The tapered beam model for bottom plate uplift analysis of unanchored cylindrical steel storage tanks

2009 ◽  
Vol 31 (3) ◽  
pp. 623-632 ◽  
Author(s):  
Masoud Nourali Ahari ◽  
Sassan Eshghi ◽  
Mohsen Ghafory Ashtiany
Keyword(s):  
Bottom Plate ◽  
Beam Model ◽  
Storage Tanks ◽  
Tapered Beam ◽  
Cylindrical Steel

Nonlinear behaviour of bottom plate in cylindrical liquid storage tanks for seismic applications

1995 ◽  
Vol 22 (1) ◽  
pp. 180-189 ◽  
Author(s):  
David T. Lau ◽  
Xianguang Zeng
Keyword(s):  
Bottom Plate ◽  
Response Analysis ◽  
Beam Model ◽  
Nonlinear Behaviour ◽  
Storage Tanks ◽  
One Dimensional ◽  
Nonlinear Springs ◽  
Liquid Storage ◽  
Cylindrical Tanks ◽  
Seismic Applications

The paper presents a simplified pseudostatic approach to model the nonlinear behaviour of the bottom plate in unanchored cylindrical liquid storage tanks for seismic applications. In this paper, the problem of axisymmetric uplift of the bottom plate is studied for tanks supported on both rigid and elastic Winkler foundations. In the analysis, the bottom plate is modelled by one-dimensional beam and two-dimensional plate models. By comparing the results, it is found that the one-dimensional beam model gives accurate results acceptable for all practical design purposes, in view of the many other uncertainties in the tank uplift problem. The analysis results also show that the support foundation flexibility may have significant effects on the uplift behaviour of the tanks. Based on the axisymmetric uplift results, the paper then presents a simple approach to model the seismic partial uplift problem of unanchored tanks by means of nonlinear springs. Modelling parameters for the nonlinear springs are generated for dynamic uplift response analysis. Sensitivities of the uplift behaviour and the nonlinear spring modelling parameters to the tank height-to-radius ratio and the soil stiffness are also studied. Key words: axisymmetric uplift, cylindrical tanks, earthquakes, pressure vessel, shell, soil effect.

Effect of Annular Plate Projection Length on the Stresses in the Above Ground Steel Storage Tanks on Rigid Ring Wall Foundations

2011 ◽  
Author(s):  
Sridhar Sathyanarayanan ◽  
Seshu M. R. Adluri
Keyword(s):  
Life Cycle ◽  
Elevated Temperature ◽  
Theoretical Model ◽  
Annular Plate ◽  
Bottom Plate ◽  
Storage Tanks ◽  
Plastic Hinges ◽  
Rigid Ring ◽  
Design Life ◽  
Projection Length

The paper examines the effect of increased bottom plate projection for tanks with rigid ring wall foundations. A theoretical model, based on the existing model from Denham is proposed to determine the maximum projection length. The behavior of the tank, specifically near the bottom is studied till failure using FEA. The formation of plastic hinges in the bottom plate on the inside and outside of this joint is discussed in detail. The validity of the assumptions made by Karcher with regard to plastic hinges for obtaining the expression for the design life cycle in elevated temperature tanks is briefly analyzed.

Buckling Characteristics of Floating Roof Pontoons in Aboveground Storage Tanks Subjected to Bending Load in Two Directions

2008 ◽  
Author(s):  
Shoichi Yoshida ◽  
Kazuhiro Kitamura
Keyword(s):  
Large Diameter ◽  
Bending Moment ◽  
Bottom Plate ◽  
Storage Tanks ◽  
Buckling Strength ◽  
Linear Elastic ◽  
Structural Problems ◽  
Oil Storage ◽  
Bending Load ◽  
Shell Finite Element

The 2003 Tokachi-Oki earthquake caused severe damage to aboveground oil storage tanks due to liquid sloshing. Seven single-deck floating roofs had experienced structural problems as evidenced by sinking failure in large diameter tanks at the refinery in Tomakomai, Japan. The pontoons of the floating roofs might be buckled due to circumferential bending moment during the sloshing. The content in the tank was spilled on the floating roof from small failures which were caused at the welding joints of pontoon bottom plate by the buckling. Then the floating roof began to lose buoyancy and submerged into the content slowly. The authors had reported the buckling strength of the pontoons with and without ring stiffeners subjected to circumferential bending load in the previous papers. This paper presents the buckling strength of the pontoons subjected to both circumferential and radial bending load. The axisymmetric shell finite element method is used in the analysis. Linear elastic bifurcation buckling analysis is carried out and the buckling characteristics of the pontoon with and without ring stiffeners are investigated.

Settlement limitations for cylindrical steel storage tanks

1982 ◽  
Vol 19 (3) ◽  
pp. 232-238 ◽  
Author(s):  
Peter Rosenberg ◽  
Noël L. Journeaux
Keyword(s):  
Petroleum Industry ◽  
Storage Tanks ◽  
Cylindrical Steel

Tank inspections in the petroleum industry often include an evaluation of settlement effects. Tank failures and floating-roof problems have often been attributed to distortion of tanks due to settlement. In geotechnical practice evaluation of excessive settlement is done by referring to empirically derived limits that vary considerably.In this study the authors took settlement data from the literature and their own studies, and compared the results with limits commonly used in tank evaluations. On this basis tentative limit criteria are suggested that can be used in estimating the probability of the occurrence of tank problems.

The uplift effect of bottom plate of aboveground storage tanks subjected to wind loading

2019 ◽  
Vol 144 ◽  
pp. 106241 ◽  
Author(s):  
Wanshi Hu ◽  
Harsh Bohra ◽  
Eyas Azzuni ◽  
Sukru Guzey
Keyword(s):  
Wind Loading ◽  
Bottom Plate ◽  
Storage Tanks

Behavior of Localized Bottom Bulge in Aboveground Oil Storage Tanks Under Liquid Pressure

2001 ◽  
Vol 124 (1) ◽  
pp. 59-65
Author(s):  
Shoichi Yoshida
Keyword(s):  
Plastic Strain ◽  
Plate Thickness ◽  
Deformation Analysis ◽  
Bottom Plate ◽  
Storage Tanks ◽  
Liquid Pressure ◽  
Element Analysis ◽  
Oil Storage ◽  
Relationship Of ◽  
The Relationship

The bottom plate of aboveground oil storage tanks can bulge, separating from the foundation due to welding deformation. When such a bulge is subjected to liquid pressure, it deforms continuously to make contact with the foundation from the edge, and the remaining area of the bulge decreases with increasing liquid pressure. As a result, the deformation is extremely localized and plastic strain occurs at the bulge. This paper presents a plane strain finite element analysis for the evaluation of localized bottom bulges in aboveground oil storage tanks. Load-incremental, elastic-plastic large deformation analysis is carried out considering the bottom plate contact with the foundation. The relationship of the plastic strain at the bulged bottom plate to the liquid pressure is discussed together with the deformation of the bulge. As a result, the bottom plate thickness has a significant effect on the deformation, but the bulged height does not. After the bulged center makes contact with the foundation, the stress and strain do not increase with increasing liquid pressure. In addition, the permissible bulged profile specified by API Standard 653 elastically deforms to make contact with the foundation under low liquid pressure.

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