Optimal Design Of Self-centering Damper Arrangement Based On Coarse-grained Master-slave Parallel Genetic Algorithm

The optimal design of the damper arrangement on the energy dissipation structure can give full play to Energy-dissipating Capacity of the damper,improve seismic response reduction of the damper,and reduce economic costs.The traditional genetic algorithm can optimize the position of the damper on the structure with a single objective.Nondominated sorting genetic algorithm-II(NSGA-II)can optimize the position of the damper on the structure with a multi-objective.The parallel genetic algorithm can combine the fast parallelism of the computer and the natural parallelism of genetic algorithms to improve the optimization speed and accuracy.The thesis combines nondominated sorting genetic algorithm-II and parallel genetic algorithm to optimize the number and position of dampers on the frame structure.There are engineering application reference value for the algorithm and the results of the calculation examples.The main work is as follows:(1)The coarse-grained master-slave parallel genetic algorithms is used to optimize the position of dampers on the frame structure by taking the inter-story drift angle as the control objective.The algorithm implementation process is as follows: first,a population is divided into several sub-populations,and then each sub-population independently complete the operation of genetic algorithm in parallel.If the migration cycle is reached,the sub-populations perform the migration operation.After the migration is completed,each sub-population independently complete the operation of genetic algorithm in parallel again.Finally,the coarsegrain-master-slave parallel genetic algorithm is used to optimize the position of dampers on a 12-layer steel frame structure,compared with the results by genetic algorithm and the structure with the dampers placed in every two storeys.Next,the effectiveness of the algorithm is evaluated from the perspectives of the shock absorption rate,accuracy,and computational efficiency.(2)A coarse-grained-master-slave parallel genetic algorithm with NSGA-II embedded is proposed to optimize the position of dampers on the structure by taking the inter-story drift angle and floor acceleration as the control objective.The algorithm implementation process is as follows: first,a population is divided into several sub-populations,and then each subpopulation independently complete the operation of Nondominated sorting genetic algorithmII(NSGA-II)in parallel.If the migration cycle is reached,the sub-populations perform the migration operation.After the migration is completed,each sub-population independently complete the operation of NSGA-II in parallel again.The main steps of NSGA-II: Pareto principle,fast non-dominated sorting,congestion calculation,elite retention strategy.The principle and algorithm implementation of these main steps are introduced.Finally,the coarsegrained-master-slave parallel genetic algorithm with NSGA-II embedded is used to optimize the position of dampers on a 12-layer steel frame structure,and the seismic reduction rate of inter-story drift angle and floor acceleration are calculated.(3)To achieve simultaneous optimization of the number and position of dampers on the structure.First,an improved coarse-grain-master-slave parallel genetic algorithm is used.The algorithm is divided into two parts: coarse-grain-master-slave parallel genetic algorithm is used internally.With a fixed number of dampers,optimization of the position of the damper by taking a single-objective.The number of dampers is cyclically optimized externally.Next,an improved coarse-grained-master-slave parallel genetic algorithm with NSGA-II embedded is proposed.The algorithm is divided into two parts: coarse-grained-master-slave parallel genetic algorithm with NSGA-II embedded is used internally.With a fixed number of dampers,optimization of the position of the damper by taking Multi-objective.The number of dampers is cyclically optimized externally.Finally,these two algorithms are used to optimize the number and position of dampers on a 12-story steel frame structure,and give suggestions on the arrangement of dampers on the 12-story frame structure.