The Optimization Of Mr Dampers On The Wind-Induced Vibration Reduction Of Spatial Reticulated Structures

Large-span spatial structure is commonly used in modern buildings. The light self weight, large flexibility, small damp and low natural vibration frequency make it very sensitive to wind load. It is necessary to find out an economic, efficient and reliable method to reduce the wind-induced damage in such structures. MR dampers can be used to reduce the wind-induced vibration in large-span spatial structures. However, the high expenses of MR dampers were the main reason that only few of spatial reticulated structures used them.The improved Genetic Algorithm is used to find out the optimal position and amount of dampers applied on wind-induced vibration reduction of spatial reticulated structures. The APDL program was worked out to execute the improved genetic process and two typical spatial reticulated shells were taken as examples. The efficiency and precision of the improved genetic algorithm were verified. The optimized placement and amount of dampers were found out.Based on harmony superposition method, time history of wind speed of the joints of sample shells was simulated and translated as time history of wind load. The time history analysis was done for each shell example with optimal position and amount of dampers under wind loads. The research results of this paper could be used as reference in design of reticulated structures considering wind-induced vibration reduction.