Calibration of a Jackup Structural Analysis Procedure Using Field Measurements From a North Sea Jackup

1990 ◽  
Author(s):  
J.N. Brekke ◽  
R.B. Campbell ◽  
W.C. Lamb ◽  
J.D. Murff
Keyword(s):  
Structural Analysis ◽  
North Sea ◽  
Field Measurements ◽  
Analysis Procedure

Optimal Design of Composite Lightweight Rollers

1993 ◽  
Author(s):  
K. Bellendir ◽  
Hans A. Eschenauer
Keyword(s):  
Structural Analysis ◽  
Shell Theory ◽  
Analytical Procedure ◽  
Mathematical Optimization ◽  
Optimization Methods ◽  
Analysis Procedure ◽  
Various Boundary Conditions ◽  
Evaluation Models ◽  
Laminate Theory ◽  
Static Behaviour

Abstract A well-aimed layout of fibre-reinforced lightweight rollers does not only require an efficient structural analysis procedure but also the application of structural optimization methods. Therefore, an analytical procedure is introduced for the calculation of the static behaviour of cylindrical shells subject to axisymmetric and/or nonaxisymmetric loads. In the scope of this procedure, arbitrary, unsymmetrical laminates as well as various boundary conditions will be considered. Basis is the shell theory by Flügge enhanced by anisotropic constitutive equations (material law) in the scope of the classical laminate theory. By means of mathematical optimization procedures we then determine optimal lightweight rollers, using different design and evaluation models. For that purpose, coated and uncoated roller constructions as well as hybrid types made of CFRP/GFRP will be applied. Concluding, we will discuss possible improvements and advantages of anisotropic lightweight rollers in contrast to isotropic ones made of steel or aluminium.

scholarly journals Structural analysis of the Smeaheia fault block, a potential CO2 storage site, northern Horda Platform, North Sea

2020 ◽  
Vol 121 ◽  
pp. 104598
Author(s):  
Mark Joseph Mulrooney ◽  
Johnathon Lee Osmond ◽  
Elin Skurtveit ◽  
Jan Inge Faleide ◽  
Alvar Braathen
Keyword(s):  
Structural Analysis ◽  
North Sea ◽  
Co2 Storage ◽  
Storage Site ◽  
Fault Block

scholarly journals Structural analysis of the Rubjerg Knude Glaciotectonic Complex, Vendsyssel, northern Denmark

2005 ◽  
Vol 8 ◽  
pp. 1-192 ◽  
Author(s):  
Stig A. Schack Pedersen
Keyword(s):  
Structural Analysis ◽  
North Sea ◽  
Hanging Wall ◽  
Ice Sheet ◽  
Proximal Part ◽  
Thrust Fault ◽  
The North ◽  
Thrust Sheets ◽  
The North Sea ◽  
Fault Deformation

