Ultimate State of Bridges with Rocking Isolation under Extreme Earthquakes

2014 ◽  
Vol 580-583 ◽  
pp. 1555-1558
Author(s):  
Tzu Ying Lee ◽  
Min Yen Huang ◽  
Kun Jun Chung
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vector Form ◽  
Ultimate State ◽  
Dynamic Behaviors ◽  
Analytical Results ◽  
Highly Nonlinear ◽  
Nonlinear Behaviors ◽  
Element Method

This study is aimed to analyze the ultimate state of bridges with rocking isolation of spread foundations under extreme earthquakes. The Vector Form Intrinsic Finite Element method (VFIFE) is adopted to simulate the failure procedure of bridges with and without rocking isolation. To simulate the highly nonlinear behaviors between soil and foundations, Winkler-based models are established in the VFIFE in this study. A practical five-span bridge with spread foundations is chosen to study the effect of rocking isolation and discuss the influence of altering parameters of bridges. The analytical results are compared between linear soil springs and nonlinear soil springs. Furthermore, the ultimate state of bridges is simulated to realize the dynamic behaviors of bridges under extreme earthquakes.

THE SCALED BOUNDARY FINITE ELEMENT ANALYSIS OF SEEPAGE PROBLEMS IN MULTI-MATERIAL REGIONS

2012 ◽  
Vol 09 (01) ◽  
pp. 1240008 ◽  
Author(s):  
FENGZHI LI ◽  
QIANG TU
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Solutions ◽  
Data Preparation ◽  
Element Analysis ◽  
Satisfactory Accuracy ◽  
Analytical Results ◽  
Scaled Boundary Finite Element ◽  
Element Method

The scaled boundary finite element method (SBFEM) is used to solve the seepage problems with multi-material regions. Two models of dam base with waterproof screen and dam body with the regions of two materials are established. The numerical solutions are obtained and then compared with the analytical results or numerical solutions in the references. The conclusion shows that the SBFEM has more satisfactory accuracy and less data preparation amount.

Dynamic analysis of steel catenary riser on the nonlinear seabed using vector form intrinsic finite element method

2021 ◽  
Vol 241 ◽  
pp. 109982
Author(s):  
Yang Yu ◽  
Shengbo Xu ◽  
Jianxing Yu ◽  
Weipeng Xu ◽  
Lixin Xu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Analysis ◽  
Vector Form ◽  
Steel Catenary Riser ◽  
Element Method

scholarly journals Accelerating the Finite-Element Method for Reaction-Diffusion Simulations on GPUs with CUDA

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 881 ◽  
Author(s):  
Hedi Sellami ◽  
Leo Cazenille ◽  
Teruo Fujii ◽  
Masami Hagiya ◽  
Nathanael Aubert-Kato ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temporal Dynamics ◽  
Dna Nanotechnology ◽  
Reaction Diffusion ◽  
Reaction Diffusion Equations ◽  
The Finite Element Method ◽  
Highly Nonlinear ◽  
Spatio Temporal ◽  
Element Method

DNA nanotechnology offers a fine control over biochemistry by programming chemical reactions in DNA templates. Coupled to microfluidics, it has enabled DNA-based reaction-diffusion microsystems with advanced spatio-temporal dynamics such as traveling waves. The Finite Element Method (FEM) is a standard tool to simulate the physics of such systems where boundary conditions play a crucial role. However, a fine discretization in time and space is required for complex geometries (like sharp corners) and highly nonlinear chemistry. Graphical Processing Units (GPUs) are increasingly used to speed up scientific computing, but their application to accelerate simulations of reaction-diffusion in DNA nanotechnology has been little investigated. Here we study reaction-diffusion equations (a DNA-based predator-prey system) in a tortuous geometry (a maze), which was shown experimentally to generate subtle geometric effects. We solve the partial differential equations on a GPU, demonstrating a speedup of ∼100 over the same resolution on a 20 cores CPU.

Temperature distribution analysis in a fully wet moving radial porous fin by finite element method

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
B.J. Gireesha ◽  
G. Sowmya ◽  
Madhu Macha
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Radial Profile ◽  
Heat Transfer Analysis ◽  
Distribution Analysis ◽  
Content Type ◽  
Porous Fin ◽  
Highly Nonlinear ◽  
Element Method

Purpose This paper aims to study the temperature performance with natural convection and radiation effect on a porous fin in fully wet condition. Design/methodology/approach The finite element method (FEM) is applied to generate numerical solution of the obtained non-dimensional ordinary differential equation containing highly nonlinear terms. The parameters which impact on the heat transfer of fin have been scrutinized by means of plotted graphs. Findings The porous fin is taken for the analysis in radial profile moving with constant velocity. Here, the thermal conductivity is considered to be temperature dependent. The Darcy’s model has been implemented to study the heat transfer analysis. Originality/value The paper is genuine in its type, and there are hardly any works on fins as per the authors’ knowledge.

Contact Friction Simulating between Two Rock Bodies Using ANSYS

2017 ◽  
Vol 29 ◽  
pp. 1-9
Author(s):  
Kamel Ghouilem ◽  
Rachid Mehaddene ◽  
Mohammed Kadri
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Load Condition ◽  
Contact Problems ◽  
Element Model ◽  
Contact Friction ◽  
Hard Material ◽  
Tangential Load ◽  
Highly Nonlinear ◽  
Element Method

The ANSYS® Finite Element Method (FEM) program offers a variety of elements designed to treat cases of changing mechanical contact between the parts of an assembly or between different faces of a single part. These elements range from simple, limited idealizations to complex and sophisticated, general purpose algorithms. Contact problems are highly nonlinear and require significant computer resources to solve. Recently, analysts and designers have begun to use numerical simulation alone as an acceptable mean of validation employing numerical Finite Element Method (FEM). Contact problems fall into two general classes: rigid-to-flexible and flexible-to-flexible. In general, any time a soft material comes in contact with a hard material, the problem may be assumed to be rigid-to-flexible. The other class, flexible-to-flexible, is the more common type. To model a contact problem, you first need to identify the parts to be analyzed for their possible interaction. If one of the interactions is at a point, the corresponding component of your model is a node. If one of the interactions is at a surface, the corresponding component of your model is an element. The finite element model recognizes possible contact pairs by the presence of specific contact elements. These contact elements are overlaid on the parts of the model that are being analyzed for interaction. This paper present a simulation contact friction between Two Rock bodies loaded under two types of load condition: Axial pressure Load “σ” and Tangential Load “τ”. ANSYS® software has been used to perform the numerical calculation in this paper.

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