1st Edition

Wavelet-Based Vibration Control of Smart Buildings and Bridges

By Hojjat Adeli, Hongjin Kim Copyright 2009
    238 Pages 90 B/W Illustrations
    by CRC Press

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    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.


    Motivation and Objectives

    Overview of the Book

    Vibration Control of Structures


    Passive Control of Structures

    Active Control of Structures

    Semi-Active Control of Structures

    Hybrid Control of Structures

    Concluding Remarks


    What is a Wavelet?

    Types of Wavelets

    Multiresolution Analysis

    Time-Frequency Signal Analysis of Earthquake Records


    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


    Equations of Motion

    LQR Control Algorithm

    LQG Control Algorithm

    Shortcomings of Classic Control Algorithms

    Filtered-x LMS algorithm


    Adaptive LMS Filter

    Filtered-x LMS Control Algorithm

    Application to Active Tuned Mass Damper

    Hybrid Feedback-LMS Algorithm


    Hybrid Feedback-LMS Algorithm

    Application to Active Tuned Mass Damper

    Concluding Remarks

    Wavelet-Hybrid Feedback LMS Algorithm for Robust Control of Structures


    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


    Analytical Model

    Optimal Control of 3D Irregular Buildings Equipped with Hybrid Damper-TLCD System

    Vibration Control of Highrise Buildings under wind Loading


    76-Story Benchmark Building

    Semi Active TLCD System

    Hybrid Damper-TLCD System

    Stochastic Wind Loads

    Vibration Control of Cable-Styed Bridges


    Cable-Stayed Bridge Benchmark Problem

    Numerical Simulation

    Sensitivity Analysis

    Concluding Remarks

    Conclusion – Toward a New Generation of Smart Building and Bridge Structures




    Adeli, Hojjat; Kim, Hongjin