| Offshore platform crane is an indispensable important equipment for normal production and life. Each platform is equipped with one or two crane. According to statistics, the number of the offshore platform crane in the sea of china is more than200now, and most of them are lattice crane. Ensure running safely and effectively is platform staffs concerns. On the one hand, it must have the ability to hoist load ratings, namely it must meet strength requirements; On the other hand, requires crane does not occur fatigue failure in life expectancy. This topic focuses on research of strength and fatigue property of the crane. And intensity check and residual life assessment of the crane serviced in LD10-1CEP platform in Bohai sea has been carried on.This paper optimized the finite element model of the crane. Using the equivalent triangle to simulate the wire rope pulley system. The axial force change rules of the boom and the wire rope pulling force change rules with the boom angle was analyzed by using the simplified model of the crane boom. And by using the finite element method, the vertical spring rate and dynamic coefficient of the crane has been calculate. Load calculation has been done in dangerous condition at different angles. With the ANSYS analysis software the stress regularity of crane under different angles is analyzed and the danger positions of the crane have been found out. By comparing the literature and research, found a method to evaluate fatigue residual life of the lattice crane in service. 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 is17years. |
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