An Improved Simulated Annealing Algorithm Applied To The Wind-Induced Vibration Reduction Of Spatial Reticulated Structures

With the developing of material and spirit civilization of human, large-span spatial structure is commonly used in modern buildings and has become the symbol of one country's strength in science and technology. However, the light self-weight, large flexibility, small damp and low natural vibration frequency make it very sensitive to wind load, resulting in some accidents. So, it is of great significance to find out an economic, efficient and reliable method to reduce the wind-induced vibration in large-span spatial structures.An improved simulated annealing algorithm is put forward based on simulated annealing algorithm and other classical optimal algorithm in this thesis for optimization of damper quantity and placement in vibration reduction of spatial reticulated structures under wind load. Two typical reticulated shell structures under different impact loadings are taken as examples to demonstrate the advantages of the improved algorithm with proper parameters. It is more efficient than original simulated annealing algorithm and can be used to different spatial structures.Based on harmony superposition method, time history of wind speed of the joints of sample shells is simulated and translated as time history of wind load. The time history analysis is done for each shell example with optimal position and amount of dampers under wind loads, and the result is accordant with the theory. A simple and convenient method is put forward which can replace the wind road for optimization of damper quantity and placement in vibration reduction of spatial reticulated structures.