偏心结构非线性黏滞阻尼器位置优化的遗传算法求解  

Optimal Distribution of Viscous Damper for Eccentric Structure by Genetic Algorithm

作　　者：乌兰[1] 李爱群[2] 沈顺高[3] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]东南大学土木工程学院,江苏南京210096 [3]中国航空工业规划设计研究院,北京100011

出　　处：《沈阳建筑大学学报（自然科学版）》2014年第2期201-208,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金面上项目(51178100)

摘　　要：目的研究遗传算法在偏心结构中非线性黏滞阻尼器位置优化的应用问题,通过与穷举法结果比较,验证了该优化方法的可行性.方法分别采用了二进制的对称分组和自由分组两种编码方式,基于改进的遗传算法(MGA)和有限元分析软件SAP2000API开发了一种面向偏心结构中阻尼器快速优化布置的平台.推导了基于拟合标准反应谱生成的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,然后引入两个性能评价指标,进行了大量逐步积分数值分析.与穷举法比较验证了该优化平台对于偏心结构中,给定数目黏滞阻尼器位置优化结果的可靠性和高效性.结果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与编码方法的选择相关;力学参数的改变不影响阻尼器的位置分布,但非黏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.结论遗传算法与有限元方法的结合,可以方便快捷地解决偏心结构中阻尼器的位置优化的问题.但评价函数、编码方法以及地震动输入的选择要结合实际工程的需要.The purpose of this paper is to study the Genetic Algorithm（GA）in application of optimizing the location of viscous damper in eccentric structure. With coding method of symmetric block and free Block, based on the Modified Genetic Algorithm（ MFA） and finite element softw are SAP2000API,a joint optimization algorithm is put forw ard to quickly optimize the location of given number biscous damper in eccentric structure. Giving the deducing process of the artifical earthquake ground motions compatible w ith standard response spetra,tw o types of evaluation function are proposed to reduce the response of torsional vibration and tow new indices are brought forw ard to estimate the factors w hich are influenced on optimizing the loca-tion of the dampers a large number of numerical analysis are given. Comparing w ith the result of exhaustive method,step-by-step time history analysis under the excitation of the artificial earthquake ground motions compatible w ith standard response spectra are carried out to prove the reliability and the efficiency of the optimization Algorithm mentioned above. It is found that evaluation function and coding method can dramatically change the location of damper,categories of ground motion is related to coding method to affect the optimizing result,and the mechanical parameters of damper has no influence on it. The centered values of damping coefficient and damping index w ill benefit for local and global response of the eccentric structure. In consideration of coding method,evaluation function,categories of ground motion in engineering,integration of GA and SAP2000API are convenient to optimize the location of viscous damper in eccentric structure.

关 键 词：遗传算法 SAP2000API 黏滞阻尼器 位置优化 

分 类 号：TU352.11[建筑科学—结构工程]