Stress Analysis and Optimization Design of Bridge Crane Main Beam

To further improve the structural performance of the 32/5t-10.5m double girder bridge crane, the optimal size design of the main beam is sought. The main beam of the bridge crane is taken as the optimization object, and stress analysis is conducted on multiple load cases to identify critical points. The goal is to achieve the best structural quality of the bridge crane while ensuring its stiffness performance. Topology optimization design is performed using a multi-objective genetic algorithm and response surface analysis is employed to optimize the thickness of the left and right web plates of the main beam. By comparing the stress analysis results before and after the reconstruction of the main beam, it is found that the reconstructed main beam has a 19.8% reduction in weight while meeting the strength and stiffness requirements. This achieves the objective of simplifying the structure, reducing weight, and lowering manufacturing costs.