Influence of Cutout Position on Buckling of Large-Scale Thin-Walled Cylindrical Shell of Desulphurizing Tower with Welding Induced Imperfection under Wind Loading

2014 ◽  
Vol 687-691 ◽  
pp. 68-72
Author(s):  
Qian Li ◽  
Deng Feng Wang
Keyword(s):  
Finite Element Method ◽  
Cylindrical Shell ◽  
Large Scale ◽  
Cylindrical Shells ◽  
Nonlinear Finite Element ◽  
Wind Loading ◽  
Nonlinear Finite Element Method ◽  
Geometrical Imperfection ◽  
Thin Walled ◽  
Steel Cylindrical Shell

Not only the geometrical imperfection induced by welding but also cutouts will influence the buckling of large-scale thin-walled steel cylindrical shell under wind loading. Based on the practical cylindrical shells of a desulphurizing absorption tower, in consideration of the correlation between welding induced imperfection and circular cutouts, the influence of cutout position on buckling of cylinder under wind loading is investigated by nonlinear finite element method. The results indicate that the buckling capacity varies slightly when the cutout position moves along meridional direction in the neighboring region of welding imperfection. The buckling capacity varies significantly when the cutout position moves circumferentially as the cutout is located in the welding imperfection. The buckling capacity reaches the minimum value as the cutout is located in the buckle center of cylindrical shells without cutout.

Buckling of Thin-Walled Cylindrical Shells of Desulphurizing Tower under Wind Loading

2014 ◽  
Vol 662 ◽  
pp. 147-152
Author(s):  
Li Cheng Pan ◽  
Deng Feng Wang
Keyword(s):  
Large Scale ◽  
Cylindrical Shells ◽  
Radial Pressure ◽  
Wind Loading ◽  
Radial Compression ◽  
Buckling Mode ◽  
Linear Elastic ◽  
Nonlinear Finite Element Methods ◽  
Post Buckling ◽  
Thin Walled

On the project background of the large-scale thin-walled cylindrical shells of a practical desulphurizing absorption tower, the investigations are conducted into the buckling mode and buckling capacity of the large-scale thin-walled cylindrical shells under wind loading by nonlinear finite element methods. In the buckling path, it firstly presents the buckling mode similar to that of the stocky cylinder under uniform external radial compression. In the post-buckling stage, the snap-through takes place, the buckling mode turns to being similar to the axial compressive buckling mode of the medium-height cylinder that horizontal buckles occur in the upper half of the front area. The buckling capacity of the cylindrical shells of desulphurizing tower is some more than the linear elastic buckling pressure of the cylinder under uniform radial pressure.

Research on Optimizing Precast Water Head on Preloading Filling Spiral Case of a Large-Scale Hydropower Station

2011 ◽  
Vol 243-249 ◽  
pp. 6183-6187
Author(s):  
Hai Lin Wu ◽  
Shi He Qin ◽  
Yao Li ◽  
Xiao Fan Du
Keyword(s):  
Finite Element Method ◽  
Large Scale ◽  
Mechanical Characteristics ◽  
Nonlinear Finite Element ◽  
Hydropower Station ◽  
Nonlinear Finite Element Method ◽  
Contact State ◽  
Water Head ◽  
Spiral Case ◽  
Pumped Storage

In combination with the practice of a pumped storage hydropower station, a 3-D nonlinear finite element method on the preloading filling spiral case is carried out to compare and analyze stresses of the steel spiral case and hoop reinforcement, the stress and bearing ratio of the surrounding concrete, the contact state between the spiral case and concrete in different precast water head. The results indicate that the stress of the surrounding concrete will get better with the increasing of precast water head. But there is a distance between the spiral case and the surrounding concrete when the water head is excessive, which is unhelpful for operating of the unit. When the precast water head of the spiral case is 439m or so, it can play a greater degree of mechanical characteristics of steel and concrete under the premise of operating stably of the unit.

