Abstract: By measuring and counting the long axis and short axis of several groups of poultry eggs,the geometric characteristic parameters of poultry eggs were obtained.By analyzing the moment of inertia of the bionic egg section and the traditional rectangular section,the bionic egg box girder with the same section moment of inertia as the rectangular box girder was designed. Meanwhile,the bending performance and anti-buckling ability of the two types of box girder were analyzed by finite element method. The relationship between the mechanical properties and geometric characteristic parameters of two kinds of box beams was obtained. Finally,the main beam of gantry crane was redesigned according to the geometric characteristics of egg shape,and the stiffness and strength of the two main beams in dangerous working conditions were analyzed. Through the application of gantry crane main beam,it is proved that the bionic egg-shaped box girder has similar structural mechanical properties as the traditional rectangular box girder,while its weight is 11.11 % lighter than that of the traditional rectangular box girder.

Key words: bionic egg-shaped box girder, moment of inertia, light weight