Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 135 for “"numerical analyses"”.
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Numerical analyses of the long term behavior of enhanced geothermal system (EGS)
… are revisited, improved and supported with numerical models. Eighteen different models are developed using COMSOL, a finite element numerical modeling environment, based on the three study variables, i.e., production rate, number and pattern of boreholes, and thermal properties of rock, to …
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Numerical analyses of long carbon fiber reinforced concrete panels exposed to dynamic loading
… fiber reinforced concrete experimentally and numerically. Experimental tests were conducted on plain concrete (PC), reinforced concrete, and four different types of long carbon fiber reinforced concrete (LCFRC). The results from each test were then compared to one another. This comparison …
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Numerical analyses of the effectiveness of secondary tailgate support systems: a stability approach
A numerical model was developed to analyze the effectiveness of active and passive secondary support systems on the stability of a retreating longwall tailgate opening. The range of loading conditions that any tailgate can be subjected to was identified to form the basis of numerical modeling. The …
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Rolling-Ball Rubber-Layer system for the lightweight structures seismic protection: experimentation and numerical analyses
… dynamic behaviour of the system itself through numerical analyses and parametric experimentations, with the goals to get a sufficient comprehension of the system performance and its general numerical characterization. The device, invented by Alan Thomas at TARRC (“Tun Abdul Razach Research …
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Performance of Improved Ground and Reinforced Soil Structures during Earthquakes – Case Studies and Numerical Analyses
… laboratory testing of soils, seismic analysis, numerical modeling, and other analytical work.
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Thermal Response of Integral Abutment Bridges With Mse Walls: Numerical Analyses and a Practical Analysis Tool
… During this research, over 65 three-dimensional numerical analyses were performed to investigate and quantify how different structural and geotechnical bridge components behave during thermal expansion and contraction of the bridge deck. In addition, separate three-dimensional numerical models …
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Response of Pile-Supported T-Walls to Fill Loading and Flood Loading Based on Physical Model Studies and Numerical Analyses
… for validating and calibrating corresponding numerical models. The numerical models were developed following a rigorous modeling approach and using rational and reasonable assumptions based on widely-accepted and well-justified procedures. The numerical model results were in good agreement …
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Microgrid-Enabled Reactive Power Support to Enhance Grid Economics
… determine this capability curve. The results of numerical analyses of this proposal show how the reactive power behaves under gradual changing of real power generation in a microgrid and how these two outputs are correlated. This model is further integrated into an optimal power flow problem to …
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Modelling and simulation of a pressure swing reactor
… This thesis uses a combination of analytical and numerical analyses on a mathematical model of the PSR to characterise the units general behaviour under various conditions.
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Finite Element Modeling and Structural Behavior of Concrete Tunnel Linings
… tunnel linings is obtained through a series of numerical analyses of the ground-lining interaction problem with emphasis on nonlinear lining behavior. A rational analysis approach is recommended for linings in rock and soil that will include the nonlinear effects and interaction in a realistic …
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Seismic analysis of a large size underground cavern
… earthquake loads. In this thesis, analytical and numerical analyses of circular tunnels subjected to different types of waves are firstly performed. Then a systematic approach for the dynamic analysis of large size underground openings such as powerhouses and hydroelectric caverns is presented.
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Irregular Welded Rectangular Hollow Section Truss-type Connections
… type of connection was mainly investigated using numerical methods, with finite element models validated against experimental tests that were performed by either the author or other researchers. Design recommendations are proposed based on the numerical results. In addition, a numerically based …
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Stability of Embankments Founded on Soft Soil Improved with Deep-Mixing-Method Columns
… is that design is based on deterministic analyses of settlement and stability, even though deep mixed materials are highly variable. Conservative deterministic design procedures have evolved to limit failures. Disadvantages of this approach include (1) designs with an unknown degree of …
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Análise de aberturas subterrâneas circulares pelo método dos elementos finitos
… openings under plane-strain conditions. The numerical analyses are carried out by means of Finite Element Method (FEM) the quadratic isoparametric element being used. Linear and bi-linear elastic behaviours are assumed. Soils heterogeneity and sequential excavation are taken into account. The …
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Visualization in Geomechanics With an Application to Deep Excavations
… explores the behavior of deep excavation numerical analyses, with the aid of the visualization techniques presented herein. First, a 2D plane strain excavation analysis is explored. Second, a 3D linear excavation is modeled using a variety of excavation techniques. Finally, a 3D excavation …
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Critical height and surface deformation of column-supported embankments
… and reinforcement stiffnesses. Three-dimensional numerical analyses were conducted to model the experiments. The critical heights calculated using the numerical model agreed with the experimental results. The results of the laboratory tests and numerical analyses indicate that critical height …
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Improving CPT-Based Earthquake Liquefaction Hazard Assessment at Challenging Soil Sites
… are proposed. Furthermore, a framework for numerically simulating CPTs in interlayered soil profiles using the Material Point Method (MPM) is developed. A framework for linking uncertainties associated with the numerical analyses and the laboratory CPT calibration chamber tests used to …
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Numerical Analysis of Multi-Functional Surface Acoustic Wave Sensor
… parameters and selected material properties, numerical analyses are performed using COMSOL Multiphysics to validate the theoretical results. Various postprocessing responses of the propagated SAWs in both time and frequency domains, such as time delay, insertion loss, and frequency shift, are …
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Wave induced response of sea floor deposits : a simple model for sands and nonlinear analysis by FEM
… One important conclusion obtained from the numerical analyses is the influence of the coefficient of permeability on the susceptibility of the sand mass to liquefaction; for high values of permeability even a loose sand mass need not liquefy. This is in direct contrast to the commonly held …
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