Determination of optimal safety factors for tubular Y- joint of jacket-type offshore platforms based on reliability analysis

Tubular joint is one of the most sensitive parts of jacket structure. Lack of enough accuracy in its design would lead to irreparable damage to the entire structure.Given the uncertainties in the manufacturing process, parameters such as resistance and load are structural members of random variables and cannot have absolute safety (zero failure probability).Therefore, the standard design should have a performance with a reasonable probability of failure. Reliability analysis is the ability of the structure to perform its design objectives specified in the lifetime of the structure. Failure of large structures, such as jacket platforms, often happens in welded tubular joints.Therefore, estimating the reliability of offshore platform joints that involve different failure modes is important and necessary. Depending on the linearity or non-linearity limit of the state function, diffrent methods of analysis are used.One important application of reliability methods is to calibrate the safety factor in the design process to achieve a sustainable level of safety. Considering the approach of calibration code, the probability of failure or safely level of the structure can be restricted

Keywords:

Reliability , Safely factors , Tubular joints , Code calibration