Citation
Wang, Luo-Jia (1997) Active interaction control for civil structures. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/zsgm-ve62. https://resolver.caltech.edu/CaltechThesis:03142014-105804007
Abstract
This thesis presents a civil engineering approach to active control for civil structures. The proposed control technique, termed Active Interaction Control (AIC), utilizes dynamic interactions between different structures, or components of the same structure, to reduce the resonance response of the controlled or primary structure under earthquake excitations. The primary control objective of AIC is to minimize the maximum story drift of the primary structure. This is accomplished by timing the controlled interactions so as to withdraw the maximum possible vibrational energy from the primary structure to an auxiliary structure, where the energy is stored and eventually dissipated as the external excitation decreases. One of the important advantages of AIC over most conventional active control approaches is the very low external power required.
In this thesis, the AIC concept is introduced and a new AIC algorithm, termed Optimal Connection Strategy (OCS) algorithm, is proposed. The efficiency of the OCS algorithm is demonstrated and compared with two previously existing AIC algorithms, the Active Interface Damping (AID) and Active Variable Stiffness (AVS) algorithms, through idealized examples and numerical simulations of Single- and Multi-Degree-of Freedom systems under earthquake excitations. It is found that the OCS algorithm is capable of significantly reducing the story drift response of the primary structure. The effects of the mass, damping, and stiffness of the auxiliary structure on the system performance are investigated in parametric studies. Practical issues such as the sampling interval and time delay are also examined. A simple but effective predictive time delay compensation scheme is developed.
Item Type: | Thesis (Dissertation (Ph.D.)) | ||||||||||||||
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Subject Keywords: | civil structures ; active control | ||||||||||||||
Degree Grantor: | California Institute of Technology | ||||||||||||||
Division: | Engineering and Applied Science | ||||||||||||||
Major Option: | Civil Engineering | ||||||||||||||
Thesis Availability: | Public (worldwide access) | ||||||||||||||
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Defense Date: | 16 May 1997 | ||||||||||||||
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Record Number: | CaltechThesis:03142014-105804007 | ||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechThesis:03142014-105804007 | ||||||||||||||
DOI: | 10.7907/zsgm-ve62 | ||||||||||||||
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Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||
ID Code: | 8135 | ||||||||||||||
Collection: | CaltechTHESIS | ||||||||||||||
Deposited By: | Kathy Johnson | ||||||||||||||
Deposited On: | 18 Mar 2014 23:07 | ||||||||||||||
Last Modified: | 16 Apr 2021 23:18 |
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