Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Recent Development and Application of Recent Development and Application of Structural Control and Health monitoringStructural Control and Health monitoring

Aiqun LiAiqun LiSchool of Civil EngineeringSchool of Civil Engineering

Southeast UniversitySoutheast UniversityJune 2008June 2008

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

IntroductionIntroduction Viscoelastic DamperViscoelastic Damper Viscous Fluid DamperViscous Fluid Damper Tuned Liquid Damper / Tuned Tuned Liquid Damper / Tuned MassMass Damper / Active Mass DamperDamper / Active Mass Damper Challenges and Future DirectionsChallenges and Future Directions

CONTENTSCONTENTS

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Characteristics of Structural Control

Real-time Control

Huge Weight

Low Frequency Economical

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Viscous Fluid DamperViscous Fluid Damper

Loop of Damping Force and Displacement

Different kinds of Fluid Dampers

F80510

-16000

-12000

-8000

-4000

0

4000

8000

12000

16000

-12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12

Displacement(mm)

Forc

e(N

)

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Application in Civil EngineeringApplication in Civil EngineeringApplied in Vibration Reducing of Buildings, High-rise Buildings, Super High-rise Buildings ， Towers ， Long-span Structures and Bridges, etc.

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

ContentsContents

Introduction Structural health monitoring system Baseline finite element modeling Structural damage alarming Data Analysis of GPS Monitoring System Data Analysis of Wind Monitoring System Data Analysis of Stress Monitoring System

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

IntroductionIntroduction

Determination of damage existence

Determination of damage’s geometric location

Quantification of damage severity

Prediction of remaining life of the structure

Objective of structural health monitoring

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Structural health monitoring and condition assessment system for Runyang Yangtse River Bridge

150T超大型车辆过桥监测 ( 2005.7.20) 台风“麦莎”期间监测数据分析（ 2005.8.7)

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Wavelet packet energy spectrum of structural response

Multi-scale decomposition of structural response

Multi-scale decomposition of structural system

t

0

),1()1(

),1()1()1,1(

kii

kiikiii

iii

VV

VVV

FB

xAx

12,1,0,, iiiij

ji fffff

2

,, jijiE f

),()( ),()()1,(kNNkNNkN

FBxAx

Structural damage alarmingStructural damage alarmingStrategy and methodology

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Structural damage alarming method and system based on the energy variations of structural ambient vibration responses decomposed using wavelet packet analysis

WPES Calculation Method

小波函数的选择

最优小波包基的选择

损伤特征频带的选择

WPES Index

损伤预警指标的构造

损伤敏感性比较分析

噪声鲁棒性比较分析 0

10

20

30

40

50

0 2 4 6 8 10 12 14 16 18 20 22小时

损伤

预警

指标

（%

）

0 50 100 150 200 25010

-4

10-2

100

102

0 50 100 150 200 25010

-3

10-2

10-1

100

101

102

Aiqun Li, Professor, Ph.D, School of Civil Engineering, Southeast University,CHINA

Thanks for your attention!Thanks for your attention!