The Research On Optimization Design Of Crane Girder Based On Finite Element

Bridge crane is absolutely necessarily equipment in our national construction and development of economy,and the bridge is the main load bearing components of the bridge crane, however, it is a problem that the bridge crane is metal structure is bigger in size and the material is wasted. Applying the finite element method to the design of bridge crane will furthest improve the design efficient and reduce production cost.This thesis chooses the box girder of the16t crane as the research object, on the basis of further study of the finite element theory and parametric technology, a finite element analysis and optimized in structure is established for the bridge structure of bridge crane,on the basis of that,it provides some guiding and reference results. The main work is as follows:(1)The structure of bridge is researched.The reasonable constraints are determined via checking calculation of strength and stiffness for the main beam. The parametric model of bridge is established by using PRO/E software.Parametric model is improve design efficiency and is the basis of optimized design.(2)Through the static analysis on the structure of bridge crane by the finite element software of ANSYS, the rule of the distributing in the two stages are calculated when the trolley with different working condition. By calculating,the max stress is56.267Mpa and132.16Mpa all less than the allowable stress,the max deflection is5.35mm and17.021mm all less than the allowable deflection.The structural design safety.(3)Through the modal analysis and dynamic properties on the structure of bridge crane by the finite element software of ANSYS, the dynamic characteristic is calculated when the trolley with full load is in the middle of the span. The lowest natural frequency is6.4736Hz attain the requirements.The dynamic properties show the crane have a good deflection and working well.(4)Through the optimization analysis module of ANSYS, aiming at the crane mass be the most least, satisfying the body’s requests in the direction and strength, the paper proceeded optimization to the box-crane of bridge crane. The mass of crane reduce24.5%over the original.