Title

Building Hazard Mitigation with Piezoelectric Friction Dampers

Abstract

Semi-active piezoelectric friction dampers have been recently introduced to reduce the peak responses of buildings. They are regulated in real time with applied voltages according to a simple and effective control algorithm that combines the viscous and nonlinear Reid damping mechanisms. This chapter addresses some performance-related issues such as the stick and sliding features of a friction damper, optimum ratio of Reid and viscous damping in the control algorithm, performance comparison with Coulomb dampers, and optimal placement of friction dampers in a multistorey building. Numerical simulations of a single and a twenty-storey building indicate that Coulomb dampers are effective when the external excitation on the building is known a prioror. Semi-active friction dampers, however, are effective in response reduction of a building subjected to excitations of various intensities. They have been applied to effectively mitigate the responses of buildings under both near-fault and far-field ground motions. The optimum ratio of control gain factors for the Reid and viscous damping is equal to 2/π times the excitation frequency. A sequential suboptimal procedure for damper placement is developed for practical applications. Due to their adaptability to external disturbances, semi-active dampers can greatly enhance the multiobjective performance of buildings under multilevel excitations and will play an important role in performance-based engineering.

Meeting Name

International Conference on Advances in Building Technology (2002: Dec. 4-6, Hong Kong)

Department(s)

Civil, Architectural and Environmental Engineering

International Standard Book Number (ISBN)

978-0080526638; 978-0080441009

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2002 Elsevier, All rights reserved.

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