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研究生:Valeriy Shaev
研究生(外文):Valeriy Shaev
論文名稱:Feasibility Study of Structures with Building Mass Damper
論文名稱(外文):Feasibility Study of Structures with Building Mass Damper
指導教授:黃震興黃震興引用關係
指導教授(外文):Jenn- Shin Hwang
口試委員:黃震興
口試日期:2012-07-23
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
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:2012
畢業學年度:100
語文別:英文
論文頁數:91
中文關鍵詞:building mass damperseismic isolation
外文關鍵詞:building mass damperseismic isolation
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This study aims to discuss the feasibility of building mass damper (BMD) design in seismic control of building structures. In the BMD system, a floor or even a multi-story structure serves as a tuned absorber mass whose stiffness and damping can be respectively provided by elastomeric bearings and additional dampers. Therefore, the BMD design can essentially solve the inherent size limitation of the conventional tuned mass damper (TMD) design in which the additional tuned absorber mass is much smaller than the main structure mass. Two objective functions for TMD design, modal characteristic and dynamic response control methods respectively proposed by Sadek and Tsai, are introduced and used for the optimal design of BMD in this study. An analysis example of a 9-story structural frame with 3 bays shows that the adoption of BMD design can acceptably control the seismic responses of the main structure, about with a reduction of 30% to 50% in the acceleration and displacement responses compared to the bare frame. However, it is also disclosed that the larger the tuned absorber mass is, both the higher damping demand for BMD design and the less reduction of dynamic responses will be. In the future study, a more realistic three-dimensional structural model with a larger tuned absorber mass (e.g. a multi-story structure) will be considered to investigate the feasibility of BMD design in practice, and to discuss the effectiveness of BMD design in seismic protection of both the main structure and tuned mass structure.
This study aims to discuss the feasibility of building mass damper (BMD) design in seismic control of building structures. In the BMD system, a floor or even a multi-story structure serves as a tuned absorber mass whose stiffness and damping can be respectively provided by elastomeric bearings and additional dampers. Therefore, the BMD design can essentially solve the inherent size limitation of the conventional tuned mass damper (TMD) design in which the additional tuned absorber mass is much smaller than the main structure mass. Two objective functions for TMD design, modal characteristic and dynamic response control methods respectively proposed by Sadek and Tsai, are introduced and used for the optimal design of BMD in this study. An analysis example of a 9-story structural frame with 3 bays shows that the adoption of BMD design can acceptably control the seismic responses of the main structure, about with a reduction of 30% to 50% in the acceleration and displacement responses compared to the bare frame. However, it is also disclosed that the larger the tuned absorber mass is, both the higher damping demand for BMD design and the less reduction of dynamic responses will be. In the future study, a more realistic three-dimensional structural model with a larger tuned absorber mass (e.g. a multi-story structure) will be considered to investigate the feasibility of BMD design in practice, and to discuss the effectiveness of BMD design in seismic protection of both the main structure and tuned mass structure.
ACKNOWLEDGEMENT i
ABSTRACT ii
TABLE OF CONTENTS iii
TABLES v
FIGURES vi
CHAPTER 1 INTRODUCTION 1
1.1. Background 3
1.2. Literature Review 5
1.3. Current Applications of Passive Mass Dampers 8
1.4. Motivation of This Study 11
CHAPTER 2 OBJECTIVE FUNCTIONS FOR TMD DESIGN 12
2.1. Parameters of Interests 12
2.2. Modal Characteristic Control in TMD Design. (Sadek’s Theory) 13
2.2.1. SDOF System for Primary Structure 13
2.2.2. 3DOF System for Primary Structure with TMD 17
2.2.3. MDOF System for Primary Structure 21
2.3. Dynamic Response Control in TMD Design. (Tsai’s Theory) 23
2.3.1. Fixed-Displacement Amplitude Excitations 23
2.3.1.1. Searching Optimum Parameters for Undamped Systems 28
2.3.1.2. Searching Optimum Parameters for Damped Systems 32
2.3.2. Fixed-Acceleration Amplitude Excitations 37
CHAPTER 3 ANALYTICAL MODEL FOR BMD DESIGN 40
3.1. Design of Structural Model in SAP2000 40
3.1.1. Design Parameters of Main Structure 45
3.1.2. Optimum Design Parameters of BMD 51
3.1.2.1. Introduction of Viscous Dampers 51
3.1.2.2. Introduction of Rubber Bearings 54
3.1.3. Design of BMD as a Top Floor 55
3.1.3.1. Optimum BMD Parameters Referring to Sadek’s Theory 56
3.1.3.2. Optimum BMD Parameters Referring to Tsai’s Theory 59
3.2. Comparison of Analysis Results by the Two Theories 61
CHAPTER 4 CONCLUSIONS AND FURTHER SCOPE OF THIS STUDY 88
REFERENCES 90
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