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研究生:翁駿民
研究生(外文):Ueng, Jin Min
論文名稱:不規則樓房受地震作用之系統識別暨減振設計
論文名稱(外文):System Identification and Vibration Reduction of Irregular Buildings Under Earthquakes
指導教授:林其璋林其璋引用關係
指導教授(外文):Rong-Song Chen
學位類別:博士
校院名稱:國立中興大學
系所名稱:土木工程學系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:1
中文關鍵詞:地震工程系統識別被動調諧質量阻尼器扭轉耦合結構
外文關鍵詞:Earthquake EngineeringSystem IdentificationPassive Tune Mass DamperTorsionally-Coupled Structure
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裝設主/被動結構振動控制系統以降低結構受強烈外力作用下之動態反
應,已引起國內外學術界與工程界的研究興趣。無論新舊結構欲裝設振動
控制裝置,均需了解原主結構之動態特性,方能進行振動控制裝置之最佳
設計。而實際結構由於質心與剛心位置不一致,其振動反應具有扭轉耦合
效應,欲了解此類結構之真實動態特性,利用實際結構振動量測進行系統
參數識別是最佳且最可行的途徑,故系統識別配合振動控制乃十分重要。
本文之第一部分為探討應用地震反應記錄之扭轉耦合結構模態參數識別,
應用一套結構系統識別技巧,不需要量測結構系統之真實受力,僅依據部
份加速度反應量測即可計算出扭轉耦合結構之相關模態參數。首先,應用
經考慮量測反應相關性而修正之隨機遞減法化簡量測反應以萃取該量測位
置之自由振動反應,進而依亞伯拉罕時域模態參數識別法計算結構之模態
頻率、阻尼比以及振態。當量測不足時,依據本文發展之振態插值法可求
得未量測位址之振態值以形成完整振態並進而估算結構各位址之振動反應
。文中針對五層扭轉耦合結構受1940 El Centro雙向地震作用下,依數值
模擬驗證本文發展之系統識別技巧的準確性。並以1994年6月5日南澳地震
(規模為6.2)安裝於宜蘭農工新建教學大樓之實測結構加速度反應記錄
進行系統識別,以識別參數預測結構之振動反應,依此結果比較証明本文
之理論與識別方法確可應用於實際結構之系統參數識別。 本文之第二部
分為探討扭轉耦合結構受雙向地震力作用下,被動調諧質量阻尼器(PTMD)
降低結構反應的效用。文中以扭轉耦合結構裝設PTMD前後自由度均方位移
極小化的方式設計PTMD的參數,並討論PTMD之擺設方向、其在樓房結構立
面與平面的最佳位置。同時,本文亦探討PTMD的擺設平面位置及因其設計
參數所造成的非調諧效應對控制結構反應的影響。最後,以數個不同典型
之五層扭轉耦合樓房結構分別受1940及1979 El Centro之雙向地震作用下
之數值模擬,以驗證最佳設計之PTMD確實能有效降低主結構的動態反應。
In recent years, the use of Tuned Mass Damper (TMD) to reduce
the dynamicresponses of structures under strong environmental
loadings has become an area of considerable research interest.
To design an optimum TMD requires the prior knowledge of modal
properties of the controlled structure. For a real building
structure, the lateral and torsional motions are coupled if the
centers of mass and resistance do not coincide. Therefore, it is
of great importance and necessity that system identification of
torsionally-coupled buildings using real response measurements
be carried out in conjunction with the design of optimal TMDs.
In the first part of this thesis, a system identification
technique is developed to evaluate the modal parameters of
irregular buildings, modeled astorsionally-coupled buildings,
based only on few floor earthquake response records. First, a
modified random decrement technique is employed to reduce the
floor response data to extract their corresponding free
vibration responses.Then, the Ibrahim time domain technique is
applied to calculate the structural modal frequencies, damping
ratios and mode shapes. Because of using only partial floor
response measurements, a mode shape interpolation method is also
developed to estimate the mode shape values for the locations
without measurement. The results through simulation data of a
five-story building under 1940 El Centro bi-directional
earthquakes and real records of a seven-story building in I-Lan,
Taiwan due to 1994 Nan-Au earthquake (M=6.2) show that the
proposed system identification technique is capable of
identifying structural dominant modal parameters and responses
accurately even with highly-coupled modes and high level of
noise contamination. In the second part, the vibration control
effectiveness of passive tuned mass dampers (PTMDs) to reduce
the seismic responses of torsionally-coupled buildings is
investigated. Some practical design issues such as the optimal
installed location of PTMDs are considered in this study. The
optimal PTMD''s system parameters are determined by minimizing
the mean-square displacement response ratio of controlled DOF
between the building with and without PTMDs. In addition, the
parametric studies about the PTMD''s planar position and effect
of detuning are investigated to realize their influence on the
response control efficacy. Finally, numerical results from
several typical multi-story torsionally-coupled buildings under
bi-directional components of 1940 and 1979 El Centro earthquakes
verify that the proposed optimal PTMDs are able to effectively
reduce the building responses.
Cover
ABSTRACT
TABLE OF CONTENTS
LIST OF TABLES
LIST OF FIGURES
1 INTRODUCTION
1.1 General Remarks
1.2 Literature Reviews
1.2.1 System Identification
1.2.2 Passive Tuned Mass Dampers
1.3 Features in This Study
1.4 Outlines
2 TORSIONALLY-COUPLED MULTI-STORY BUILDINGS
2.1 Mathematical Model
2.2 Characteristics of Torsionally-Coupled Buildings
3 SYSTEM IDENTIFICATION TECHNIQUES
3.1 Modified Random Decrement Method
3.2 Ibrahim Time domain Technique
3.3 Mode Shape Interpolation and Sensor allocation
3.4 Summary of System Identification Procedure
4 PASSIVE TUNED MASS DAMPERS DESIGN
4.1 Dynamic Equation of Building-PTMD Systems
4.2 Optimal System Parameters of One PTMD
4.3 Parametric Study for One PTMD Design
4.3.1 PTMD''s Installation Location
4.3.2 Effect of Detuning for PTMD''s Frequency and Damping Ratio
4.4 PTMD''s Numbers
4.5 Optimal Design of second PTMD
5 VERIFICATIONS OF SYSTEM IDENTIFICATION TECHNIQUES
5.1 Parametric Identification from Earthquake Response Record
5.2 The Teaching Building of I-Lan Institute of Agriculture and Technology in Taiwan: A Real Case Study
5.3 Concluding Remarks
6 NUMERICAL VERIFICATIONS OF OPTIMAL PASSIVE TUNED MASS DAMPERS
6.1 Square Buildings with Small Eccentricity
6.2 Square Buildings with Large Eccentricity
6.3 Long Buildings with kx/kt=4/3
6.4 Long Buildings with kx/ky=2
6.5 Opitmal PTMD Design Based On Identified Modal Parameters
6.6 Concluding Remarks
7 CONCLUSIONS
REFERENCES
APPENDIX A.Theoretical Derivation of Frequency Variation with Eccentricity for Torsionally-Coupled Buildings
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