Optimal Retrofit Scheme Of Dampers In One Single Bay Reinforced Concrete Frame Structure

The energy dissipation as one of structure passive control, haves advantages of effective reduction of structural response and easily spreading in engineering. Therefore, many researchers at home and abroad on the energy dissipation doing theoretical analyses and studying on experiments has done a lot of researches, but also made lots of achievements. The energy dissipation has been widely used in the vibration and reinforcement of the seismic damage structure. If the parameters are certain, the damping effect of reinforcement of reinforced concrete structure mainly depends on the installation position and number of dampers.Under guaranteeing the premise of the seismic performance of the structure, how to arrange the number and location of dampers is reasonable and effective, which can reduce the reinforcement cost. So that the damping energy dissipation is a hot issue in the research of seismic design of the structure.This paper study on single bay renforced concrete frame, according to the stress and damage characteristics of single bay frame, using vicous damper reinforcing the single bay frame. Under the different earthquake levels, this paper use improved Fast Not-dominated Sorting Genetic Algorithm(NSGA- Ⅱ) for the single bay frame structure and the reinforcement scheme of how to install the dampers is optimized. The main research and conclusions are as follows:① This paper uses Fast Not-dominated Sorting Genetic Algorithm(NSGA-Ⅱ) which is based on simple genetic algorithm to solve the problem of multi-objective optimization. And making improvements on initialization population, crossover operato r and mutation operator so that it can solve the designated certain gene discrete optimization, and realized it in a general mathematical optimization problems.② In this paper, considering the requirements of structural safety, comfort and economy, using the improved NSGA-Ⅱ to optimize the position of dampers for the single span reinforced concrete frame structure, and discussing the variation of the objective function with changing the number of dampers, getting the more economical optimization position which satisfy the security condition.③ The further study about optimization position of damper is done when the structure is in the elastic-plastic state, and using the result compared with the result of optimization position of damper when the structure is in elastic. The study finds out the structure installing the dampers according to the optimization position result when the structure is in elastic satisfy the requirement of safety under the rare earthquake action; when the number of dampers is certain, the optimization results of elatic structure and elastic-plastic structure are similar, and gets the same installation scheme.