scholarly journals Effect of the Directional Components of Earthquakes on the Seismic Behavior of an Unanchored Steel Tank

2020 ◽  
Vol 10 (16) ◽  
pp. 5489
Author(s):  
Rulin Zhang ◽  
Shili Chu ◽  
Kailai Sun ◽  
Zhongtao Zhang ◽  
Huaifeng Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ground Motion ◽  
Seismic Behavior ◽  
Axial Stress ◽  
Ground Motions ◽  
Great Influence ◽  
Liquid Sloshing ◽  
Base Shear ◽  
Element Method

This paper investigates the effect of the multi-directional components of ground motion on an unanchored steel storage tank. Both the liquid sloshing effect and contact behavior between the foundation and tank are included in the study. A three-dimensional model for a foundation–structure–liquid system is numerically simulated using the finite element method. The Lagrange fluid finite element method (FEM) in ANSYS is used to consider the liquid–solid interaction. In the liquid–structure–foundation interaction model, the contact and target elements are adapted to simulate the nonlinear uplift and slip effects between the tank and the foundation. Three earthquake ground motions are selected for evaluating the seismic behavior of the tank. Comparisons are made on the horizontal displacement, “elephant-foot” deformation, stress, base shear and moment, sloshing of the liquid, uplift, as well as slip behavior under the application of the unidirectional, bi-directional and tri-directional components. Under the selected ground motions, the horizontal bi-directional seismic component has great influence on the liquid sloshing in the tank studied in this paper. The vertical seismic component produces high compressive axial stress, and it also makes the uplift and slide of the tank bottom increase significantly. The applicability of this conclusion should be carefully considered when applied to other types of ground motion inputs.

Transient Analysis of Dam-Reservoir Interaction Based on Dynamic Stiffness of SBFEM

2011 ◽  
Vol 378-379 ◽  
pp. 213-217
Author(s):  
Shang Ming Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Time Domain ◽  
Transient Analysis ◽  
Ground Motions ◽  
Dynamic Stiffness ◽  
Dam Reservoir ◽  
The Time Domain ◽  
Infinite Reservoir ◽  
Element Method

The scaled boundary finite element method (SBFEM) was extended to solve dam-reservoir interaction problems in the time domain and a dynamic stiffness used in the SBFEM of semi-infinite reservoir in the time domain was proposed, which was evaluated by the Bessel function. Based on the dynamic stiffness, transient responses subjected to horizontal ground motions were analyzed through coupling the SBFEM and finite element method (FEM). A dam was modeled by FEM, while the whole fluid in reservoir was modeled by the SBFEM alone or a combination of FEM and SBFEM. Two benchmark examples were considered to check the accuracy of the dynamic stiffness. Results were compared with those from analytical or substructure methods and good agreements were found.

Application of a Discontinuous Galerkin Finite Element Method to Liquid Sloshing

2005 ◽  
Vol 128 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Martin J. Guillot
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Discontinuous Galerkin ◽  
Water Surface ◽  
Convergence Rates ◽  
Second Order ◽  
Liquid Sloshing ◽  
Surface Elevation ◽  
Water Surface Elevation ◽  
Element Method

A Runge-Kutta discontinuous Galerkin (RKDG) finite element method is applied to the liquid sloshing problem using the depth-averaged shallow water equations in a rotating frame of reference. A weak statement formulation is developed by multiplying the equations by a test function and integrating over a typical element. The basis functions are Legendre polynomials of degree one, resulting in formally second-order spatial accuracy. Second-order time integration is achieved using a second-order Runge-Kutta method. A minmod slope limiter is incorporated into the solution near discontinuities to control nonphysical oscillations and to ensure nonlinear total variation bounded stability. The method is first applied to the dam-breaking problem with zero rotation to validate the basic numerical implementation. Grid independence of the solutions is established and solution error is quantified by computing the L1 norm and comparing the estimated convergence rates to theoretical convergence rates. Stability is demonstrated subject to a Courant-Fredricks-Lewey restriction. Sloshing in a nonrotating tank with a prescribed initial water surface elevation is first investigated to demonstrate the ability of the method to capture the wave speed of traveling waves, followed by a tank undergoing sinusoidal rotation. Time histories of water surface elevation at selected locations, as well as pressure distribution on the tank walls and the corresponding moment about the tank centerline are computed and compared to experimental data and to previous computations. Finally, a limited parameter study is performed to determine the effect of varying roll angle, depth to width ratio, and forcing frequency on the resulting maximum moment about the tank centerline.

Analysis of Knuckle Arm's Fatigue Life

2010 ◽  
Vol 152-153 ◽  
pp. 1346-1350
Author(s):  
Ruo Ping Wang ◽  
Pei Feng ◽  
Yan Qiang Wang
Keyword(s):  
Finite Element Method ◽  
Surface Roughness ◽  
Finite Element ◽  
Fatigue Life ◽  
Surface Quality ◽  
Great Influence ◽  
Simulation Test ◽  
Corrective Measures ◽  
Fillet Radius ◽  
Element Method

The transition fillet radius and surface roughness have a great influence on the part’s fatigue life. In this paper, we analyzed the reasons of a light vehicle’s knuckle arm fracture theoretically by finite element method and took corrective measures such as enlarging the transition fillet and improving the surface quality. After simulation test, we learned that these measures enhance the fatigue life of knuckle arm indeed.

Finite element method for analyzing effects of porous baffle on liquid sloshing in the two-dimensional tanks

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hangduo Gao ◽  
Zhao Yin ◽  
Jun Liu ◽  
Quansheng Zang ◽  
Gao Lin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Control Variable ◽  
Liquid Sloshing ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Content Type ◽  
Effect Parameter ◽  
And Control ◽  
Element Method

Purpose The purpose of this paper is to analyze the liquid sloshing behaviors in two-dimensional tanks with various porous baffles under the external excitation. Design/methodology/approach Adopting the finite element method (FEM) and control variable method to study the impacts of the height, length, number, location, shape, porous-effect parameter of the porous baffle, the external load frequency and the shape of the tank on the liquid sloshing response. Findings The amplitude of the free surface can be reduced effectively when the baffle opening is appropriate. The anti-sway ability of the system increases in pace with the baffle’s height growing. Under the same conditions, the shapes of the baffles have an important effect on improving the anti-sway ability of the system. Originality/value As there exist the differences of the velocity potential between each side of the porous baffle, which means that there are two different velocity potentials at a point on the porous baffle, the conventional finite element modeling technologies are not suitable to be applied here. To deal with this problem, the points on the porous baffle are regarded as two nodes with the same coordinate to model and calculate.

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