Structural Health Monitioring_ppt

STRUCTURALH

EALTH

MONITORING

(SHM)

(SHM)

dr.ing.N

AGY

GYRGYTams

lecturer

2012

v1

REFERENCES

SHM

http://wwwshmlivecom/

SHM

http://www.shmlive.com/

SAMCO

http://www.samco.org/network/index.htm

ISISandSAMCOEducationalModule5:AnIntroductiontoStructuralHealth

Monitoring

Monitoring

INTRODUCTION

Why

we

need

SHM?

Population

dependson

anextensive

infrastructure

system

roads

highways

highways

buildings

etc

The

infrastructure

system

hassuffered

neglect

dti

tideterioration

lack

offunding

GlobalInfrastructure

Crisis

ISIS

Canada E

ducational M

odule

5

GlobalIn

frastructure

Crisis

INTRODUCTION

Why

we

need

SHM?

Factors

leadingto

the

extensive

degradation

Factor1

Unsatisfactoryinspectionandmonitoringof

Factor1

Unsatisfactory

inspection

and

monitoringof

existingin

frastructure

Consequences:

Problemsbecome

apparentonly

when

structuresare

indire

need

ofrepair

Result

Repair

costsb

ecome

comparable

to

replacementcosts

ISIS

Canada E

ducational M

odule

5

INTRODUCTION

Why

we

need

SHM?

Factors

leadingto

the

extensive

degradation

Factor2

Corrosionofconventionalsteel

Factor2

Corrosion

ofconventional

steel

reinforcementwithin

concrete

Consequences:

Expansion

ofste

elleadsto

crackingand

spalling,

furtherdeterioration

Result

Reductionsin

strength

and

serviceability,

resulting

inne

ed

forre

pair

and/orre

placement

ISIS

Canada E

ducational M

odule

5

INTRODUCTION

Why

we

need

SHM?

Factors

leadingto

the

extensive

degradation

Factor3

Increasedloadsordesignrequirementsover

Factor3

Increased

loadsordesign

requirements

over

time

(e.g.heaviertrucks)

Consequences:

Increased

deterioration

due

tooverloadsor

tostructuralinadequaciesresultingfrom

design

Result

Structuresd

eemed

unsafe

orun

serviceable

and

strengthening

orre

placementis

required

ISIS

Canada E

ducational M

odule

5

INTRODUCTION

Why

we

need

SHM?

Factors

leadingto

the

extensive

degradation

Factor4

Overalldeteriorationand/oraging

Factor4

Overalldeterioration

and/oraging

Consequences:

Variousdetrimentaleffectson

structural

performance,both

safety

and

serviceability

Result

Need

forre

pair,re

habilitation,

strengthening

orre

placement

ISIS

Canada E

ducational M

odule

5

INTRODUCTION

Materials

&Technologies

SHM

FRP

++

New

and

innovative

materialsand

monitoring

tools

that

prolong

the

service

livesofstructureswhile

decreasingcosts

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

Assessingthe

inservice

perform

anceofstructuresusinga

variety

ofm

easurementte

chniques

Leadingto

smartstructures

EXTERNAL

DISTURBANCES

STRUCTURE

RESPONSE

SENSORS

ACTUATORS

CONTROLLER

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

Inspection

On

site

non

destructive

examination

toestablish

the

presentcondition

ofthe

structure

p

Load

testing

Test

ofthe

structure

orpart

thereofbylo

adingto

ealateitsbehaiororpropertiesortopredictits

evaluate

itsbehaviororproperties,

orto

predictits

load

bearingcapacity

Monitoring

Frequentorcontinuous,

normally

longterm,

observation

ormeasurementofstructuralco

nditionsor

actions

Bj

rnT

ljs

ten

WHAT

ISSH

M?

Why

monitoring?

follow

upphysical

phenomenon

checkuotthecalculationmodels

Bj

rnT

ljs

ten

check

uotthe

calculation

models

assessmentofstructures

verification

ofthe

strengtheningeffects

WHAT

ISSH

M?

Whatis

SHM

becoming

popular?

Emerging

use

ofSH

Mis

aresult

of:

1.The

increasingneed

for

Monitoringofinnovative

designsand

materials

Bettermanagementofexistingstructures

Bettermanagementofexistingstructures

2.The

ongoingdevelopmentof

N(

Fib

OtiS

(FOS)

tNew

sensors

(e.g.FiberOpticSensors

(FOS),smart

materialsetc.)

Dataacquisition

systems(D

AS)

Wireless

and

internette

chnologies

Datatransmission,co

llection,archivingand

retrievalsystems

Dataprocessingandeventidentification

Dataprocessingand

eventidentification

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

Body

Analogy

dl

MedicalD

octor

SHM

Engineer

M

onitorp

atientsh

ealth

Usesmedicalequipment

M

onitorcondition

ofstructures

Usessensorsto

check

overall

Us

esm

edicalequipment

toch

eck

overall

health

Pr

escribesc

orrective

dii

ifi

d

Us

ess

ensors

toch

eck

overall

structuralh

ealth

If

excessive

stress

or

df

titit

timedicine

ifrequired

deform

ation,co

rrect

situation

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

System

Components

Acquisition

ofDa

ta

Communication

ofDa

ta

IntelligentProcessing

IntelligentP

rocessing

http://www.smartstructuresin

c.com

Storage

ofPr

ocessed

Data

Retrievalo

fData

Diagnostics

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

SHM

Categories

StaticF

ield

Testing:

Behaviourtests

Dynamic

Field

Testing:

Stress

history

tests

Behaviourtests

Diagnostic

tests

Prooftests

yAmbientvibration

tests

Dyn.Lo

adAllowance

(DLA)tests

Pullback(anchoredcables)tests

Pullback(anchored

cables)

tests

Periodic

Monitoring:

Fieldtesting

ContinuousM

onitoring:

Activemonitoring

Field

testing

Teststo

determine

changesin

structure

Active

monitoring

Passive

monitoring

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

Classification

ofSH

MSystems

LevelIV

Detectpresence

locationseverityandconsequencesofdamage

Detect

presence,location,severity

and

consequencesofdamage

LevelIII

LevelII

IDetect

presence,location

and

severity

ofdamage

lLevelII

Detect

presence

and

location

ofdamage

LevelI

Detectpresenceofdamage

ISIS

Canada E

ducational M

odule

5

Detect

presence

ofdamage

WHAT

ISSH

M?

Classification

ofSH

MSystems

ISIS

Canada E

ducational M

odule

5

WHAT

ISSH

M?

Advantageso

fSHM

Advantageso

fSHM

Increased

understandingofin

situ

structuralbehaviour

g

Early

damage

detection

Assurancesofstructuralstrengthandserviceability

Assurancesofstructuralstrength

and

serviceability

Decreased

down

time

forinspection

and

repair

/Developmentofrational

maintenance

/managementstrategies

Increased

effectiveness

inallocation

ofscarce

resources

Enablesand

encouragesuse

ofnew

and

innovative

materials

ISIS

Canada E

ducational M

odule

5

METHODOLO

GY

Ideal

SHMsystem:

1.Information

ondemand

abouta

structures

health

2.Warnings

regardinganydamage

detected

Developmentofa

SHMsystem

involvesutilizing

informationfrommanydifferentengineeringdisciplines

information

from

manydifferentengineeringdisciplines

Computers

M

aterials

Ci

iCommuni