[1]施明征,涂永明,王志兰.悬挂建筑结构原型模型的随机振动优化[J].东南大学学报(自然科学版),2012,42(6):1157-1163.[doi:10.3969/j.issn.1001-0505.2012.06.025]
 Shi Mingzheng,Tu Yongming,Wang Zhilan.Stochastic vibration optimization of prototype model of suspended building structure[J].Journal of Southeast University (Natural Science Edition),2012,42(6):1157-1163.[doi:10.3969/j.issn.1001-0505.2012.06.025]
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悬挂建筑结构原型模型的随机振动优化()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
42
期数:
2012年第6期
页码:
1157-1163
栏目:
土木工程
出版日期:
2012-11-20

文章信息/Info

Title:
Stochastic vibration optimization of prototype model of suspended building structure
作者:
施明征1 涂永明2 王志兰2
1 东南大学建筑设计研究院, 南京 210096; 2 东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096
Author(s):
Shi Mingzheng1 Tu Yongming2 Wang Zhilan2
1 Architectural Design and Research Institute, Southeast University, Nanjing 210096, China
2 Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
悬挂建筑结构 原型模型 随机振动 白噪声
Keywords:
suspended building structure prototype model stochastic vibration white noise
分类号:
TU973
DOI:
10.3969/j.issn.1001-0505.2012.06.025
摘要:
以随机振动为基础,将白噪声作为地面加速度激励,进行悬挂建筑结构原型模型的动力响应优化分析.研究了无约束(即不限制悬挂次结构阻尼比ξ2的上限值)条件下悬挂建筑主结构的最优调谐比fopt、次结构最优阻尼比ξ2,opt、主结构加速度响应方差χa1和主结构位移响应方差χx1等参数与悬挂质量比μ之间的关系,以及在约束(即限制ξ2的上限值)条件下,χa1和fopt与μ之间的关系.结果表明:对具有大悬挂质量比(μ≈1)的悬挂建筑的主结构加速度响应方差进行无约束优化分析时,可以近似假定ξ1=0来求解fopt和ξ2,opt; 而对相对位移响应方差优化,采用该假定将带来显著的误差甚至是错误,无约束条件下,χa1随着μ的增大而不断改进.约束优化分析表明,ξ2的上限越大,则χa1和χx1均越小.为了保证悬挂建筑结构的整体动力稳定性,不需要对主结构设置阻尼器,但需要对悬挂次结构(悬挂楼层)设置阻尼器.
Abstract:
On the basis of stochastic theory, the optimization of dynamic responses of prototype model of suspended building structure was carried out using white noise as ground vibration input. The relationships between four parameters, i.e. the optimal tuning ratio of main structure of building structure fopt, the optimal damping ratio of auxiliary structure ξ2,opt, the acceleration response variance of main structure χa1 as well as the displacement response variance of main structure χx1, and the suspended mass ratio μ were analyzed in the case of the unconstrained optimization where the upper limit value of the damping ratio of auxiliary structure ξ2 is not limited. Moreover, the relationship between χa1 and μ as well as that between fopt and μ were analyzed in the case of constraint optimization where the upper limit value of ξ2 is limited. The results show that: the damping ratio of main structure can approximately be assumed as zero, i.e. ξ1=0, to solve foptand ξ2,opt in the case of the unconstrained optimization of acceleration response variance of main structure of suspended building with the inherent large suspended mass ratio(μ≈1); however, this assumption could bring large error or even be a mistake in the case of the optimization of displacement response variance. Under the condition of unconstrained optimization, χa1 improves with the increase of μ. Moreover, under the condition of constraint optimization, the larger the upper limit value of ξ2 is, the smaller the χa1 and χx1 are. The dampers should not be installed in the main structure but it is needed in the auxiliary structure or in the suspended floors to ensure the global stability of suspended building structure under dynamic excitation.

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备注/Memo

备注/Memo:
作者简介: 施明征(1964—),男,高级工程师,Shimingzheng5182@sina.com.
引文格式: 施明征,涂永明,王志兰.悬挂建筑结构原型模型的随机振动优化[J].东南大学学报:自然科学版,2012,42(6):1157-1163. [doi:10.3969/j.issn.1001-0505.2012.06.025]
更新日期/Last Update: 2012-11-20