摘要
本文基于改进的遗传算法(MGA)和有限元分析软件SAP2000 API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,提出了两种为抑制偏心结构扭转效应而设计的评价函数,分别采用了二进制的对称分组和自由分组两种编码方法,基于拟合标准反应谱生成的人工地震动记录,首先与穷举法结果比较,验证了该优化平台对于偏心结构中、给定数目粘滞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,研究了对偏心结构中阻尼器位置优化产生影响的不同因素。结果表明:评价函数的设计和编码方法的选择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,且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,但粘滞阻尼器阻尼系数和阻尼指数取值适中,可以兼顾层间位移角最大楼层和结构总体反应两个方面的减震效果。
Based on the Modified Genetic Algorithm and finite element software （SAP2000API）,a joint optimizational gorithm is put forward to optimize the location of given number metallic damper in eccentric structure,two types of evaluation function are proposed to reduce the response of torsional vibration.Firstly,comparing with the result of exhaustive method,sep-by-step time history analyses with coding mehods of symmetric block and free block under the excitation of the artifical earthquake ground motions compatible with standard response spetra are carried out to prove the reliability and the efficiency of the optimization algorithm mentioned above.Secondly,two new indices are put forward to estimate the factors which influnce 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 are related to coding method to affect the optimizing result,and the mechanical parameters of metallic damper have no influnce on it.The values of damping coefficient and damping index will benefit for local and global response of the eccentric structure.
出处
《工程抗震与加固改造》
北大核心
2014年第2期1-7,47,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金面上项目(51178100)
