Rapid Modeling And Optimization Of Thin - Walled Box Girder Structure Of Bridge Crane

Overhead crane is widely used in various fields of economic construction. The demand for cranes increases and the performance requirements are higher. At present, most enterprises of our country still use two-dimensional engineering drawings in crane design and the intuition of this method is poor which makes the errors hard to be found. Now 3D CAD software become an indispensable part for product design. This kind of software is easy to find and modify the errors and shortens the design cycle at same time. Some softwares have numerical analysis like finite element method which improves the accuracy and efficiency of the product design. These are in line with the current development trend of China’s crane industry product design methods.This paper makes analysis and research on the mechanical properties of shell box beam structure. Based on Visual Basic 6.0, study second development of 3D design software Solid Works. The parametric modeling design and assembling of the main beam and end beam of overhead crane are done. These steps complete quick and accurate design of shell welding beam structure.The software developed in this paper just need the necessary parameters for overhead crane. After inputting these parameters in the visual interface, this software could automatically generate three-dimension model and it will be imported into the ANSYS Workbench to analysis if the model can satisfy the requirement of the construction. In this paper, using 320 t overhead crane as an example, make a comparison between the static analysis result for full load, truck braking working condition and lifting the full good in mid-span working condition.With the results of the analysis for the two conditions to check the static strength and static stiffness of the structure. With the modal analysis, the first four order modal inherent frequencies and modal figure of the structure can be got. The local buckling form can be obtained after analyzing the crane girder structure stability. Reinforced floor can be designed reasonably with the analysis of structure stability. Finally, in order to reduce the quality of the main girder, the optimization design is done in this paper. Engineer examples show that, the design method used in this paper is a practical and effective method to realize rapid and accurate design of crane structure.