1st Edition
Wavelet-Based Vibration Control of Smart Buildings and Bridges
Earthquakes, bridge collapses, and other natural disasters have dominated news coverage in the last few years. Aging infrastructure needs to be rehabilitated and new infrastructure needs to be designed differently. Presenting a highly innovative, modern approach verging on the futuristic, Wavelet-Based Vibration Control of Smart Buildings and Bridges discusses a new generation of building and bridge structures that not only withstands [generation is singular] the destructive effects of nature but is also impact and explosion resistant.
Based on the groundbreaking work of Hojit Adeli, the book introduces the new mathematical concept of wavelets into the field of structural vibration control. It presents a new control algorithm for robust control of smart civil structures subjected to destructive environmental forces, such as earthquakes and wind. It then discusses a new hybrid control system, the hybrid tuned liquid column damper (TLCD) system. The new hybrid control system, which combines passive and semi-active control systems, is intended to achieve increased reliability and maximum operability of the control system during power failure and to eliminate the need for a larger power requirement.
The great majority of papers published in this area of active structural vibration control deal with small or academic problems. The models in this book have been tested and their effectiveness evaluated extensively on small problems for the sake of comparison with other methods and results reported in the literature. The authors go one step further and apply them to realistic and large building and bridge structures to demonstrate the applicability of the new smart technology to large real-world civil structures. Balancing coverage between theory and application, the book demonstrates the benefits of the new smart technology in the design of structures that are safer and more sustainable.
Introduction
Motivation and Objectives
Overview of the Book
Vibration Control of Structures
Introduction
Passive Control of Structures
Active Control of Structures
Semi-Active Control of Structures
Hybrid Control of Structures
Concluding Remarks
Wavelets
What is a Wavelet?
Types of Wavelets
Multiresolution Analysis
Time-Frequency Signal Analysis of Earthquake Records
Introduction
Continuous Wavelet Transform (CWT)
Ground Motions as a Sequence of Penny-Shaped Ruptures at Different Locations along the Fault Line
Selection of the Basis Wavelet Function
Representing Earthquake Acceleration Signals by Wavelet Saclograms
Concluding Remarks
Feedback Control Algorithms
Introduction
Equations of Motion
LQR Control Algorithm
LQG Control Algorithm
Shortcomings of Classic Control Algorithms
Filtered-x LMS algorithm
Introduction
Adaptive LMS Filter
Filtered-x LMS Control Algorithm
Application to Active Tuned Mass Damper
Hybrid Feedback-LMS Algorithm
Introduction
Hybrid Feedback-LMS Algorithm
Application to Active Tuned Mass Damper
Concluding Remarks
Wavelet-Hybrid Feedback LMS Algorithm for Robust Control of Structures
Introduction
Wavelet Transform as an Effective Filter for Control Problems
Wavelet-Hybrid Feedback LMS Control Algorithm
Concluding Remarks
Hybrid Control of 3D Irregular Buildings under Seismic Excitation
Introduction
Analytical Model
Optimal Control of 3D Irregular Buildings Equipped with Hybrid Damper-TLCD System
Vibration Control of Highrise Buildings under wind Loading
Introduction
76-Story Benchmark Building
Semi Active TLCD System
Hybrid Damper-TLCD System
Stochastic Wind Loads
Vibration Control of Cable-Styed Bridges
Introduction
Cable-Stayed Bridge Benchmark Problem
Numerical Simulation
Sensitivity Analysis
Concluding Remarks
Conclusion – Toward a New Generation of Smart Building and Bridge Structures
References
Index
Biography
Adeli, Hojjat; Kim, Hongjin