巨型框架多功能减振结构的参数优化  

Parameters optimization of the multifunctional vibration-absorption megaframe structures

作　　者：杨坚 邹宏德 

机构地区：[1]广州珠江外资建筑设计院,广东广州510060

出　　处：《四川建筑科学研究》2007年第4期159-162,186,共5页Sichuan Building Science

摘　　要：巨型框架多功能减振结构体系具有调频质量减振、基础隔震和阻尼耗能减振等多种减振功能。本文作者研究了巨型框架多功能减振结构的参数优化问题。在结构布置方案确定的情况下,影响主、次框架减振效果的主要因素是调谐比和隔震层的阻尼比。针对调谐比和阻尼比的参数优化问题,提出了分步优化方法。第一步,对隔震次框架的自振频率进行优化;第二步,对不满足约束条件的情况,调整隔震层的阻尼比,以达到满足优化目标和约束条件的要求。对白噪声作用下所得到的优化方案的时程分析表明,时程分析结果与优化结果是一致的。The parameters optimization of the multifunctional vibration-absorption megaframe structures, in which the isolated minorframes act as mass dampers,base isolaters and damping energy-dissipaters,is studied. In ease of the specified layout of the controlled megaframe structure, the main parameters, which influence on the controlled efficiency, are the frequency tuned ratio and the damping ratio of the isolation layer. In this paper,the two-steps optimization method of the controlled megaframe is developed. Firstly,the tuned ratios are optimized; secondly, the damping ratios of the isolation cushions are modified to satisfy the objective functions and the constrained functions. The numerical example shows that the results of the time-step analysis agree with the optimization results under the excitation of the white noise.

关 键 词：多功能减振 巨型框架结构 参数优化 分步优化 

分 类 号：TU399[建筑科学—结构工程]