scholarly journals Comparative Study Among Direct Design Method, Equivalent Frame Method and Finite Element Method for Analysis of Slabs

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Mereen Hassan Fahmi Rasheed ◽  
Bahman Omar Taha
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Method ◽  
Computer Software ◽  
Direct Design ◽  
The Face ◽  
Frame System ◽  
Equivalent Frame ◽  
Frame Method ◽  
Element Method

Beam-column frame system and flat plate slab system are analysed by semi-empirical, Direct Design method (DDM) and approximate elastic method, Equivalent Frame method (FEM) and the results of both methods are compared with computer software based on Finite Element method (FEM), taking into account the effect of changing the beam and column stiffness and the panel length ratio, for 3, 4, and 5 equal span frames and three non-equal spans. The moment coefficients with respect to the maximum clear span moment are determined by the three methods for negative end moments at the face of support and mid span positive moment. These coefficients are constant in DDM, while in EFM are changed with changing the column and beam sizes. The results of EFM is more accurate than DDM, on the bases of results of EFM, new moment coefficients are suggested to use instead of DDM moment coefficients. In case of EFM calculation aren’t satisfactory for hand calculations the FEM is used by applying available computer software.

Coupled Analysis of Structural–Acoustic Problems Using the Cell-Based Smoothed Three-Node Mindlin Plate Element

2016 ◽  
Vol 13 (02) ◽  
pp. 1640007 ◽  
Author(s):  
Z. X. Gong ◽  
Y. B. Chai ◽  
W. Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Solid Mechanics ◽  
Mindlin Plate ◽  
Coupled Analysis ◽  
Plate Element ◽  
Fem Model ◽  
The Face ◽  
Smoothed Finite Element Method ◽  
Element Method

The cell-based smoothed finite element method (CS-FEM) using the original three-node Mindlin plate element (MIN3) has recently established competitive advantages for analysis of solid mechanics problems. The three-node configuration of the MIN3 is achieved from the initial, complete quadratic deflection via ‘continuous’ shear edge constraints. In this paper, the proposed CS-FEM-MIN3 is firstly combined with the face-based smoothed finite element method (FS-FEM) to extend the range of application to analyze acoustic fluid–structure interaction problems. As both the CS-FEM and FS-FEM are based on the linear equations, the coupled method is only effective for linear problems. The cell-based smoothed operations are implemented over the two-dimensional (2D) structure domain discretized by triangular elements, while the face-based operations are implemented over the three-dimensional (3D) fluid domain discretized by tetrahedral elements. The gradient smoothing technique can properly soften the stiffness which is overly stiff in the standard FEM model. As a result, the solution accuracy of the coupled system can be significantly improved. Several superior properties of the coupled CS-FEM-MIN3/FS-FEM model are illustrated through a number of numerical examples.

Robust Optimization for Tube Bending Process Based on Finite Element Method

2012 ◽  
Vol 531-532 ◽  
pp. 746-750
Author(s):  
Xue Wen Chen ◽  
Ze Hu Liu ◽  
Jing Li Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Robust Design ◽  
Process Parameters ◽  
Design Method ◽  
Design Parameters ◽  
Tube Bending ◽  
Performance Variation ◽  
Bending Process ◽  
Element Method

The main causes of performance variation in tube bending process are variations in the mechanical properties of material, initial tube thickness, coefficient of friction and other forming process parameters. In order to control this performance variation and to optimize the tube bending process parameters, a robust design method is proposed in this paper for the tube bending process, based on the finite element method and the Taguchi method. During the robust design process, the finite element analysis is incorporated to simulate the tube bending process and calculate the objective function value, the orthogonal design method is selected to arrange the simulation experiments and calculate the S/N ratio. Finally, a case study for the tube bending process is implemented. With the objective to control tube crack (reduce the maximum thinning ratio) and its variation, the robust design mathematical model is established. The optimal design parameters are obtained and the maximum thinning ratio has been reduced and its variation has been controlled.

