The Jou, Tzu-wang creator Wireland, Martin Chairperson Hasegawa Akio Examination Committee Suphat Vongvisessomjai Examination Committee BES Engineering Corporation, R. 0. C., Scholarship Donor text th Bangkok Asian Institute of Technology 1987 monographic eng

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77 p. A procedure is developed for assessing the reliability of jacket offshore structures, in conditions where they will suffer fatigue damage. A typical fixed steel offshore platform installed in the Taiwan Strait under the dynamic actions of wind, waves, currents, and earthquakes is investigated. The wave action is modelled as an ergodic Gaussian process with narrow-band characteristics using JONSWAP spectra . The wave spectra are modified t o include effects of currents, and wind action is assumed as a percentage of wave action. The corresponding wave force spectra are determined by Airy's linear wave theory. The wind velocity distribution at the site is represented by a Weibull distribution. Earthquake action is considered as a wide band zero mean ergodic Gaussian process with finite duration, in which Tajimi's power spectra are used. Earthquake and wave actions are the main actions considered for the fatigue analysis. Fatigue failure according to Miner's model is computed, in which accumulation of fatigue damage is linear. A lognormal format is used for analysing the fatigue reliability employing the first-order second-moment reliability method. The system reliability is determined by modelling the structure as a combination of series and parallel systems, in which the redundancy of the structural system is assumed as of standby type . A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1987 Offshore structures Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B19357 http://203.159.5.9/ait-thesis/detail.php?q=B19357 300798 20260818175929.0