Analytical Method for Geometric Nonlinear Problems Based on Offshore Derricks

The marine derrick sometimes operates under extreme weather conditions, especially wind; therefore, the buckling analysis of components in is one critical contents engineering safety research. This paper aimed to study local stability and propose an analytical method for geometrically nonlinear problems. rod simplified as a compression with simply supported ends, which subjected transverse uniform load. Considering second-order effect, differential equations were used establish deflection, rotation angle, bending moment lateral was defined method. Moreover, deflection deformation members analyzed, practical calculation formula obtained. Ansys results compared this paper.