Fatigue And Ultimate Strength Analysis Based On CSR For Double Hull Oil Tankers

The Common Structural Rules have been developed in response to a consistent and persistent call from industry for an increased standard of structural safety, which have been entered into force since 1st April, 2006. The rules for oil tank with double shell were jointly developed by Lloyd's Register (LR), American Bureau of Shipping (ABS) and Det Norske Veritas (DNV). The fatigue strength assessment and hull girder ultimate strength are two important issues of structure design verification in Common Structure Rules. In this paper, the method of fatigue strength assessment and hull girder ultimate strength in the rules were studied. The prime goal of this paper is to enhance the practicability of the rules and study its assessment method. The paper makes emphasize research on items in hereinafter.1) The analysis process of fatigue strength assessment method in Common Structure Rules for Double Hull Oil Tankers was studied, and a systemic discussion about its technical gist was made.2) In order to enhance the practicability of the rules, the method about loads calculate and loading automatically was studied, which based on VC++ and PCL. The method beseem to CSR hot pot stress approach.3) The fatigue analysis for two oil tankers with hot pot stress approach was conducted then the assessment result was analyzed.4) The fatigue analysis for one oil tanker with CSR nominal stress approach, CCS fatigue assessment rules, DNV fatigue assessment rules was conducted.5) The theoretical base of fatigue strength assessment in CSR was studied.6) CSR hull girder ultimate strength approach was studied.