الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
 |  | from | 264 |  |  |
| | | from | 264 | | |
Abstract
Offshore structures are subjected to various environmental loading conditions such as wind, waves and currents which have severe effects on those structures. Assessment of the strength of existing offshore platforms is important especially if platform life extension and additional loads or conductors are required.
API guidelines have evolved significantly over the years, particularly guidelines related to the procedure of wave and current calculations. This thesis presents two case studies of assessment of aged platforms which were installed in the late 1960s in the Suez Gulf, Egypt A 3D finite element model (SACS) was used to perform in-place static analysis. Assessment of the platform strength using procedures of old editions and the latest API edition was performed. Intensive parametric study was conducted to investigate the effect of wind speed, wave height and associated wave period, current velocity and marine growth on the response of the platform jacket and piles.
It was found that the obtained results, using the API 21st edition, are less conservative compared to the API 19th edition. Also, variation in wave heights, current velocity and marine growth affects significantly the platform response and the minimum factor of safety of foundation piles. Accurate estimation of met ocean data especially wave and current design conditions and measurements of marine growth play a major role in determining the strength of the platform and the possibility of platform upgrade.