Buckling behavior of cylindrical steel tanks with concavity of vertical weld line imperfection

2018 ◽  
Vol 145 ◽  
pp. 289-299 ◽  
Author(s):  
Mehdi Rastgar ◽  
Hossein Showkati
Keyword(s):  
Weld Line ◽  
Buckling Behavior ◽  
Steel Tanks ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel

Stability Analysis of Floating-Roof Tanks under Differential Settlement

2010 ◽  
Vol 163-167 ◽  
pp. 55-60
Author(s):  
Yang Zhao ◽  
Xiang Lei ◽  
Xing Zhang
Keyword(s):  
Local Buckling ◽  
Structural Response ◽  
Nonlinear Behavior ◽  
Differential Settlement ◽  
Tank Wall ◽  
Buckling Behavior ◽  
Steel Tanks ◽  
Post Buckling ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel

Vertical cylindrical steel tanks are sensitive to differential settlement beneath the tank wall. Most previous studies were based on idealized harmonic settlement, however, for thin shell structures of high nonlinear behavior, it is obviously inappropriate to obtain the results under real settlement by simple summation of harmonic solutions. Real settlement of steel tanks can be grouped into two types - global differential settlement and local differential settlement. This paper examines the nonlinear response and stability behavior of floating-roof steel tanks under both types of settlement. It is shown that, for tanks under global differential settlement, local buckling occurs at the eave ring, followed by a stable post-buckling behavior, and final failure is by overall buckling of the tank shell; while for tanks under local differential settlement, the structural response is related to the degree of localization. At highly localized settlement, local snap-through buckling occurs at the tank wall, but it does not lead to a serious consequence, and the post-buckling behavior can also be utilized in design.

scholarly journals The modal analysis of cylindrical steel tank with selfsupported roof filled with different level of liquid

2013 ◽  
Vol 12 (2) ◽  
pp. 205-212
Author(s):  
Daniel Burkacki ◽  
Michał Wójcik ◽  
Robert Jankowski
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Environmental Disaster ◽  
Natural Modes ◽  
Liquid Products ◽  
Safety And Reliability ◽  
Steel Tank ◽  
Steel Tanks ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel

In technical branches, such as chemical or petroleum industries, cylindrical steel tanks are essential structures used for storage of liquid products. Therefore, their safety and reliability is essential, because any failure might have dangerous consequences, in extreme cases may even lead to an environmental disaster. The aim of the presented paper is to show the results of the modal analysis concerning the cylindrical steel tank with self-supported roof which has been constructed in northern Poland. The investigation was carried out with the use of the FEM commercial computer program Abaqus. The values of natural frequencies, as well as the natural modes, for different levels of liquid filling (empty tank, partly filled and tank fully filled) were determined in the study. The results of the study clearly indicate that the increase in the liquid level leads to the substantial decrease in the natural frequencies of the structure.

Stability of Open‐Top Cylindrical Steel Tanks with Primary Stiffening Ring under Wind Loading

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1781-1788
Author(s):  
Özer Zeybek ◽  
Cem Topkaya ◽  
J. Michael Rotter
Keyword(s):  
Wind Loading ◽  
Steel Tanks ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel

Numerical Evaluation of Nonlinear Response of Broad Cylindrical Steel Tanks under Multidimensional Earthquake Motion

2012 ◽  
Vol 28 (1) ◽  
pp. 217-238 ◽  
Author(s):  
Zuhal Ozdemir ◽  
Mhamed Souli ◽  
M. Fahjan Yasin
Keyword(s):  
Ground Motion ◽  
Vertical Component ◽  
Actual Behavior ◽  
Tank Model ◽  
Current Design ◽  
Steel Tanks ◽  
Vertical Ground ◽  
Support Conditions ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel

In this paper, a fluid-structure interaction (FSI) algorithm of the finite element method (FEM), which can take into account the effects of geometric and material nonlinearities of the tank, buckling of the tank shell, and nonlinear sloshing behavior of the contained liquid, is utilized to evaluate the actual behavior of broad cylindrical steel tanks when subjected to strong earthquake motions. In order to clarify a key question—whether anchoring would prevent earthquake damage to tanks—numerical analyses are carried out on the same tank model having two different support conditions: anchored and unanchored. In addition to two horizontal components of ground motion, the vertical component is also taken into account in order to determine the relative importance of vertical ground motion in the behavior of tanks. The consistency of provisions presented in current design codes and numerical analysis results is evaluated.

SEISMIC BEHAVIOR OF ANCHORAGE IN DIVERSE LIQUID STORAGE STEEL TANKS BY ADDED-MASS METHOD

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Kamyar Kildashti ◽  
Neda Mirzadeh
Keyword(s):  
Failure Modes ◽  
Added Mass ◽  
Lumped Mass ◽  
Liquid Storage ◽  
Lumped Mass Method ◽  
Dynamic Loadings ◽  
Steel Tanks ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel ◽  
Structure Result

Deformation of liquid storage tanks and the interaction between fluid and structure result in a variety of possible failure mechanisms during earthquakes. Among all failure modes, base-anchor failure is this paper’s focus. Three cylindrical steel tanks with different H/D were selected to investigate dynamic loadings on the tank seismic responses. The added-mass method was used in the finite element modeling of the steel tanks and fluid, and numerical analyses were performed. The added-mass method results were compared to conventional method outcomes using two or more lumped-mass and equivalent springs for tank-liquid simulation (Housner method). It was found that the added-mass method results in greater forces on the anchors in comparison to the lumped-mass method.

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