The Instability of Webs in Transport

2010 ◽  
Vol 78 (1) ◽  
Author(s):  
J. A. Beisel ◽  
J. K. Good
Keyword(s):  
Finite Element Method ◽  
Cylindrical Shell ◽  
Plate Theory ◽  
Constitutive Relations ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Process Machinery ◽  
Out Of Plane ◽  
Strain Dependent ◽  
The Web

A method is presented for determining the two levels of instability that are associated with thin web materials traveling through process machinery. The first level of instability involves the out-of-plane buckling of expanses of web supported only by rollers at opposing ends. A method is developed using linear plate theory, which is verified by tests that show that this first level of instability can be predicted. The second level of instability involves the buckling of the web when it has taken the form of a cylindrical shell as it transits a roller. A nonlinear finite element method with strain dependent constitutive relations is developed and verified by tests to predict this second level of instability.

Study on Antiseismic Measures of Tailings Dam

2011 ◽  
Vol 90-93 ◽  
pp. 44-47
Author(s):  
Jian Ping Pan ◽  
Sheng Yi Wang ◽  
Shui Tai Xu
Keyword(s):  
Finite Element Method ◽  
Rock Pressure ◽  
Deformation Characteristic ◽  
Nonlinear Finite Element ◽  
Stone Column ◽  
Tailings Dam ◽  
Nonlinear Finite Element Method ◽  
Reinforcement Effect ◽  
Earthquake Action ◽  
Seismic Deformation

Tailings dam due to earthquake action may lead to severe slippage damage, and setting antiseismic measure is an effective method to prevent damage. Dynamic nonlinear finite element method is used in the efforts to analyze the earthquake reaction and the deformation characteristic. To reduce dam seismic deformation, the reinforcement effect of geotextiles, rock pressure and stone column is studied. Finally, a synthetically antiseismic measure that is composed of geotextiles-reinforced in sub-dam, rock pressure out of starter dam and densification foundation is proposed. It is found that the synthetically antiseismic measure produces better antiseismic effect, and offers a consult for the antiseismic design of tailings dam.

Small-Scaled Experimental Research on the Buckling of Steel Containment Under Axial Compression

2017 ◽  
Author(s):  
Pengfei Li ◽  
Fuquan Hu ◽  
Xuwei Wang ◽  
Zheng He ◽  
Zhi Gang
Keyword(s):  
Finite Element Method ◽  
Reference Value ◽  
Fem Analysis ◽  
Nonlinear Finite Element ◽  
Geometrical Parameters ◽  
Nonlinear Finite Element Method ◽  
Arc Length ◽  
Axial Pressure ◽  
Elastoplastic Constitutive Model ◽  
Shape Imperfection

Focusing on the general and localized elastoplastic buckling of the cylindrical section of steel containment under axial pressure, nonlinear finite element method (FEM) and small-scaled experiments are applied to analysis. First, FEM analysis is conducted considering nonlinear items caused by geometric shape imperfection and elastoplastic constitutive model by the arc-length method RIKS procedure. Parameter sensitivity of the buckling is revealed. Then, small-scaled experiments are carried out. Buckles status is observed, and key geometrical parameters’ influence are found. The results show that cylindrical buckling under axial pressure is sensitive to geometrical parameters and imperfection. It is necessary to employ more realistic parameters to the FEM analysis via accurate geometrical measurement. This research has reference value for the design and fabrication of AP series steel containment vessel.

Application of Finite-Element Method to Interstiffener Buckling in Submersible Cylindrical Hulls

1983 ◽  
Vol 27 (04) ◽  
pp. 281-285
Author(s):  
K. Rajagopalan ◽  
C. Ganapathy Chettiar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Program ◽  
Cylindrical Shells ◽  
Geometric Stiffness ◽  
Stiffness Matrices ◽  
Finite Element Procedure ◽  
Stepwise Variation ◽  
Thin Walled

A finite-element procedure for the determination of buckling pressure of thin-walled cylindrical shells used in ocean structures is presented. The derivation of the elastic and geometric stiffness matrices is discussed in detail followed by a succinct description of the computer program developed by the authors during the course of this study for the determination of the buckling pressure. Particular attention is paid to the boundary conditions which strongly influence the buckling pressure. Applications involving the interstiffener buckling in submersible hulls and cylindrical shells with stepwise variation in wall thickness are considered and the results compared with the solutions and procedures available in the literature.

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