Mechanics Performance Testing And Optimization Of Semi-Rigid Structures Of Large Storage Racks

Large steel storage racks have been widely used in modern logistics.With rapid development of domestic warehousing market,safety and stability have become prominent problem in storage racks’ design.Beam-column combination and base plate assemblies are important semi-rigid structures of storage racks,they have great effects on the safety of whole structure.At present,Most storage racks are designed by experience and not manufactured scientifically.In practical work,due to the diversity,nonlinear and stiffness discrete feature of the structure,it’s difficult to be analyzed in theory.So European standards recommend that these should be researched by experiment.Therefore,the testing device of the semi-rigid structures was designed to test the mechanical performance of storage racks.Combined with finite element analysis,more comprehensive,accurate and efficient mechanical properties of shelves were acquired,which will greatly improve the safety,stability of storage racks.This article made the following aspects of the research work:(1)The testing method of the semi-rigid structures of storage racks was researched according to the European Shelves design standards.And the devices was developed independently to test the mechanics performance of the semi-rigid structures.The moment-rotation(M-θ)curves and stiffness characteristic values of the semi-rigid structures were acquired.(2)The analysis software of mechanics performance was developed by virtual instrument and DAQ technology.The functions of data acquisition,signal preprocessing,data storage and calculation was realized.It can accomplish the comprehensive analysis of the semi-rigid structures.(3)The finite element model of the base plate assemblies was established and experiments was simulated by FEA technology.The results about FEA and experiment were compared,which shows that finite element simulation results have a great consistency with the semi-rigid characteristic values of experiment.and the relative error of them less than 12.8%.(4)Spoke width and thickness of base plate assemblies was optimized design.The reasonable combination size was achieved and the stiffness value was improved by 9.68%in the volume of material constant cases.(5)The reliability mode.FMEA were researched and applied in Shelf System.Meanwhile the failure mode of shelf system was analyzed,then the RPN and CA value was calculated.Therefore,these provide a basis for the design and manufacturing of storage racks.