基于遗传算法的位移型与速度型阻尼器位置优化比较研究

Comparison of optimal placement of displacement-based and velocity-based dampers using genetic algorithm

提出了一种基于遗传算法的阻尼器位置优化的新型优化数学模型,考虑地震作用下不同的结构控制指标,首先假定优化模型的五种加权系数组合,在阻尼器数量一定的前提下,对不同形式的结构在四类场地条件地震动作用下分别进行位移型和速度型阻尼器位置优化。然后引入两个性能评价指标,对五种系数组合情况时两种类型阻尼器布置下的结构反应进行分析研究,使阻尼器布置方案能体现综合控制效果上的最优,得到不同情况下加权系数的最佳取值组合。通过数值分析,比较了不同类型阻尼器的位置优化特点,为工程实际应用中不同类型阻尼器的位置优化目标函数选取提供了有益的参考。

A new mathematic model of location optimization for passive devices was established and three response control indices about storey-drift angle, storey-displacement and acceleration were considered in this model. Firstly, five combination modes of these indices were presented. This paper dealt with the optimal placement of disp acement-based and velocity-based dampers respectively on the premise that the number of dampers was fixed for several building models with different number of storeys and ground motions at four types of sites. Secondly, two new indices were brought forward to estimate the optimal combination mode of coefficients for two kinds of the dampers under different conditions, which can generally express the best response control. Some numerical examples were illustrated to verify effectiveness and feasibility of the new mathematic model, in which a genetic algorithm was used. At last, the optimal placements of two kinds of dampers were compared and some significant conclusions were given.