...Jeom Kee Paik; Jung Min Sohn The primary objective of the present paper is to examine the effects of welding residual stresses on ultimate strength of high tensile steel plates under axial compression in terms of their magnitude and pattern. The ANSYS nonlinear finite element method is employed...

... is presented. This study is based on a structure that is being applied by the Norwegian fish farming industry today. The floater is made of steel cylinders that are configured as a square. The formulation for the wave loading is based on a combination of potential theory and horizontal drag forces...

...Mateusz Graczyk; Torgeir Moan Sloshing in LNG membrane tanks may cause large pressures on the tank structure. To keep the cargo at the required low temperature, the tank structure is covered with an insulation, which has a much less strength than steel. The containment system is a very complex...

...Rafael L. Tanaka; Clóvis de A. Martins This paper addresses the use of optimization techniques in the design of a steel riser. Two methods are used: the genetic algorithm, which imitates the process of natural selection, and the simulated annealing, which is based on the process of annealing...

... shows that there are very few results within this range and none on combined stability. The current paper aims to fill this gap. Combined stability plot, sometimes called interactive stability plot, is obtained for mild steel models. Most attention is given to buckling caused by a single type of loading...

... of embedded suction anchors are described. Details of the construction and installation of embedded suction anchors, as well as the field proof test results are also discussed. A total of ten steel embedded suction anchors were manufactured and installed successfully. Installation of embedded suction anchors...

...Arman U. Ahmed; Sreekanta Das; J. J. Roger Cheng Steel pipelines, buried in cold regions, often respond to thermal strains and/or geotechnical movement caused by factors such as thaw settlement, frost heave, and slope instability. These complex field conditions can impose large displacements...

... damping coefficient, and the distribution of dampers along the height of the structures under various sea states. A four legged steel jacket platform in a water depth of 122 m is considered as an example problem for finding out the controlled responses. Three wave conditions are considered, namely...

... aim of improving the understanding and assessment of the early stages of environment assisted cracking. There is an industry need for a better understanding of material behavior under these conditions and for the development of a more robust assessment methodology. API 5L X65 pipeline steel parent...

...Roberto Montes-Iturrizaga; Ernesto Heredia-Zavoni; Francisco Vargas-Rodríguez; Michael Havbro Faber; Daniel Straub; Juan de Dios de la O The present paper introduces a general framework for integrity management of offshore steel jacket structures allowing for the risk based planning of inspections...

...Ernesto Heredia-Zavoni; Francisco Silva-González; Roberto Montes-Iturrizaga The probability of failure of steel jacket platforms subjected to fatigue damage is computed by means of Monte Carlo simulations using limit state functions in which wave, wind, and deck loadings are expressed in terms...

...Jan Dührkop; Jürgen Grabe This paper contains several investigations on the behavior of bulged piles. Bulge means the application of vertical steel plates somewhere near the ground surface to improve the lateral bearing capacity. The results of small scale tests in sand are illustrated, which...

...Stephen J. Maddox This paper presents a critical review of current design methods, including their background and relevant experimental data, for assessing the fatigue performance of steel fillet welds with respect to failure in the weld throat. The main focus is on fillet or partial penetration...

...Stephen J. Maddox; Julian B. Speck; G. Reza Razmjoo Increasing deep-water oil and gas recovery has highlighted the need for high integrity, high fatigue performance girth welds in steel catenary riser systems. Such systems include girth welds made from one side. However, the widely used fatigue...

... offshore steel jacket structures in the Danish part of the North Sea. The study includes a sensitivity analysis performed for the identification of relevant generic parameters such as the bending to membrane stress ratio, the design fatigue life, and the material thickness. Based on the results...

...Naoki Fukuda; Naoto Hagiwara; Tomoki Masuda To investigate the mechanical properties of pipeline subjected to plastic deformation, tensile tests and crack-tip-opening displacement (CTOD) tests were conducted on X60, X65, and X80 line pipe steels with uniaxial tensile or compressive prestrain, ε pr...

... statistical uncertainties. The conclusion is that better modeling is required and that this involves much better understanding of the factors influencing marine corrosion. These factors are reviewed briefly, with particular emphasis on marine immersion corrosion of mild steel. Contributed by the OOAE...

...Ge Wang This paper reviews some recent studies on the plastic behavior of steel plates subjected to large impact loads. This is an important topic for risk assessments and safety evaluations because of the ever heightened public concern about safety of marine structures and potential harm...

.... Associate Editor: M. Toyoda 03 April 2001 23 July 2001 plastic deformation fracture toughness pipeline processing steel failure (mechanical) ductile fracture modelling Pre-Strain Fracture Toughness Line Pipe Mechanical Damage Permanent plastic deformation, or pre...

... November 1999 structural engineering standards oil technology petroleum industry design engineering calibration steel For several decades a large number of offshore platforms were designed to the guidelines in the RP 2A published by the American Petroleum Institute 1...