Optimal Design Of Bias-rail Box Girder With Corrugated Web For Bridge Crane

The corrugated web has outstanding stability.Through the research and application analysis of the corrugated web,it is introduced into the design of the bias-rail box girder,and the bias-rail box girder with corrugated web applied to the bridge crane is obtained.Then,the girder is optimized using the improved continuous domain ant colony algorithm.The parameter setting of the bias-rail box girder with corrugated web is discussed by the method of optimization design,which has reference value for the design and research work of box corrugated web beam.The main research contents of this paper are as follows:(1)Analyze the characteristics of various corrugated webs,and select trapezoidal corrugated webs,then the key mechanical properties of trapezoidal corrugated webs was analyzed and summarized.For a straight web bias-rail box girder produced by a company as the prototype,the more conservative dimensional parameters were chosen to design the bias-rail box girder with corrugated web for bridge crane.(2)Based on the optimization of the size of the box-shaped corrugated web beam,the ant colony algorithm based structural optimization design method is studied.Based on the analysis of the continuous domain basic ant colony algorithm,it is found that this algorithm has poor ability of local exploration,imperfect constraint processing,etc.,so the introduction of pseudo-random proportional rule to improve the seed solution selection method,appropriate random disturbance of the pheromone distribution center,the standard deviation of the pheromone distribution is modified,direct comparison and proportion maintenance dealing with constraints is used to improve the continuous domain ant colony algorithm.The superiority of the improved continuous domain ant colony algorithm is verified by an optimization example.(3)A mathematical model for the optimization of the size of the corrugated web beam is established,which is optimized by the improved continuous domain ant colony algorithm.The optimized bias-rail box corrugated web girder has a mass reduction of 18.75%compared to the initial bias-rail box corrugated web girder,which is 9.75%lower than the straight-web biased box girder.The optimization process effectively reduces the weight of the grider.The mechanical properties of the straight-web biased box girder and the optimized bias-rail box corrugated web girder are verified by finite element simulation.The statics analysis shows that both meet the strength and static stiffness requirements of the design,and the performance comparison close;through linear buckling analysis,both of them meet the stability requirements,and the stability of the optimized bias-rail box corrugated web girder is obviously better;through the modal analysis,both first-order modal frequencies meet design requirements.