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中文標題: 結構自體調諧質量阻尼系統之耐震行為研究
英文標題: Seismic Behavior of Structures with Building Mass Damper Systems
編號: NCREE-12-002
語言: 中文
編輯:
媒體型式: 紙本
作者:
張國鎮   汪向榮   李柏翰   簡亭宜   陳穎萱   
中文摘要: 隔震技術目前發展逐漸成熟,因應經濟發展與土地取得不易等因素,
除了基礎隔震設計迅速發展外,中間樓層隔震設計因施工便利性且較易滿
足建築上的特殊考量與功能需求等多項優點,使用案例亦日益廣泛,利用
隔震技術可延長隔震層上方結構之自然週期,以有效降低其受震反應。對
應於隔震設計,調諧質量阻尼器設計能夠有效控制主結構物在外力擾動下
之反應,調諧質量通常遠小於主結構質量,其目前主要仍以考慮控制風力
振動之應用為主。
本研究欲提出一結合隔震設計與調諧質量阻尼器設計之優化自體調諧
質量阻尼系統,將隔震層上方結構作為自體調諧質量,隔震層可提供此自
體調諧質量阻尼器之勁度與阻尼比,利用此一優化設計同時降低隔震層上、
下方結構之受震反應。因此,首先以一簡化三自由度結構模型模擬自體調
諧質量阻尼系統,進行各項結構系統參數之敏感度分析,探討相關參數變
異之敏感度,並建議一優化自體調諧質量阻尼系統設計方法,此一設計方
法亦可解決目前中間樓層隔震設計中忽略隔震層下方結構勁度對於隔震層
上方結構隔震效益之影響。此外,以現有縮尺試驗構架進行相關設計與數
值分析,數值模型包含採用優化與非優化設計進行結構物動力特性及耐震
行為探討,並比較各項參數變異對於其受震反應之影響。最後,以國家地
震工程研究中心既有結構物進行優化與非優化自體調諧質量阻尼系統設計
之實例分析研究,將實際工址量測之地震紀錄進行分析,以討論自體調諧
質量阻尼系統在實際設計之可行性,以及實際工址地震特性對於自體調諧
質量阻尼系統之影響。
英文摘要: In a mid-story isolated building, the isolation system is incorporated into the mid-story rather than the base of the building. The effectiveness of mid-story isolation design in reducing seismic demands on the superstructure above the isolation system has been verified in many researches. It was also disclosed, however, that the significant seismic responses at the substructure below the isolation system and a significant phase lag between the seismic responses of the superstructure and substructure should be paid more attention. It is particularly true when the isolation system is installed at a higher story or the substructure is not sufficiently stiff. Observed from the past researches and practical applications, the adoption of tuned mass damper (TMD) design can effectively enhance the seismic-resistant capability, in addition to the wind-resistant capability, of the building, especially for high-rise buildings. The additional tuned absorber mass is in general much smaller than the building itself mass and is installed on the top of the building, namely the main structure or the substructure. Although an increase of the tuned absorber mass results in a better dynamic control performance for the main structure, it also leads to an immense increase of damping demand for TMD design. Therefore, this study aims to incorporate the TMD design concept into a mid-story isolated building, in order to effectively control the dynamic responses of both the superstructure and substructure. This new structural design method, denoted as building mass damper (BMD) design, can essentially combine the advantages of mid-story isolation design and TMD design methods for seismic protection of building structures. In a building structure using BMD design, the superstructure serves as a tuned absorber mass whose stiffness and damping can be provided by the isolation system composed of elastomeric bearings and additional dampers. In that case, the size limitation for the tuned absorber mass of conventional TMD design can be easily overcome. By means of a simplified three-lumped-mass structural model in which three lumped masses are assigned to the superstructure, isolated layer and substructure, the influences of different parameters of interest on the dynamic characteristics of a building structure with the BMD system are analytically investigated in a sensitive analysis manner. The objective function to determine the optimum design parameters for the BMD system is that three modal damping ratios which are dominant respectively for the superstructure, isolated layer and substructure in the direction of interest are important and should be taken as an approximately equal value. Based on the sensitive analysis results, it is seen that the BMD design concept is doable with an acceptable damping ratio demand. Furthermore, the suitable occasions to apply mid-story isolation design, TMD design and BMD design are defined explicitly. A preliminary BMD design procedure with an iteration process is also proposed. A scaled down test model and a practical structural model (i.e. National Center for Research on Earthquake Engineering) using different design methods (including conventional design, mid-story isolation design, TMD design and BMD design) are numerically studied. The numerical results indicate that the BMD system with optimum design parameters can effectively reduce the seismic responses of both the superstructure and substructure.
關鍵字: 自體調諧質量阻尼器、調諧質量阻尼器、中間樓層隔震、敏感度分析、優化設計、數值分析
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