A New Method to Quickly Optimize the Thickness of Multi-Holes Plate

2014 ◽  
Vol 915-916 ◽  
pp. 205-208
Author(s):  
Sheng Bin Wu ◽  
Xiao Bao Liu
Keyword(s):  
Mathematical Model ◽  
Finite Element Method ◽  
Finite Element ◽  
Design Method ◽  
New Method ◽  
The Finite Element Method ◽  
Design Error ◽  
Theory Of Plates ◽  
Plates And Shells ◽  
Element Method

The theory of plates and shells is not adapted to design thickness for the multi-holes plates in engineering. A new method to quickly optimize the thickness based on the finite element method theory was put forward. The method combined the theory of plate with the finite element method to establish a mathematical model and analyzed the influences of load, constraint and complexity on design error. The practices demonstrated that the proposed design method is effective and feasible.

RESEARCH OF THE STABILITY ANALYSIS FOR FRAME BUILDINGS USING FINITE ELEMENT METHOD

2019 ◽  
Vol 7 (1) ◽  
pp. 45-48
Author(s):  
Галина Кравченко ◽  
Galina Kravchenko ◽  
Елена Труфанова ◽  
Elena Trufanova ◽  
Анастасия Бойко ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Design Method ◽  
Progressive Collapse ◽  
Structural Member ◽  
Mode Shapes ◽  
Frame Buildings ◽  
The Stability ◽  
Element Method

In this article, general stability analysis is considered, in order to obtain the load-bearing capacity of the multy-storey building using finite element method. There are some graphical interpretations for FE results that illustrate safety factor for each structural member of the structure and different mode shapes with their corresponding frequencies. These results can be used to improve the structural member design method in case of progressive collapse possibility. The article provides recommendations for strengthening and design of structural member.

scholarly journals An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Binpeng Zhou ◽  
Junrui Chai ◽  
Jing Wang ◽  
Heng Zhou ◽  
Lifeng Wen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Crack Initiation ◽  
Rockfill Dam ◽  
Initiation And Propagation ◽  
The Face ◽  
Stress And Deformation ◽  
Concrete Face ◽  
Element Method

The concrete face of a rockfill dam is a long and thin slab structure, which is highly susceptible to fracture when subjected to the settlement of the dam. The study of the generation and propagation of cracks in the concrete face of rockfill dams is of great significance to dam construction and face crack prevention. In this study, the initiation and propagation of cracks in the concrete face of a rockfill dam are investigated using an extended finite element method (XFEM) and ABAQUS software for the Gongboxia concrete-face rockfill dam. A numerical model for this dam is established using a finite element method, and the face stress and deformation distributions are obtained. Based on the results, a numerical model is built to find the location where cracks are initiated in the face. The displacement of the entire model is treated as the equivalent displacement for the numerical model. XFEM is utilized throughout the modeling process to obtain the stress concentration, crack initiation, and crack propagation in the concrete face, and an analysis of crack initiation and propagation is conducted. Finally, the effects of the thickness of concrete covers and reinforcement layers on the stress intensity of crack tips are also discussed using the established numerical model, and techniques for controlling the fracturing of the concrete face have been proposed in this paper.

scholarly journals Study on the design method of equal strength rim based on stress and fatigue analysis using finite element method

2017 ◽  
Vol 9 (3) ◽  
pp. 168781401769269 ◽  
Author(s):  
Lei Chen ◽  
Shunping Li ◽  
Huiqin Chen ◽  
David M Saylor ◽  
Shuiguang Tong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Method ◽  
Fatigue Analysis ◽  
Equal Strength ◽  
Element Method

Fundamental Analysis of the Ultimate Strength Characteristics of R/C Arch Considering Loading Conditions

2013 ◽  
Vol 831 ◽  
pp. 120-123
Author(s):  
Hitoshi Mitsunaga ◽  
Tomoe Kirita ◽  
Takashi Hara
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Method ◽  
Initial Imperfection ◽  
Analysis Method ◽  
The Finite Element Method ◽  
Basic Form ◽  
Loading Tests ◽  
Experiment Analysis ◽  
Element Method

This paper presented the result of analysis about R/C arch by use of finite element method. The design method for R/C shell has not been established due to its numerical difficulties. Using the finite element method, it was possible to analyze these structures. However, the precise experiments were required to verify the reliability of these analyses and it was necessary to improve the numerical analyses. An R/C arch is a basic form of the R/C shell. Under various conditions, that was, R/C arch without initial imperfection, different rise-span ratio, three types of loading points and supporting conditions, loading tests of R/C arch were performed. After experiment, analysis was also carried out. And as the result compared experimental and numerical results, accuracy of this analysis method was elucidated.

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