THE EFFECTIVENESS OF THE SLIDING ISOLATORSIN CONTROLLING THE DYNAMIC RESPONSES OF THE JACKET TYPE PLATFORMS

Jack platforms have unique features and it is possible to establish a physical link between an oil platform and the seabed in certain areas such as in shallowwaters. The greatest advantage of these platforms is their stability, and given the connection between these platforms and the seabed, the exertion of thewind and water forces results in the slight displacement of these platforms. The piers and offshore platforms are affected by complex destructive forces of wind, ocean currents, earthquake, and eddies. These forces result in the considerable displacements in the piers or platforms, which harm the safety and serviceability of theoffshore structures in operation. In this research, a hydrodynamics software solution was used to simulate the dynamic interaction between the pierand hydrodynamic forces and to analyze the offshore and structural parameters. The present research objectives were to analyze the sea hydrodynamicparameters and the jacket platform rocking oscillations under the effect of irregular JONSWAP wave torque and to perform a numerical analysis ofthe seismic isolator performance in the process of controlling the dynamic responses of the offshore jacket platforms and the damped vibrations of thejacket-type platforms. The results were indicative of the effect of the sliding isolator on the offshore jacket platforms and its contribution to the decrease in the platforms and its contribution to the decrease in the effect of vibration caused by waves and other dynamic forces on the superstructure. The sliding isolators considerably increase the energy dissipation capacity without considerably increasing the system hardness and the seismic rehabilitation of the structures is carried out through reducing the lateralearthquake and wind loads.