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.
Table of Contents:
Introduction
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Motivation and Objectives
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Overview of the Book
Vibration Control of Structures
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Introduction
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Passive Control of Structures
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Active Control of Structures
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Semi-Active Control of Structures
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Hybrid Control of Structures
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Concluding Remarks
Wavelets
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What is a Wavelet?
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Types of Wavelets
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Multiresolution Analysis
Time-Frequency Signal Analysis of Earthquake Records
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Introduction
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Continuous Wavelet Transform (CWT)
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Ground Motions as a Sequence of Penny-Shaped Ruptures at Different Locations along the Fault Line
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Selection of the Basis Wavelet Function
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Representing Earthquake Acceleration Signals by Wavelet Saclograms
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Concluding Remarks
Feedback Control Algorithms
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Introduction
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Equations of Motion
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LQR Control Algorithm
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LQG Control Algorithm
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Shortcomings of Classic Control Algorithms
Filtered-x LMS algorithm
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Introduction
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Adaptive LMS Filter
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Filtered-x LMS Control Algorithm
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Application to Active Tuned Mass Damper
Hybrid Feedback-LMS Algorithm
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Introduction
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Hybrid Feedback-LMS Algorithm
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Application to Active Tuned Mass Damper
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Concluding Remarks
Wavelet-Hybrid Feedback LMS Algorithm for Robust Control of Structures
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Introduction
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Wavelet Transform as an Effective Filter for Control Problems
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Wavelet-Hybrid Feedback LMS Control Algorithm
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Concluding Remarks
Hybrid Control of 3D Irregular Buildings under Seismic Excitation
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Introduction
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Analytical Model
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Optimal Control of 3D Irregular Buildings Equipped with Hybrid Damper-TLCD System
Vibration Control of Highrise Buildings under wind Loading
Introduction
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76-Story Benchmark Building
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Semi Active TLCD System
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Hybrid Damper-TLCD System
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Stochastic Wind Loads
Vibration Control of Cable-Styed Bridges
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Introduction
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Cable-Stayed Bridge Benchmark Problem
Numerical Simulation
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Sensitivity Analysis
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Concluding Remarks
Conclusion – Toward a New Generation of Smart Building and Bridge Structures
References
Index
