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Paper Information

Title: 

INVESTIGATION ON THE FATIGUE RELIABILITY OF OFFSHORE PLATFORMS

Type: PAPER
Author(s): SHABAKHTY NASER*
 
 *UNIVERSITY OF SISTAN AND BALUCHESTAN
 
Name of Seminar: INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS) PORTS & MARITIME ORGANIZATION
Type of Seminar:  CONFERENCE
Sponsor:  PORTS AND MARITIME ORGANIZATION
Date:  2010Volume 9
 
 
Abstract: 

INTRODUCTION: THE OBJECTIVE OF STRUCTURAL CODES IS TO GUIDE THE PROPER DESIGN AND CONSTRUCTION OF OFFSHORE PLATFORMS MEETING FUNCTIONALITY, SAFETY AND ECONOMICAL ASPECTS. THEY ARE CLOSELY CONNECTED TO EACH OTHER AND AN ITERATIVE PROCEDURE IS NECESSARY TO ACHIEVE AN OPTIMAL DESIGN. THE CONSEQUENCES OF FAILURE CONCERN THE SAFETY OF HUMANS, POLLUTION, AND THE COST OF STRUCTURES AND EQUIPMENT. THEREFORE, THE ASSESSMENT OF THE SAFETY OF OFFSHORE PLATFORMS INCLUDING JACK-UP PLATFORM BECOME ESSENTIAL.
TIME-VARYING NATURE OF ENVIRONMENTAL LOADS SUCH AS WAVE AND WIND WILL CAUSE FLUCTUATION OF STRESSES IN STRUCTURAL COMPONENTS OF PLATFORMS. THE FATIGUE DAMAGE IS A DETERIORATION PROCESS, WHICH ARISES FROM FLUCTUATION OF STRESS, AND SHOULD BE EVALUATED BEFORE REACHING A CRITICAL LEVEL. TRADITIONALLY, FATIGUE HAS NOT BEEN CONSIDERED AS AN IMPORTANT PROBLEM IN JACK-UP PLATFORMS. THE MAIN REASON WAS THE MOST PLATFORMS WERE DESIGNED IN AREAS WITH LOW OR MODERATE ENVIRONMENT CONDITIONS. RECENTLY, BY USING JACK-UP PLATFORMS IN REGIONS WITH MORE SEVERE SEA STATES OR AS PERMANENT PLATFORMS, THE FATIGUE DAMAGE BECOMES AN IMPORTANT FACTOR IN EVALUATING THE INTEGRITY AND SAFETY OF THE STRUCTURES.

 
Keyword(s): FATIGUE, RELIABILITY, GEOMETRY FUNCTION, BENDING TO MEMBRANE STRESS RATIO
 
 
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