Dynamic Analysis And Reinforcement Optimization Design Of Reinforced Concrete Frame Factory Building

In recent years,with the rapid industrial development and land resource shortage,industrial factories are built in multilayer structure,at the same time,causing vibration problem of industrial factory,especially resonance problem of equipment and plant,not only affects safety of structures and equipment,but also threaten safety of people's life and property.Aiming at the problem of abnormal vibration of a multilayer reinforced concrete frame industrial factory,based on field dynamic test,combined with ANSYS finite element numerical simulation,the natural vibration characteristics and abnormal vibration causes were analyzed,the optimal design was studied,main research results and conclusions are as follows:(1)According to different working conditions of machine equipment,field vibration test was carried out,based on field test data,spectrum analysis of industrial factory abnormal vibration was made by Matlab software,natural frequency of the longitudinal and transverse directions of the structure were 2.94Hz and 2.45Hz,the range of vibration frequency of equipment were 2.093?2.21Hz,5.197?5.326Hz,experiment results show that the abnormal vibration of industrial factory was caused by resonance.(2)Built ANSYS finite element model,and carry out modal analysis,theoretical analysis results and field dynamic experiment results were compared,the results show that finite element model has high precision and can be used for dynamic analysis and optimization design of industrial factory,according to modal parameters,the results showed that deficiency of stiffness is also an important factor for the abnormal vibration of industrial factory.(3)Based on field dynamic experiment results,the equivalent excitation of the equipment was applied to finite element model for transient dynamic analysis,the ratio of theoretical response values to measured response values is in the range of 0.72?1.06,the results show that the finite element model and vibration source selection were accurate,which provide a basis for effect evaluation of strengthening optimization design.(4)According to the vibration characteristics of industrial factory,effect of production equipment and restrictions were considered,the reinforcement method of adding additional shear wall was adopted,volume of shear wall was selected as objective function,longitudinal and transverse thickness of shear wall was taken as design variables,natural frequency was selected as state variables,optimization analysis and sensitivity analysis of vibration reinforcement finite element were made,the results showed that the reinforcement volume of shear wall was greatly reduced,the first three frequencies of industrial factory were increased by 57.54%,74.29%and 95.85%,dynamic response of industrial factory was decreased on varying degrees,the vibration damping effect of reinforcement scheme was good.