中文摘要：

本文分别采用二进制的对称分组和自由分组两种编码方法,基于改进的遗传算法（MGA）和有限元分析软件SAP2000API接口开发了一种面向偏心结构中阻尼器快速优化布置的平台,推导了拟合中国规范标准反应谱生成人工地震动记录的方法,提出了两种为抑制偏心结构扭转效应而设计的评价函数。首先,与穷举法结果比较,通过逐步积分法,验证了该优化平台对于L型偏心结构中,给定数目软钢阻尼器位置优化结果的可靠性和高效性;然后,引入两个性能评价指标,通过数值分析,研究了影响偏心结构中阻尼器位置优化的不同因素。结果表明：评价函数的设计和编码方法对阻尼器优化影响较大,场地地震动输入会影响阻尼器的位置优化与编码方法的选择相关,同一编码,影响不大;力学参数的改变不影响阻尼器的位置分布,但软钢阻尼器初始刚度的提高会降低中上部楼层的减震效果。本文研究方法可为同类结构中阻尼器快速优化布置提供借鉴。

英文摘要：

Based on the modified genetic algorithm and finite element software（SAP2000）,a joint optimizational gorithm with coding method of symmetric block and free block is put forward to optimize the location of given number metallic damper in eccentric structure,two types of evaluation function were proposed to reduce the response of torsional vibration.Firstly,comparing with the result of exhaustive method,stepby-step time history analysis of L-shaped eccentric structure under the excitation of the artifical earthquake ground motions compatible with standard response spetra were carried out to prove the reliability and the efficiency of the optimization algorithm mentioned above.Secondly,two new indices were brought forward to estimate the factors which influnce on optimizing the location of the dampers.It is found that evaluation,function and coding method can dramaticaly change the location of damper,categories of ground motion is related to coding method to affect the optimizing result,and the mechanical parameters of metallic damper has no influnce on it.If increasing the stiffness of the metallic damper,the response of torsional vibration in the upper floor will be reduced.The method in this paper could provide reference to location optimization for the damper in similar structure.