scholarly journals Refinement of numerical models and parametric study of SOFC stack performance

2005 ◽  
Author(s):  
Andrew C. Burt
Keyword(s):  
Parametric Study ◽  
Numerical Models

scholarly journals Finite Element Modeling and Parametric Study on Floor Steel Beam Concrete Slab System in Non-Composite Action.

2018 ◽  
Vol 24 (7) ◽  
pp. 95
Author(s):  
Salah R. Al-Zaidee ◽  
Ehab Ghazi Al-Hasany
Keyword(s):  
Finite Element ◽  
Friction Force ◽  
Parametric Study ◽  
Numerical Models ◽  
Concrete Slab ◽  
Linear Regression Analysis ◽  
Element Model ◽  
Steel Beam ◽  
Composite Action ◽  
Shear Connectors

This study aims to show, the strength of steel beam-concrete slab system without using shear connectors (known as a non-composite action), where the effect of the friction force between the concrete slab and the steel beam has been investigated, by using finite element simulation. The proposed finite element model has been verified based on comparison with an experimental work. Then, the model was adopted to study the system strength with a different steel beam and concrete slab profile. ABAQUS has been adopted in the preparation of all numerical models for this study. After validation of the numerical models, a parametric study was conducted, with linear and non-linear Regression analysis. An equation regarding the concrete slab-steel beam system strength in non-composite action has been pointed out. Where the actual strength of the beam without using shear connectors has been located in between the full composite action and non-composite action. However, partial-composite action has been noted, due to the effectiveness of friction force which makes the beam behave as composite before the slip occurs.  

Material Property Effects on Critical Buckling Strains in Energy Pipelines

2002 ◽  
Author(s):  
Alfred B. Dorey ◽  
David W. Murray ◽  
J. J. Roger Cheng
Keyword(s):  
Material Property ◽  
Parametric Study ◽  
Numerical Models ◽  
Local Buckling ◽  
Analytical Models ◽  
Basic Material ◽  
Line Pipe ◽  
Moment Capacity ◽  
Yield Plateau ◽  
Critical Buckling Strain

Investigations in the development of a predictive critical buckling strain equation have shown that the grade of the material is one of five fundamental non-dimensional parameters in determining the critical local buckling strain for line pipe under combined loads. Further to this, the shape of the material curve also plays a significant role in the resulting critical buckling strain. Over 50 full-scale test specimens have been tested at the University of Alberta and effective numerical finite element analytical models have been developed. A parametric study consisting of 170 analyses was performed using the numerical models and critical buckling strain equations were derived. One of the essential variables in the new equations is a function of the specimen’s material properties. The results indicate that the higher the grade of the material the lower the value of the critical buckling strain. Furthermore, the level of agreement between the new equations and the experimental data was found to be dependent on the shape of the material curve for the specimen. Experimentally, two basic material curve shapes were observed, namely: specimens with a “rounded” material curve through the yield strength and specimens with a material property that exhibited a distinct “yield plateau” or yield point. Comparison of the experimental and numeric data showed that the specimens that were fabricated from material with a distinct yield plateau had different critical buckling strains when compared to specimens tested with rounded material curves. A subsequent parametric study was undertaken to examine the effect that the different shaped material curves had on the local and global behaviour. The results of this subsidiary parametric study showed that the global moment capacity was essentially independent of the shape of the material curve (the ratio of the peak moment from the yield plateau material to the peak moment for the rounded material was 1.018). However, the local critical buckling strain was significantly lower for the specimens analyzed with the material that had the yield plateau (the ratio of the critical strains for the two different material curves was 0.710).

Parametric study of direct filling system of medium-head navigation locks

2021 ◽  
Author(s):  
Tomáš Kašpar ◽  
Pavel Fošumpaur ◽  
Martin Králík ◽  
Milan Zukal
Keyword(s):  
Numerical Modeling ◽  
Parametric Study ◽  
Numerical Models ◽  
Filling Process ◽  
Filling System ◽  
Basic Parameters ◽  
1D Model ◽  
Using Data ◽  
Navigation Lock ◽  
The Impact

AbstractAs part of the research focusing on the safety of vessels during the lockage in navigation locks, two different 1D numerical modeling approaches were tested. These approaches are used to determine the force effects on vessels during the direct filling process of the navigation lock. These numerical models were verified using data measured on a physical model. Using the selected 1D model, a parametric study focusing on the impact of the basic parameters of the navigation lock including the lifting velocity of the gates on the maximum hawser forces was performed. The research has shown that with a suitable design of the upper gate, the direct filling system may also be used for medium-head navigation locks with a normal lift of up to 5 m.

Parametric Study of Static Strength of Multiplanar KK-Joints：Square Chords and Circular Braces

2011 ◽  
Vol 250-253 ◽  
pp. 1527-1532
Author(s):  
Ai Guo Chen ◽  
Wei Liang Huang ◽  
Rui Zeng Shan ◽  
Qing Shan Yang
Keyword(s):  
Parametric Study ◽  
Large Scale ◽  
Failure Modes ◽  
Numerical Models ◽  
Axial Loading ◽  
Steel Structure ◽  
Geometric Parameters ◽  
Truss Structures ◽  
Hollow Section ◽  
Circular Hollow Section

Pre-stressed spatial tubular truss system is adopted in steel roof truss structures of China International Exhibition Center New Venue. Bottom chord joints are multiplanar KK-joints consisting of chord with square hollow section and brace with circular hollow section. However, not only that relatively little research has been carried out on such joints, but also that no detailed design guidance on KK-type joints consisting of chord with square hollow section and brace with circular hollow section can be found Current design code for steel structure (GB 50017-2003). This paper reports the study into the strength of this type of KK-joints under axial loading. The numerical models were adopted, and several various geometric parameters which affect the strength and failure modes, were investigated. It was indicated that the geometric parameters affects significantly the ultimate capacity and failure modes of the joints. The varied relationship of the strength and failure mode with parameter varying was studied in detail. The results of the work presented provide initial discussion on behavior of this type of KK-joints and lay the foundation for a future large-scale parametric study and put out design formula.

