杜永峰1'2，  王亚楠1，  李  慧1'2

(1兰州理工大学防震减灾研究所，兰州730050; 2兰州理工大学西部土木工程防灾减灾教育部工程研究中心，兰州730050)

 

[摘要] 当建筑物遭受强地震动时，某种单一的减隔震手段已经不能确保建筑物的安全，因此有必要采用一些新的减隔震策略。将减震与隔震技术联合起来进行控震是一种可行的混合控制措施，目前对其减震效果的研究多集中于确定性地震动作用下，但众所周知地震动本质上是一随机运动过程。本文将地震动考虑为一平稳随机过程，建立了混合控制体系在平稳随机地震动作用下的运动方程，然后运用状态空间法对该体系进行随机响应求解，得到其响应功率谱和响应的均方根值，分析结果表明：该混合控制措施可以有效地减小结构的地震响应；对于位于不同的场地上的结构，该混合控制体系仍能发挥一定的减震效果。

[关键词] 混合控制体系；随机响应；功率谱；均方根

中图分类号：TU311.3    文献标识码：A  文章编号：1002-848X(2012) S2-0338-04

 

Du Yongfeng1'2,Wang Yananl, Li Hui1,2

(1 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology,  Lanzhou 730050, China; 2 Westem Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China)

 

Abstract: When building is subjected to strong ground motion, a single vibration absorption or isolation method cannot ensure its safety.  It's necessary to use some new vibration control strategies. A technique that combining vibration absorption with vibration isolation is an practicable hybrid control method.  Most of studies about the vibration absorption effect of this hybrid control method are under the deterministic earthquake excitations, while as we all know earthquake ground motion is stochastic process. By considering earthquake ground motion as stationary stochastic process, the motion equation of the hybrid control system is established, the stochastic response of this system is solved, and afer that the response power spectrum and root-mean-square are obtained using state-space method in this paper. The analysis results indicate that this hybrid control method can reduce structural seismic response effectively.

Keywords: hybrid control system; stochastic response; power spectrum; root-mean-square