Dynamics of offshore structures under sea waves and earthquake forces

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:449717

Jain, A K ^[1]

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1. Indian Inst. of Tech., New Delhi (India). Dept. of Civil Engineering

The analysis and design of Offshore Structures is a complicated process and requires several assumptions and approximations. The structures have to resist a hostile environment and the loads acting on them in a typical ocean environment are many such as wind, waves, tides, currents, ice, earthquakes, temperature loads, operational loads and so on. It is necessary to design an offshore structure such that it can respond to moderate severe environmental loads without damage and be capable of resisting severe environmental loads without seriously endangering the occupants. In this paper, a study of the dynamic analysis of offshore structures in random seas to inputs of earthquake ground motions is presented. P-M spectrum is used for sea wave representation and the Morison equation defines the wave forcing function. Kanai-Tajimi`s PSDF is used for the ground acceleration due to earthquakes. Response analysis is carried out using the time domain random vibration approach. It has been observed that the hydrodynamic damping is higher in random seas than in still water and sea waves induce a reducing effect on the seismic response.

• OSTI ID: 449717
• Report Number(s): CONF-9606279--; ISBN 0-7918-1490-4
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DAMPING
DESIGN
HYDRODYNAMICS
OFFSHORE PLATFORMS
RESPONSE FUNCTIONS
SAFETY ENGINEERING
SEISMIC EFFECTS
STRESS ANALYSIS
WAVE FORCES