the seismic response of unanchored liquid storage tanks, their uplift mechanism under strong lateral loading is examined. Using three-dimensional finite element models, nonlinear static analysis is conducted to define the moment-rotation relationship of uplifting tanks resting on rigid foundation and describe the evolution of critical response parameters with increasing level of lateral loading. Meridional and hoop stress, as well as their distribution and evolution with increased uplift are computed. Comparing the numerical results with the corresponding results from anchored tanks, striking differences are observed on the values of compressive meridional stresses and their distribution around the tank circumference. Cyclic analysis, associated with repeated uplift at both sides of the tank, is also performed, to obtain the corresponding hysteretic response and verify the assumption of nonlinear-elastic tank behaviour, used in several previous works. Finally, an analytical solution is developed, capable of describing tank uplift in an efficient manner. The analytical solution accounts for the special features of uplift, obtained from the finite element solution, and can be used for simple and reliable assessment of seismic performance in unanchored liquid storage tanks.

KW - Cyclic inelastic response

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KW - Nonlinear inelastic analysis

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Uplift mechanics of unanchored liquid storage tanks subjected to lateral earthquake loading

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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