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Nonlinear Analysis Of Piles With Application Of Offshore Tower Response, Nagger Mohamed El
Nonlinear Analysis Of Piles With Application Of Offshore Tower Response, Nagger Mohamed El
Digitized Theses
Three main areas are addressed in this study: (1) Statnamic test analysis. In recent years a new type of pile test employing a short-duration load was developed that became known as pile Statnamic test. A method of dynamic analysis has been formulated for this test. The aim of the analysis is twofold: to calculate the pile head displacements in such a way that a satisfactory match with the data measured during the test is obtained; and using the model parameters established from this comparison to predict the pile capacity. The model is one-dimensional and accounts for slip and energy dissipation …
Dynamic Analysis Of Turbine-Generator-Foundation Systems, Weiming Liu
Dynamic Analysis Of Turbine-Generator-Foundation Systems, Weiming Liu
Digitized Theses
In this dissertation a comprehensive investigation on the dynamic characteristics of turbine-generator-foundation systems is performed. All the major components of the system, including turbine-generator casing, shaft, rotors, journal bearings, deck, piers, foundation mat, piles, and soil medium, have been included. Full interaction between the turbine-generator set, the foundation superstructure, and the soil medium, is considered.;A hybrid method is proposed to establish the mathematical model for the turbine-generator-foundation system, which includes finite element discretization of turbine-generator and foundation superstructure, combined with a soil stiffness matrix derived from the dynamic Green functions of the soil. The soil is modeled as a transversely …
Dynamic Analysis Of Single Piles And Pile Groups, Hazem Gamal El-Marsafawi
Dynamic Analysis Of Single Piles And Pile Groups, Hazem Gamal El-Marsafawi
Digitized Theses
The determination of stiffness and damping of piles is an important step in the analysis of pile-supported structures subjected to dynamic loading.;The first part of this study examines the use of approximate methods to evaluate the impedance functions of single piles and pile groups. The group impedances derived from the superposition of the two-pile solution are compared with those obtained from direct analysis. Good agreement is observed for floating piles in homogeneous and nonhomogeneous soil profiles. An extensive set of dynamic pile-soil-pile interaction factors is presented in a form suitable for interpolation. An approximate approach for the evaluation of pile-group …
Analysis Of Initial Stresses, Long Term Deformation And Rock Lining Interaction In Tunnels, Ashraf Mohamed Hefny
Analysis Of Initial Stresses, Long Term Deformation And Rock Lining Interaction In Tunnels, Ashraf Mohamed Hefny
Digitized Theses
For the design of underground structures in rocks, the initial stresses in the rock mass are a pre-requisite for any analysis. The hydraulic fracturing technique is the only practical method for determining these initial stresses at great depth. For vertical fractures, existing solutions for calculation of stresses are satisfactory. For horizontal or mixed-mode fractures, appropriate solutions are required.;Closed-form solutions for horizontal and mixed-mode fractures including strength anisotropy are developed and applied to several case histories. The reinterpreted horizontal stresses agreed with results derived from convergence measurements and they are also consistent with field observations of excavation performance, indicating that the …