scholarly journals A Parametric Study of Blast Damage on Hard Rock Pillar Strength

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1901 ◽  
Author(s):  
Kashi Jessu ◽  
Anthony Spearing ◽  
Mostafa Sharifzadeh
Keyword(s):  
Parametric Study ◽  
Hard Rock ◽  
Numerical Models ◽  
Underground Mines ◽  
Pillar Stability ◽  
Pillar Strength ◽  
Blast Damage ◽  
Rock Pillars ◽  
Economic Standpoint ◽  
Safe Working

Pillar stability is an important factor for safe working and from an economic standpoint in underground mines. This paper discusses the effect of blast damage on the strength of hard rock pillars using numerical models through a parametric study. The results indicate that blast damage has a significant impact on the strength of pillars with larger width-to-height (W/H) ratios. The blast damage causes softening of the rock at the pillar boundaries leading to the yielding of the pillars in brittle fashion beyond the blast damage zones. The models show that the decrease in pillar strength as a consequence of blasting is inversely correlated with increasing pillar height at a constant W/H ratio. Inclined pillars are less susceptible to blast damage, and the damage on the inclined sides has a greater impact on pillar strength than on the normal sides. A methodology to analyze the blast damage on hard rock pillars using FLAC3D is presented herein.

scholarly journals Parametric Study on the Influence of Embedded SPR to the Performance of Square CFST Columns

2020 ◽  
Vol 12 (9) ◽  
Author(s):  
Abdul Azim Abdullah ◽  
◽  
Azrul Abdul Mutalib ◽  
Shahrizan Baharom ◽  
Wan Hamidon Wan Badaruzzaman ◽  
...  
Keyword(s):  
Parametric Study ◽  
Steel Plate ◽  
Numerical Models ◽  
Past Research ◽  
Positive Influence ◽  
Steel Tube ◽  
Element Analysis ◽  
Concrete Core ◽  
Cfst Columns ◽  
Good Agreement

Steel plate reinforcements (SPR) embedded into the concrete core of a concrete filled steel tube (CFST) column is a promising strengthening scheme. However, further study is required to understand the influence SPR on the strength and behaviour of a CFST column. Numerical models of the CFST columns are developed using finite element analysis. The models are verified with experimental results from past research. The models are in good agreement with the experimental study. Then, a parametric study is conducted to investigate the strength and behaviour of CFST columns embedded with various configuration of SPR. In which, the embedded SPR varies in quantity, thickness and height. The parametric study indicates that these factors have positive influence on the performance of the CFST columns. The performance of the columns is measured in terms of strength, stiffness and ductility. Results have shown that the performance of the columns increases with every increment of the quantity, thickness and height of SPR.

Parametric study of resilient response of tracks with a sub-ballast layer

1999 ◽  
Vol 36 (6) ◽  
pp. 1137-1150 ◽  
Author(s):  
J T Shahu ◽  
NSV Kameswara Rao ◽  
Yudhbir
Keyword(s):  
Parametric Study ◽  
Rational Design ◽  
Numerical Models ◽  
Three Dimensional ◽  
Element Model ◽  
Test Results ◽  
Linear Elastic ◽  
Beam Elements ◽  
Track Parameter ◽  
Resilient Response

Formulation of a rational design methodology for laying or upgrading tracks for heavier and faster trains requires investigation of the effect of various track parameters on overall track responses. For this purpose, a three-dimensional linear elastic finite element model, 3D20N, is developed that uses 20-noded brick elements and 16-noded surface elements and models rails as one-dimensional beam elements. Modelling details related to rail elements enable this model to predict the track responses accurately. Assessment of predictive capabilities of the model has been carried out by detailed comparisons with other numerical models and measured field test results. A detailed parametric study of the track responses was carried out using this model for a typical track with a sub-ballast layer and by adopting a practical range of track variables. Subgrade modulus was found to be the most influential track parameter on the overall track responses. The next most important track parameters were depth of sub-ballast, rail moment of inertia, and tie spacing. Practical implications of predicted parametric trends are discussed.

scholarly journals Bearing Capacity of Single Pile-Friction Wheel Composite Foundation on Sand-over-Clay Deposit under V-H-M Combined Loadings

2021 ◽  
Vol 11 (20) ◽  
pp. 9446
Author(s):  
Yikang Wang ◽  
Xinjun Zou ◽  
Jianfeng Hu
Keyword(s):  
Bearing Capacity ◽  
Parametric Study ◽  
Numerical Models ◽  
Design Procedure ◽  
Composite Foundation ◽  
Soil Conditions ◽  
Single Pile ◽  
Centrifuge Testing ◽  
Vertical Loading ◽  
Potential Factors

This paper presents numerical modelling to investigate the bearing capacities and failure mechanisms of single pile-friction wheel composite foundation in sand-overlying-clay soil conditions under combined V-H-M (vertical-horizontal-moment) loadings. A series of detailed numerical models, with validations of centrifuge testing results, are generated to explore the potential factors influencing the bearing capacity of this composite system. Intensive parametric study is then performed to quantify the influences of the foundation geometry, soil properties, sand layer thickness, pre-vertical loading and lateral loading height on the failure envelopes in the V-H-M domain. Last but not least, an empirical design procedure is proposed based on a parametric study to predict the bearing capacity of this composite foundation under various loading conditions, which can provide guidance for its design and application.

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