Research On Optimization Of Damper Arrangement In Vibration Reduction Of Long-span Spatial Structures Based On Improved Antcolony Optimization

In this thesis,the dampers arrangement optimization problem of vibration reduction of long-span spatial structures is mainly studied.The ant colony optimization algorithm is studied,and the specific introduction and improvement methods are proposed,which are applied to the problem of the optimal damper arrangement in two types of typical spatial grid shell structures.The feasibility of the improved ant colony algorithm to solve such problems is confirmed and the thesis also explores the optimal number of damper arrangements.Finally,the simulated wind load obtained under the wind engineering simulation method is loaded on the optimization results of the ant colony algorithm.The time-history analysis of the dynamic response of the structure is carried out to further verify the effectiveness and computational efficiency of the improved ant colony optimization algorithm.The thesis completed the following specific work:(1)Several optimization algorithms commonly used in computational science to solve discrete stochastic optimization problems are extensively investigated.Compared with their respective characteristics,ant colony optimization(ACO)algorithm is selected and studied in depth.According to its shortcomings as well as the characteristics of spatial structure dampers optimal arrangement,the thesis presents improved ant colony optimization algorithm.(2)Applying the central impact load to the two typical spatial grid shell structures,the improved ant colony optimization algorithm is used to solve the optimal position of the damper arrangement in this loading case,and study the optimal number of damper arrangement exploratoryly.(3)Wind engineering methods is learned from to simulate the wind speed time-history of structural surface nodes and then to simulate the wind load.Simulated wind loads are applied to the spatial grid shell structures which has adopted the optimized damper arrangement.The dynamic response time-history of structural vibration is analyzed and the vibration reduction effects of different optimizations are compared,so as to put forward some suggestions on the actual design.