Research On Optimization Design And Finite Element Analysis Of Metal Structure Of DP60/30B Bridge Erection Machine

The bridge erection machine is a large-scale hoisting and transportation equipment that erects prefabricated concrete beams on the piers in turn by using their own lifting devices.The construction method using prefabricated segment beams not only ensures the quality of the concrete beams,but also avoids damage to the road caused by excessive weight of the concrete beams during the transport of the beams.The bridge erection machine has the advantages of short construction period and small impact on the traffic under the bridge,and thus plays an increasingly important role in the construction of roads and bridges.The DP60/30 B bridge erection machine was regarded as the research object in this paper.The ANSYS parametric modeling technology was used to establish the parametric model of the whole metal structure of the bridge erecting machine,and thus the rapid modification and analysis of the bridge machine model under different working conditions can be achieved.Through the research on the construction process of the bridge erection machine,the finite element calculation and analysis were performed for the typical working conditions of the erecting beam,the passing span and the non-working state,and the safety of the various structures of the bridge bridge crane was examined.The mathematical model of the optimization of the girder was established by studying the structure of the girder.The multidisciplinary optimization software ISIGHT integrated with ANSYS was used to establish the optimization platform.The multi-island genetic algorithm was used as the optimization method and the optimization command stream file was run in ANSYS.Finally,the optimization design of the sections of bridge girder was realized.A total of 112 feasible solutions were obtained from the optimization results,of which the optimal solution reduced the girder volume by 16.5%,ie,the weight was reduced by 19.91 t,which accounted for 6.55% of the total weight of the bridge erection machine.SolidWorks was used to establish the solid model and assembly model for the main structures of the spreader and suspension equipment.Workbench was used to carry out finite element analysis on long hanger,short hanger,and spreader under their respective working conditions and the safety performance of each structure was checked.To find the local area where stress concentration occurs by checking the stress cloud diagram,and take corresponding measures to reduce the stress peak value.