TMD-基礎(chǔ)隔震混合控制體系隨機響應(yīng)分析*
杜永峰1'2， 王亞楠1， 李 慧1'2
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杜永峰1'2， 王亞楠1， 李 慧1'2(1蘭州理工大學防震減災(zāi)研究所，蘭州730050; 2蘭州理工大學西部土木工程防災(zāi)減災(zāi)教育部工程研究中心，蘭州730050)[摘要] 當建筑物遭受強地震動時，某種單一的減隔震手段已經(jīng)不能確保建筑物的安全，因此有必要采用一些新的減隔震策略。將減震與隔震技術(shù)聯(lián)合起來進行控震是一種可行的混合控制措施，目前對其減震效果的研究多集中于確定性地震動作用下，但眾所周知地震動本質(zhì)上是一隨機運動過程。本文將地震動考慮為一平穩(wěn)隨機過程，建立了混合控制體系在平穩(wěn)隨機地震動作用下的運動方程，然后運用狀態(tài)空間法對該體系進行隨機響應(yīng)求解，得到其響應(yīng)功率譜和響應(yīng)的均方根值，分析結(jié)果表明：該混合控制措施可以有效地減小結(jié)構(gòu)的地震響應(yīng)；對于位于不同的場地上的結(jié)構(gòu)，該混合控制體系仍能發(fā)揮一定的減震效果。[關(guān)鍵詞] 混合控制體系；隨機響應(yīng)；功率譜；均方根中圖分類號：TU311.3 文獻標識碼：A 文章編號：1002-848X(2012) S2-0338-04Stochastic response analysis of hybrid control system of TMD-Base isolationDu 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
