Abstract
In this paper, the hot spot stress method was applied to the life assessment of offshore platform lattice crane in service for the first time. The research of residual life of crane was carried out for the problems such as long service time and poor working condition. Taking a platform crane in Bohai Sea for example, the finite element analysis was carried out and drew a conclusion that the danger zone was at the bottom of A-frame and boom. The stress test was taken using strain gauge measuring method under different working conditions to acquire the hot spot stress of the danger zone. According to usage record on the spot, more accurate statistics has been gathered to obtain practical cycles of the crane. Using hot spot stress method and Miners linear accumulative theory to evaluate the residual life of the crane successfully. The residual life of the crane is 17 years.
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