Feasibility Study on Seismic Performance of Structures with Building Mass Damper Systems
Date Issued
2014
Date
2014
Author(s)
Chuang, Wei-Chu
Abstract
This thesis studies the seismic performance of the building mass damper (BMD) system, and address a preliminary optimum design methods for the BMD system to reduce the dynamic responses of both the building mass absorber and primary structure. Tuned mass damper (TMD) system has been recognized as an effective energy absorbing device to reduce the undesirable vibrations of the attached vibrating system (or primary system) subjected to harmonic excitations. Various objective functions for determining the optimum design parameters of a TMD system have also been developed and discussed based on the concept of generating a significant phase lag attributed to resonance between the primary structure and TMD system.
To overcome the concern of limited response reduction due to insufficient tuned mass in the conventional TMD design, the design method and seismic performance of the BMD system are analytically and numerically discussed in this thesis. In the BMD system, a part of structural mass, instead of additional mass like the conventional TMD system, is intended to be an energy absorber. A simplified three-lumped-mass structural model, in which three lumped masses are respectively assigned to the building mass absorber, control layer and primary structure, is assumed to represent a building with the BMD system. The objective function for the optimum BMD (or OBMD) design is determined based on the dynamic response control of both the primary structure and building mass absorber. Considering appropriate system parameters such as mass ratios and inherent damping ratios in the simplified structural model, the optimum parameters for the OBMD system can be derived. First, series of numerical studies for a 8-story scale-down building model are performed to determine a preliminary optimum mass ratio between the building mass absorber and primary structure. Then, addition reasonable damping ratio is assumed to apply on the primary structure. The seismic responses of the OBMD system are thoroughly investigated and the practicability and effectiveness of the OBMD system for seismic design are also verified.
Subjects
調諧質量阻尼器
中間樓層隔震
自體調諧質量阻尼器
設計方法
目標函數
數值分析
Type
thesis
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