SemiActive Structural Control: A Low Cost Fix for An Infrastructure at Risk

by C. C. Kuo, Univ of Oklahoma,
H. Wu, Univ of Oklahoma,
L. Liu, Univ of Oklahoma,
R.L. Sack, (F.ASCE), Univ of Oklahoma,
A. Ebrahimpour, (M.ASCE), Univ of Oklahoma,
W. N. Patten, (M.ASCE), Univ of Oklahoma,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

There is increasing societal pressure on the engineering profession to develop cost effective methods to extend the service life of the civil infrastructure. While the degradation of the infrastructure is occurring in various ways, structures and life lines (including roads) that are subjected to repeated and/or excessive vibration are especially at risk. Existing bridges that are subjected to repeated overloads and buildings that may fail if seismically excited are prime examples of the types of civil works that could benefit if retrofitted with vibration suppression equipment. This paper describes a workable design for a hydraulic SA structural control system. The physics that govern the hardware are discussed first and a seismic design application is then described. The paper then presents the results of a series of simulations that compare the performance of some of the candidate control strategies that could be employed to regulate the SA control system. The paper closes with recommendations for further work in this emerging area of technology.



Subject Headings: Control systems | Hydraulic structures | Risk management | Earthquake resistant structures | Structural control | Engineering profession | Structural systems | Bridge design

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