Pedersen, S.A.S. 2005: Structural analysis of the Rubjerg Knude Glaciotectonic Complex, Vendsyssel, northern Denmark. Geological Survey of Denmark and Greenland Bulletin 8, 192 pp. The Rubjerg Knude Glaciotectonic Complex is a thin-skinned thrust-fault complex that was formed during the advance of the Scandinavian Ice Sheet (30 000 – 26 000 B.P.); it is well exposed in a 6 km long coastal profile bordering the North Sea in northern Denmark. The glaciotectonic thrust-fault deformation revealed by this cliff section has been subjected to detailed structural analysis based on photogrammetric measurement and construction of a balanced cross-section. Thirteen sections are differentiated, characterising the distal to proximal structural development of the complex. The deformation affected three stratigraphic units: the Middle Weichselian arctic marine Stortorn Formation, the mainly glaciolacustrine Lønstrup Klint Formation and the dominantly fluvial Rubjerg Knude Formation; these three formations are formally defined herein, together with the Skærumhede Group which includes the Stortorn and Lønstrup Klint Formations. The Rubjerg Knude Formation was deposited on a regional unconformity that caps the Lønstrup Klint Formation and separates pre-tectonic deposits below from syntectonic deposits above. In the distal part of the complex, the thrust-fault architecture is characterised by thin flatlying thrust sheets displaced over the footwall flat of the foreland for a distance of more than 500 m. Towards the proximal part of the complex, the dip of the thrust faults increases, and over long stretches they are over-steepened to an upright position. The lowest décollement zone is about 40 m below sea level in the proximal part of the system, and shows a systematic step-wise change to higher levels in a distal (southwards) direction. The structural elements are ramps and flats related to hanging-wall and footwall positions. Above upper ramp-hinges, hanging-wall anticlines developed; footwall synclines are typically related to growth-fault sedimentation in syntectonic piggyback basins, represented by the Rubjerg Knude Formation. Blocks and slump-sheets constituting parts of the Lønstrup Klint Formation were derived from the tips of up-thrusted thrust sheets and slumped into the basins. Mud diapirs are a prominent element in the thrust-fault complex, resulting from mud mobilisation mainly at hanging-wall flats and ramps. Shortening during thrust-fault deformation has been calculated as 50%. Only about 11% of the initial stratigraphic units subjected to thrust faulting has been lost due to erosion. The thrust-fault deformation was caused by gravity spreading of an advancing ice sheet. Overpressured mud-fluid played an important role in stress transmission. The average velocity of thrust-fault displacement is estimated at 2 m per year, which led to compression of a 12 km stretch of flat-lying sediments, c. 40 m in thickness, into a thrust-fault complex 6 km in length. The thrust-fault complex is truncated by a glaciotectonic unconformity, formed when the advancing ice sheet finally overrode the complex. When this ice sheet melted away, a hilland- hole pair was formed, and meltwater deposits derived from a new ice-advance (NE-Ice) filled the depression. The NE-Ice overran the complex during its advance to the main stationary line situated in the North Sea. When this ice in turn melted away (c. 19 000 – 15 000 B.P.), the glacial landscape was draped by arctic marine deposits of the Vendsyssel Formation (new formation defined herein).

Restoration and Structural Analysis of an Irregular Byzantine Monument – A Discussion on a Simplifying Analysis Procedure

2021 ◽  
pp. 418-430
Author(s):  
Styliani Papatzani ◽  
Nikolaos Pnevmatikos ◽  
Eleni Zarogianni ◽  
Konstantinos Dimitroulias ◽  
Georgios Tzamalis ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Analysis Procedure

Structural Analysis of a Flange Coupling without Clearance

2013 ◽  
Vol 371 ◽  
pp. 652-656
Author(s):  
Danut Zahariea
Keyword(s):  
Numerical Analysis ◽  
Structural Analysis ◽  
3D Model ◽  
Analysis Procedure ◽  
Failure Conditions

In this paper the flange coupling without clearance will be analyzed using CATIA Generative Structural Analysis workbench. The structural analysis procedure will be presented: creating the 3D model, configuring the mesh, applying the restraints, applying the loads (torque), applying the interaction conditions (driving flange-bolts and nuts, bolts and nuts-driven flange), running the numerical analysis and results visualization. Two different systems will be analyzed: the first is a six bolts flange coupling working in nominal conditions, the second is a five bolts flange coupling working in some failure conditions with only five bolts distributed in a six holes flange coupling. In certain conditions the flange coupling design allows the same torque to be transmitted by six, but also by only five bolts. However, the non-uniformity of the five bolts distribution around the six holes flanges will generate some other unwanted phenomena. In this case all the stress and deformations will be non-symmetrically and for the flange coupling that is a rotating coupling this can be one reason for beats phenomenon.

A Modal Analysis Procedure for PWR Fuel Assemblies

2008 ◽  
Author(s):  
Le´o A. Carrilho ◽  
Jayme P. de Gouveˆa
Keyword(s):  
Structural Analysis ◽  
Modal Analysis ◽  
Natural Frequencies ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Analysis Procedure ◽  
Normal Operation ◽  
Spacer Grids ◽  
Assembly Design ◽  
Fuel Assemblies

The analysis of vibration effects on the structure of Nuclear Fuel Assemblies was performed by using a 3-D finite element model. A 16×16 Standard Fuel Assembly design was used for this analysis. Since fuel assemblies have a nonlinear behavior during normal operation, due to the interaction between fuel rods and spacer grids, the methodology consisted basically of four steps: a modal analysis for obtaining the natural frequencies, a linear structural analysis for the no sliding stiffness calculation, a nonlinear structural analysis for the sliding stiffness calculation, and a correction factor estimate for natural frequencies obtained directly from the modal analysis. Also, it includes the major calculated stresses associated with the most external thimble tube.

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