Study On Design Optimization Of Key Structure Of Vertical Lifting Stereo Garage

In recent years,China’ s car ownership has shown an increasing trend year by year.Under the existing land resources,the continuous growth of car ownership is bound to exacerbate the shortage of parking spaces.How to alleviate the shortage of parking spaces has attracted more and more attention from the society.Mechanical stereo garage has efficient utilization of land resources,so the establishment of intelligent stereo garage has become one of the important ways to alleviate the parking gap,and has been popularized in many first-tier cities in China.In this paper,the tower-type stereo garage and the large-car-box stereo garage in the vertical lifting stereo garage are taken as the research objects.The transverse mechanism,the lifting mechanism of the tower-type stereo garage and the transporter in the large carbox stereo garage are carried out for structural optimization.The single point response spectrum analysis method is used to analyze the seismic performance of the steel structure frame of the tower-type stereo garage.The specific research contents include the following aspects:Firstly,according to the initial design data and relevant standards,the load of each optimized structure under the most dangerous working condition is calculated,and the free attenuation vibration phenomenon that may occur in the working process of the lifting platform is analyzed in detail,so as to prepare for the fatigue strength analysis of the weld toe.Secondly,the parametric finite element model of each structural optimization object and the single-point response spectrum analysis finite element model of steel structure frame of tower stereo garage are established by using Workbench platform of large finite element analysis software Ansys.Since the main frame of all structural optimization objects is the thin-walled structure,the structural optimization object adopts the modeling scheme of the finite model of the whole shell element combined with the sub-model of the local solid element.The lifting platform is one more sub-model of the optimization object established by the hot spot stress fatigue strength analysis model.After modeling,the finite element models are solved,and the simulation results are analyzed to prepare for the subsequent structural optimization design,and the seismic performance of the steel structure frame of the tower stereo garage is checked.Then,the mathematical model of structural optimization design for each structural optimization object is established by using the optimization design theory and method.For the implicit constraints in each mathematical model,the approximate model is established by Latin hypercube sampling method combined with kriging model,which is prepared for subsequent optimization.Finally,the genetic algorithm is used to solve the mathematical model of structural optimization design,and the rounding solution method is used to process the discrete variables in the optimal solution.After obtaining the optimal solution that meets the specification,the results are verified to ensure that the optimization results still meet the implicit requirements.After the structure optimization,the total mass of all structures combined is reduced by about 9.18%,and the lightweight design goal is well achieved.The total mass of the lifting platform is reduced by about 7.82%,and the total mass of the carrier is reduced by about 22.25%.However,the total mass of the traverse carrier frame has increased by about 36.01%.Although the mass of the traverse carrier frame has increased,Solve the problem of insufficient stiffness and strength of original structure.