Experimental Study on Building Mass Damper Using Optimum Dynamic Response Control Algorithm
Date Issued
2015
Date
2015
Author(s)
Kuo, Shih-Pu
Abstract
Isolation system have be applied on many buildings recently, especially the mid-story isolation system is generally applied because of its constructability. But the response of substructure may be enlarged due to the flexibility and the contribution of the higher modes. Besides, tuned mass damper (TMD) system has been recognized as an effective energy absorbing device to reduce the undesirable vibrations of the attached vibrating system subjected to harmonic excitations. Therefore, the concept of building mass damper (BMD) design is to combine the tuned mass damper system and mid-story isolated design to control the seismic response of both substructure and superstructure. In BMD design, the superstructure above the isolation layer can serve as a tuned absorber mass whose stiffness and damping are provided by the isolation system composed of elastomeric bearings and additional dampers, as the advantages of conventional tuned mass damper and mid-story isolation systems can be integrated. In this research, a simplified three-lumped-mass structural model, simulating superstructure, control layer and substructure, represents a building with the BMD system. The objective function for the BMD design is determined by the dynamic response control of both the substructure and superstructure. Considering appropriate system parameters such as mass ratio and damping ratios, the optimum parameters for the BMD system are derived. A series of numerical analysis are performed to determine the optimum mass ratio. Then by applying the shaking table test, some system identification methods were performed to acquire the modal information such as frequency, damping ratio and modal participation mass ratio of test specimens. Accordingly some numerical models with the test results can be established and the numerical analysis and experimental results can be compared. Based on the research results, the effectiveness of the optimum BMD design on seismic protection of buildings is verified. Finally, compare the pros and cons of the seismic response between BMD system and other designs in different structural periods.
Subjects
Mid-story isolation system
Tuned mass damper
Building mass damper
Objective function
Numerical analysis
Shaking table test
Type
thesis
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